How to User Authentication with Node.js and MEAN stack

How to User Authentication with Node.js and MEAN stack

In this article, ✅ we’re going to look at managing user authentication in the MEAN stack. ✅We’ll use the most common MEAN architecture of having an Angular single-page app using a REST API built with Node, Express and MongoDB.

When thinking about user authentication, we need to tackle the following things:

  1. let a user register
  2. save their data, but never directly store their password
  3. let a returning user log in
  4. keep a logged in user’s session alive between page visits
  5. have some pages that can only been seen by logged in users
  6. change output to the screen depending on logged in status (e.g. a “login” button or a “my profile” button).

Before we dive into the code, let’s take a few minutes for a high-level look at how authentication is going to work in the MEAN stack.

The MEAN Stack Authentication Flow

So what does authentication look like in the MEAN stack?

Still keeping this at a high level, these are the components of the flow:

  • user data is stored in MongoDB, with the passwords hashed
  • CRUD functions are built in an Express API — Create (register), Read (login, get profile), Update, Delete
  • an Angular application calls the API and deals with the responses
  • the Express API generates a JSON Web Token (JWT, pronounced “Jot”) upon registration or login, and passes this to the Angular application
  • the Angular application stores the JWT in order to maintain the user’s session
  • the Angular application checks the validity of the JWT when displaying protected views
  • the Angular application passes the JWT back to Express when calling protected API routes.

JWTs are preferred over cookies for maintaining the session state in the browser. Cookies are better for maintaining state when using a server-side application.

The Example Application

The code for this article is available on GitHub. To run the application, you’ll need to have Node.js installed, along with MongoDB. (For instructions on how to install, please refer to Mongo’s official documentation — Windows, Linux, macOS).

The Angular App

To keep the example in this article simple, we’ll start with an Angular app with four pages:

  1. home page
  2. register page
  3. login page
  4. profile page

The pages are pretty basic and look like this to start with:

The profile page will only be accessible to authenticated users. All the files for the Angular app are in a folder inside the Angular CLI app called /client.

We’ll use the Angular CLI for building and running the local server. If you’re unfamiliar with the Angular CLI, refer to the Angular 2 Tutorial: Create a CRUD App with Angular CLI to get started.

The REST API

We’ll also start off with the skeleton of a REST API built with Node, Express and MongoDB, using Mongoose to manage the schemas. This API has three routes:

  1. /api/register (POST) — to handle new users registering
  2. /api/login (POST) — to handle returning users logging in
  3. /api/profile/USERID (GET) — to return profile details when given a USERID.

The code for the API is all held in another folder inside the Express app, called api. This holds the routes, controllers and model, and is organized like this:

At this starting point, each of the controllers simply responds with a confirmation, like this:

module.exports.register = function(req, res) {
  console.log("Registering user: " + req.body.email);
  res.status(200);
  res.json({
    "message" : "User registered: " + req.body.email
  });
};

Okay, let’s get on with the code, starting with the database.

Creating the MongoDB Data Schema with Mongoose

There’s a simple user schema defined in /api/models/users.js. It defines the need for an email address, a name, a hash and a salt. The hash and salt will be used instead of saving a password. The email is set to unique as we’ll use it for the login credentials. Here’s the schema:

var userSchema = new mongoose.Schema({
  email: {
    type: String,
    unique: true,
    required: true
  },
  name: {
    type: String,
    required: true
  },
  hash: String,
  salt: String
});

Managing the Password without Saving It

Saving user passwords is a big no-no. Should a hacker get a copy of your database, you want to make sure they can’t use it to log in to accounts. This is where the hash and salt come in.

The salt is a string of characters unique to each user. The hash is created by combining the password provided by the user and the salt, and then applying one-way encryption. As the hash can’t be decrypted, the only way to authenticate a user is to take the password, combine it with the salt and encrypt it again. If the output of this matches the hash, the password must have been correct.

To do the setting and the checking of the password, we can use Mongoose schema methods. These are essentially functions that you add to the schema. They’ll both make use of the Node.js crypto module.

At the top of the users.js model file, require crypto so that we can use it:

var crypto = require('crypto');

Nothing needs installing, as crypto ships as part of Node. Crypto itself has several methods; we’re interested in randomBytes to create the random salt and pbkdf2Sync to create the hash (there’s much more about Crypto in the Node.js API docs).

Setting the Password

To save the reference to the password, we can create a new method called setPassword on the userSchema schema that accepts a password parameter. The method will then use crypto.randomBytes to set the salt, and crypto.pbkdf2Sync to set the hash:

userSchema.methods.setPassword = function(password){
  this.salt = crypto.randomBytes(16).toString('hex');
  this.hash = crypto.pbkdf2Sync(password, this.salt, 1000, 64, 'sha512').toString('hex');
};

We’ll use this method when creating a user. Instead of saving the password to a password path, we’ll be able to pass it to the setPassword function to set the salt and hash paths in the user document.

Checking the Password

Checking the password is a similar process, but we already have the salt from the Mongoose model. This time we just want to encrypt the salt and the password and see if the output matches the stored hash.

Add another new method to the users.js model file, called validPassword:

userSchema.methods.validPassword = function(password) {
  var hash = crypto.pbkdf2Sync(password, this.salt, 1000, 64, 'sha512').toString('hex');
  return this.hash === hash;
};

Generating a JSON Web Token (JWT)

One more thing the Mongoose model needs to be able to do is generate a JWT, so that the API can send it out as a response. A Mongoose method is ideal here too, as it means we can keep the code in one place and call it whenever needed. We’ll need to call it when a user registers and when a user logs in.

To create the JWT, we’ll use a module called jsonwebtoken which needs to be installed in the application, so run this on the command line:

npm install jsonwebtoken --save

Then require this in the users.js model file:

var jwt = require('jsonwebtoken');

This module exposes a sign method that we can use to create a JWT, simply passing it the data we want to include in the token, plus a secret that the hashing algorithm will use. The data should be sent as a JavaScript object, and include an expiry date in an exp property.

Adding a generateJwt method to userSchema in order to return a JWT looks like this:

userSchema.methods.generateJwt = function() {
  var expiry = new Date();
  expiry.setDate(expiry.getDate() + 7);

  return jwt.sign({
    _id: this._id,
    email: this.email,
    name: this.name,
    exp: parseInt(expiry.getTime() / 1000),
  }, "MY_SECRET"); // DO NOT KEEP YOUR SECRET IN THE CODE!
};

Note: It’s important that your secret is kept safe: only the originating server should know what it is. It’s best practice to set the secret as an environment variable, and not have it in the source code, especially if your code is stored in version control somewhere.

That’s everything we need to do with the database.

Set Up Passport to Handle the Express Authentication

Passport is a Node module that simplifies the process of handling authentication in Express. It provides a common gateway to work with many different authentication “strategies”, such as logging in with Facebook, Twitter or Oauth. The strategy we’ll use is called “local”, as it uses a username and password stored locally.

To use Passport, first install it and the strategy, saving them in package.json:

npm install passport --save
npm install passport-local --save

Configure Passport

Inside the api folder, create a new folder config and create a file in there called passport.js. This is where we define the strategy.

Before defining the strategy, this file needs to require Passport, the strategy, Mongoose and the User model:

var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var mongoose = require('mongoose');
var User = mongoose.model('User');

For a local strategy, we essentially just need to write a Mongoose query on the User model. This query should find a user with the email address specified, and then call the validPassword method to see if the hashes match. Pretty simple.

There’s just one curiosity of Passport to deal with. Internally, the local strategy for Passport expects two pieces of data called username and password. However, we’re using email as our unique identifier, not username. This can be configured in an options object with a usernameField property in the strategy definition. After that, it’s over to the Mongoose query.

So all in, the strategy definition will look like this:

passport.use(new LocalStrategy({
    usernameField: 'email'
  },
  function(username, password, done) {
    User.findOne({ email: username }, function (err, user) {
      if (err) { return done(err); }
      // Return if user not found in database
      if (!user) {
        return done(null, false, {
          message: 'User not found'
        });
      }
      // Return if password is wrong
      if (!user.validPassword(password)) {
        return done(null, false, {
          message: 'Password is wrong'
        });
      }
      // If credentials are correct, return the user object
      return done(null, user);
    });
  }
));

Note how the validPassword schema method is called directly on the user instance.

Now Passport just needs to be added to the application. So in app.js we need to require the Passport module, require the Passport config and initialize Passport as middleware. The placement of all of these items inside app.js is quite important, as they need to fit into a certain sequence.

The Passport module should be required at the top of the file with the other general require statements:

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var passport = require('passport');

The config should be required after the model is required, as the config references the model.

require('./api/models/db');
require('./api/config/passport');

Finally, Passport should be initialized as Express middleware just before the API routes are added, as these routes are the first time that Passport will be used.

app.use(passport.initialize());
app.use('/api', routesApi);

We’ve now got the schema and Passport set up. Next, it’s time to put these to use in the routes and controllers of the API.

Configure API Endpoints

With the API we’ve got two things to do:

  1. make the controllers functional
  2. secure the /api/profile route so that only authenticated users can access it.

Code the Register and Login API Controllers

In the example app the register and login controllers are in /api/controllers/authentication.js. In order for the controllers to work, the file needs to require Passport, Mongoose and the user model:

var passport = require('passport');
var mongoose = require('mongoose');
var User = mongoose.model('User');

The Register API Controller

The register controller needs to do the following:

  1. take the data from the submitted form and create a new Mongoose model instance
  2. call the setPassword method we created earlier to add the salt and the hash to the instance
  3. save the instance as a record to the database
  4. generate a JWT
  5. send the JWT inside the JSON response.

In code, all of that looks like this:

module.exports.register = function(req, res) {
  var user = new User();

  user.name = req.body.name;
  user.email = req.body.email;

  user.setPassword(req.body.password);

  user.save(function(err) {
    var token;
    token = user.generateJwt();
    res.status(200);
    res.json({
      "token" : token
    });
  });
};

This makes use of the setPassword and generateJwt methods we created in the Mongoose schema definition. See how having that code in the schema makes this controller really easy to read and understand.

Don’t forget that, in reality, this code would have a number of error traps, validating form inputs and catching errors in the save function. They’re omitted here to highlight the main functionality of the code.

The Login API Controller

The login controller hands over pretty much all control to Passport, although you could (and should) add some validation beforehand to check that the required fields have been sent.

For Passport to do its magic and run the strategy defined in the config, we need to call the authenticate method as shown below. This method will call a callback with three possible parameters err, user and info. If user is defined, it can be used to generate a JWT to be returned to the browser:

module.exports.login = function(req, res) {

  passport.authenticate('local', function(err, user, info){
    var token;

    // If Passport throws/catches an error
    if (err) {
      res.status(404).json(err);
      return;
    }

    // If a user is found
    if(user){
      token = user.generateJwt();
      res.status(200);
      res.json({
        "token" : token
      });
    } else {
      // If user is not found
      res.status(401).json(info);
    }
  })(req, res);

};

Securing an API Route

The final thing to do in the back end is make sure that only authenticated users can access the /api/profile route. The way to validate a request is to ensure that the JWT sent with it is genuine, by using the secret again. This is why you should keep it a secret and not in the code.

Configuring the Route Authentication

First we need to install a piece of middleware called express-jwt:

npm install express-jwt --save

Then we need to require it and configure it in the file where the routes are defined. In the sample application, this is /api/routes/index.js. Configuration is a case of telling it the secret, and — optionally — the name of the property to create on the req object that will hold the JWT. We’ll be able to use this property inside the controller associated with the route. The default name for the property is user, but this is the name of an instance of our Mongoose User model, so we’ll set it to payload to avoid confusion:

var jwt = require('express-jwt');
var auth = jwt({
  secret: 'MY_SECRET',
  userProperty: 'payload'
});

Again, don’t keep the secret in the code!

Applying the Route Authentication

To apply this middleware, simply reference the function in the middle of the route to be protected, like this:

router.get('/profile', auth, ctrlProfile.profileRead);

If someone tries to access that route now without a valid JWT, the middleware will throw an error. To make sure our API plays nicely, catch this error and return a 401 response by adding the following into the error handlers section of the main app.js file:

// error handlers
// Catch unauthorised errors
app.use(function (err, req, res, next) {
  if (err.name === 'UnauthorizedError') {
    res.status(401);
    res.json({"message" : err.name + ": " + err.message});
  }
});

Using the Route Authentication

In this example, we only want people to be able to view their own profiles, so we get the user ID from the JWT and use it in a Mongoose query.

The controller for this route is in /api/controllers/profile.js. The entire contents of this file look like this:

var mongoose = require('mongoose');
var User = mongoose.model('User');

module.exports.profileRead = function(req, res) {

  // If no user ID exists in the JWT return a 401
  if (!req.payload._id) {
    res.status(401).json({
      "message" : "UnauthorizedError: private profile"
    });
  } else {
    // Otherwise continue
    User
      .findById(req.payload._id)
      .exec(function(err, user) {
        res.status(200).json(user);
      });
  }

};

Naturally, this should be fleshed out with some more error trapping — for example, if the user isn’t found — but this snippet is kept brief to demonstrate the key points of the approach.

That’s it for the back end. The database is configured, we have API endpoints for registering and logging in that generate and return a JWT, and also a protected route. On to the front end!

Create Angular Authentication Service

Most of the work in the front end can be put into an Angular service, creating methods to manage:

  • saving the JWT in local storage
  • reading the JWT from local storage
  • deleting the JWT from local storage
  • calling the register and login API endpoints
  • checking whether a user is currently logged in
  • getting the details of the logged-in user from the JWT.

We’ll need to create a new service called AuthenticationService. With the CLI, this can be done by running ng generate service authentication, and making sure it’s listed in the app module providers. In the example app, this is in the file /client/src/app/authentication.service.ts.

Local Storage: Saving, Reading and Deleting a JWT

To keep a user logged in between visits, we use localStorage in the browser to save the JWT. An alternative is to use sessionStorage, which will only keep the token during the current browser session.

First, we want to create a few interfaces to handle the data types. This is useful for type checking our application. The profile returns an object formatted as UserDetails, and the login and register endpoints expect a TokenPayload during the request and return a TokenResponse object:

export interface UserDetails {
  _id: string;
  email: string;
  name: string;
  exp: number;
  iat: number;
}

interface TokenResponse {
  token: string;
}

export interface TokenPayload {
  email: string;
  password: string;
  name?: string;
}

This service uses the HttpClient service from Angular to make HTTP requests to our server application (which we’ll use in a moment) and the Router service to navigate programmatically. We must inject them into our service constructor.

Then we define four methods that interact with the JWT token. We implement saveToken to handle storing the token into localStorage and onto the token property, a getToken method to retrieve the token from localStorage or from the token property, and a logout function that removes the JWT token from memory and redirects to the home page.

It’s important to note that this code doesn’t run if you’re using server-side rendering, because APIs like localStorage and window.atob aren’t available, and there are details about solutions to address server-side rendering in the Angular documentation.

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operators/map';
import { Router } from '@angular/router';

// Interfaces here

@Injectable()
export class AuthenticationService {
  private token: string;

  constructor(private http: HttpClient, private router: Router) {}

  private saveToken(token: string): void {
    localStorage.setItem('mean-token', token);
    this.token = token;
  }

  private getToken(): string {
    if (!this.token) {
      this.token = localStorage.getItem('mean-token');
    }
    return this.token;
  }

  public logout(): void {
    this.token = '';
    window.localStorage.removeItem('mean-token');
    this.router.navigateByUrl('/');
  }
}

Now let’s add a method to check for this token — and the validity of the token — to find out if the visitor is logged in.

Getting Data from a JWT

When we set the data for the JWT (in the generateJwt Mongoose method) we included the expiry date in an exp property. But if you look at a JWT, it seems to be a random string, like this following example:

eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJfaWQiOiI1NWQ0MjNjMTUxMzcxMmNkMzE3YTRkYTciLCJlbWFpbCI6InNpbW9uQGZ1bGxzdGFja3RyYWluaW5nLmNvbSIsIm5hbWUiOiJTaW1vbiBIb2xtZXMiLCJleHAiOjE0NDA1NzA5NDUsImlhdCI6MTQzOTk2NjE0NX0.jS50GlmolxLoKrA_24LDKaW3vNaY94Y9EqYAFvsTiLg

So how do you read a JWT?

A JWT is actually made up of three separate strings, separated by a dot .. These three parts are:

  1. Header — an encoded JSON object containing the type and the hashing algorithm used
  2. Payload — an encoded JSON object containing the data, the real body of the token
  3. Signature — an encrypted hash of the header and payload, using the “secret” set on the server.

It’s the second part we’re interested in here — the payload. Note that this is encoded rather than encrypted, meaning that we can decode it.

There’s a function called atob() that’s native to modern browsers, and which will decode a Base64 string like this.

So we need to get the second part of the token, decode it and parse it as JSON. Then we can check that the expiry date hasn’t passed.

At the end of it, the getUserDetails function should return an object of the UserDetails type or null, depending on whether a valid token is found or not. Put together, it looks like this:

public getUserDetails(): UserDetails {
  const token = this.getToken();
  let payload;
  if (token) {
    payload = token.split('.')[1];
    payload = window.atob(payload);
    return JSON.parse(payload);
  } else {
    return null;
  }
}

The user details that are provided include the information about the user’s name, email, and the expiration of the token, which we’ll use to check if the user session is valid.

Check Whether a User Is Logged In

Add a new method called isLoggedIn to the service. It uses the getUserDetails method to get the token details from the JWT token and checks the expiration hasn’t passed yet:

public isLoggedIn(): boolean {
  const user = this.getUserDetails();
  if (user) {
    return user.exp > Date.now() / 1000;
  } else {
    return false;
  }
}

If the token exists, the method will return if the user is logged in as a boolean value. Now we can construct our HTTP requests to load data, using the token for authorization.

Structuring the API Calls

To facilitate making API calls, add the request method to the AuthenticationService, which is able to construct and return the proper HTTP request observable depending on the specific type of request. It’s a private method, since it’s only used by this service, and exists just to reduce code duplication. This will use the Angular HttpClient service; remember to inject this into the AuthenticationService if it’s not already there:

private request(method: 'post'|'get', type: 'login'|'register'|'profile', user?: TokenPayload): Observable<any> {
  let base;

  if (method === 'post') {
    base = this.http.post(`/api/${type}`, user);
  } else {
    base = this.http.get(`/api/${type}`, { headers: { Authorization: `Bearer ${this.getToken()}` }});
  }

  const request = base.pipe(
    map((data: TokenResponse) => {
      if (data.token) {
        this.saveToken(data.token);
      }
      return data;
    })
  );

  return request;
}

It does require the map operator from RxJS in order to intercept and store the token in the service if it’s returned by an API login or register call. Now we can implement the public methods to call the API.

Calling the Register and Login API Endpoints

Just three methods to add. We’ll need an interface between the Angular app and the API, to call the login and register endpoints and save the returned token, or the profile endpoint to get the user details:

public register(user: TokenPayload): Observable<any> {
  return this.request('post', 'register', user);
}

public login(user: TokenPayload): Observable<any> {
  return this.request('post', 'login', user);
}

public profile(): Observable<any> {
  return this.request('get', 'profile');
}

Each method returns an observable that will handle the HTTP request for one of the API calls we need to make. That finalizes the service; now to tie everything together in the Angular app.

Apply Authentication to Angular App

We can use the AuthenticationService inside the Angular app in a number of ways to give the experience we’re after:

  1. wire up the register and sign-in forms
  2. update the navigation to reflect the user’s status
  3. only allow logged-in users access to the /profile route
  4. call the protected /api/profile API route.

Connect the Register and Login Controllers

We’ll begin by looking at the register and login forms.

The Register Page

The HTML for the registration form already exists and has NgModel directives attached to the fields, all bound to properties set on the credentials controller property. The form also has a (submit) event binding to handle the submission. In the example application, it’s in /client/src/app/register/register.component.html and looks like this:

<form (submit)="register()">
  <div class="form-group">
    <label for="name">Full name</label>
    <input type="text" class="form-control" name="name" placeholder="Enter your name" [(ngModel)]="credentials.name">
  </div>
  <div class="form-group">
    <label for="email">Email address</label>
    <input type="email" class="form-control" name="email" placeholder="Enter email" [(ngModel)]="credentials.email">
  </div>
  <div class="form-group">
    <label for="password">Password</label>
    <input type="password" class="form-control" name="password" placeholder="Password" [(ngModel)]="credentials.password">
  </div>
  <button type="submit" class="btn btn-default">Register!</button>
</form>

The first task in the controller is to ensure our AuthenticationService and the Router are injected and available through the constructor. Next, inside the register handler for the form submit, make a call to auth.register, passing it the credentials from the form.

The register method returns an observable, which we need to subscribe to in order to trigger the request. The observable will emit success or failure, and if someone has successfully registered, we’ll set the application to redirect them to the profile page or log the error in the console.

In the sample application, the controller is in /client/src/app/register/register.component.ts and looks like this:

import { Component } from '@angular/core';
import { AuthenticationService, TokenPayload } from '../authentication.service';
import { Router } from '@angular/router';

@Component({
  templateUrl: './register.component.html'
})
export class RegisterComponent {
  credentials: TokenPayload = {
    email: '',
    name: '',
    password: ''
  };

  constructor(private auth: AuthenticationService, private router: Router) {}

  register() {
    this.auth.register(this.credentials).subscribe(() => {
      this.router.navigateByUrl('/profile');
    }, (err) => {
      console.error(err);
    });
  }
}

The Login Page

The login page is very similar in nature to the register page, but in this form we don’t ask for the name, just email and password. In the sample application, it’s in /client/src/app/login/login.component.html and looks like this:

<form (submit)="login()">
  <div class="form-group">
    <label for="email">Email address</label>
    <input type="email" class="form-control" name="email" placeholder="Enter email" [(ngModel)]="credentials.email">
  </div>
  <div class="form-group">
    <label for="password">Password</label>
    <input type="password" class="form-control" name="password" placeholder="Password" [(ngModel)]="credentials.password">
  </div>
  <button type="submit" class="btn btn-default">Sign in!</button>
</form>

Once again, we have the form submit handler, and NgModel attributes for each of the inputs. In the controller, we want the same functionality as the register controller, but this time called the login method of the AuthenticationService.

In the sample application, the controller is in /client/src/app/login/login.controller.ts and look like this:

import { Component } from '@angular/core';
import { AuthenticationService, TokenPayload } from '../authentication.service';
import { Router } from '@angular/router';

@Component({
  templateUrl: './login.component.html'
})
export class LoginComponent {
  credentials: TokenPayload = {
    email: '',
    password: ''
  };

  constructor(private auth: AuthenticationService, private router: Router) {}

  login() {
    this.auth.login(this.credentials).subscribe(() => {
      this.router.navigateByUrl('/profile');
    }, (err) => {
      console.error(err);
    });
  }
}

Now users can register and sign in to the application. Note that, again, there should be more validation in the forms to ensure that all required fields are filled before submitting. These examples are kept to the bare minimum to highlight the main functionality.

Change Content Based on User Status

In the navigation, we want to show the Sign in link if a user isn’t logged in, and their username with a link to the profile page if they are logged in. The navbar is found in the App component.

First, we’ll look at the App component controller. We can inject the AuthenticationService into the component and call it directly in our template. In the sample app, the file is in /client/src/app/app.component.ts and looks like this:

import { Component } from '@angular/core';
import { AuthenticationService } from './authentication.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})
export class AppComponent {
  constructor(public auth: AuthenticationService) {}
}

That’s pretty simple, right? Now, in the associated template we can use auth.isLoggedIn() to determine whether to display the sign-in link or the profile link. To add the user’s name to the profile link, we can access the name property of auth.getUserDetails()?.name. Remember that this is getting the data from the JWT. The ?. operator is a special way to access a property on an object that may be undefined, without throwing an error.

In the sample app, the file is in /client/src/app/app.component.html and the updated part looks like this:

<ul class="nav navbar-nav navbar-right">
  <li *ngIf="!auth.isLoggedIn()"><a routerLink="/login">Sign in</a></li>
  <li *ngIf="auth.isLoggedIn()"><a routerLink="/profile">{{ auth.getUserDetails()?.name }}</a></li>
  <li *ngIf="auth.isLoggedIn()"><a (click)="auth.logout()">Logout</a></li>
</ul>

Protect a Route for Logged in Users Only

In this step, we’ll see how to make a route accessible only to logged-in users, by protecting the /profile path.

Angular allows you to define a route guard, which can run a check at several points of the routing life cycle to determine if the route can be loaded. We’ll use the CanActivate hook to tell Angular to load the profile route only if the user is logged in.

To do, this we need to create a route guard service, ng generate service auth-guard. It must implement the CanActivate interface, and the associated canActivate method. This method returns a boolean value from the AuthenticationService.isLoggedIn method (basically checks if the token is found, and still valid), and if the user is not valid also redirects them to the home page:

import { Injectable } from '@angular/core';
import { Router, CanActivate } from '@angular/router';
import { AuthenticationService } from './authentication.service';

@Injectable()
export class AuthGuardService implements CanActivate {

  constructor(private auth: AuthenticationService, private router: Router) {}

  canActivate() {
    if (!this.auth.isLoggedIn()) {
      this.router.navigateByUrl('/');
      return false;
    }
    return true;
  }
}

To enable this guard, we have to declare it on the route configuration. There’s a property called canActivate, which takes an array of services that should be called before activating the route. Ensure you also declare these services in the App NgModule’s providers array. The routes are defined in the App module, which contains the routes like you see here:

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'login', component: LoginComponent },
  { path: 'register', component: RegisterComponent },
  { path: 'profile', component: ProfileComponent, canActivate: [AuthGuardService] }
];

With that route guard in place, now if an unauthenticated user tries to visit the profile page, Angular will cancel the route change and redirect to the home page, thus protecting it from unauthenticated users.

Call a Protected API Route

The /api/profile route has been set up to check for a JWT in the request. Otherwise, it will return a 401 unauthorized error.

To pass the token to the API, it needs to be sent through as a header on the request, called Authorization. The following snippet shows the main data service function, and the format required to send the token. The AuthenticationService already handles this, but you can find this in /client/src/app/authentication.service.ts.

base = this.http.get(`/api/${type}`, { headers: { Authorization: `Bearer ${this.getToken()}` }});

Remember that the back-end code is validating that the token is genuine when the request is made, by using the secret known only to the issuing server.

To make use of this in the profile page, we just need to update the controller, in /client/src/app/profile/profile.component.ts in the sample app. This will populate a details property when the API returns some data, which should match the UserDetails interface.

import { Component } from '@angular/core';
import { AuthenticationService, UserDetails } from '../authentication.service';

@Component({
  templateUrl: './profile.component.html'
})
export class ProfileComponent {
  details: UserDetails;

  constructor(private auth: AuthenticationService) {}

  ngOnInit() {    
    this.auth.profile().subscribe(user => {
      this.details = user;
    }, (err) => {
      console.error(err);
    });
  }
}

Then, of course, it’s just a case of updating the bindings in the view (/client/src/app/profile/profile.component.html). Again, the ?. is a safety operator for binding properties that don’t exist on first render (since data has to load first).

<div class="form-horizontal">
  <div class="form-group">
    <label class="col-sm-3 control-label">Full name</label>
    <p class="form-control-static">{{ details?.name }}</p>
  </div>
  <div class="form-group">
    <label class="col-sm-3 control-label">Email</label>
    <p class="form-control-static">{{ details?.email }}</p>
  </div>
</div>

And here’s the final profile page, when logged in:

That’s how to manage authentication in the MEAN stack, from securing API routes and managing user details to working with JWTs and protecting routes. If you’ve implemented an authentication system like this in one of your own apps and have any tips, tricks, or advice, be sure to share them in the comments below!

This article has been republished from https://www.sitepoint.com

Further reading:

The complete JavaScript developer: MEAN stack zero-to-hero

Learn MEAN Stack By Building A ToDo App

MEAN Stack: Complete Hands-On Introduction

Building Applications with Mean Stack

How to Use Express.js, Node.js and MongoDB.js

How to Use Express.js, Node.js and MongoDB.js

In this post, I will show you how to use Express.js, Node.js and MongoDB.js. We will be creating a very simple Node application, that will allow users to input data that they want to store in a MongoDB database. It will also show all items that have been entered into the database.

In this post, I will show you how to use Express.js, Node.js and MongoDB.js. We will be creating a very simple Node application, that will allow users to input data that they want to store in a MongoDB database. It will also show all items that have been entered into the database.

Creating a Node Application

To get started I would recommend creating a new database that will contain our application. For this demo I am creating a directory called node-demo. After creating the directory you will need to change into that directory.

mkdir node-demo
cd node-demo

Once we are in the directory we will need to create an application and we can do this by running the command
npm init

This will ask you a series of questions. Here are the answers I gave to the prompts.

The first step is to create a file that will contain our code for our Node.js server.

touch app.js

In our app.js we are going to add the following code to build a very simple Node.js Application.

var express = require("express");
var app = express();
var port = 3000;
 
app.get("/", (req, res) => {
&nbsp;&nbsp;res.send("Hello World");
});
 
app.listen(port, () => {
  console.log("Server listening on port " + port);
});

What the code does is require the express.js application. It then creates app by calling express. We define our port to be 3000.

The app.use line will listen to requests from the browser and will return the text “Hello World” back to the browser.

The last line actually starts the server and tells it to listen on port 3000.

Installing Express

Our app.js required the Express.js module. We need to install express in order for this to work properly. Go to your terminal and enter this command.

npm install express --save

This command will install the express module into our package.json. The module is installed as a dependency in our package.json as shown below.

To test our application you can go to the terminal and enter the command

node app.js

Open up a browser and navigate to the url http://localhost:3000

You will see the following in your browser

Creating Website to Save Data to MongoDB Database

Instead of showing the text “Hello World” when people view your application, what we want to do is to show a place for user to save data to the database.

We are going to allow users to enter a first name and a last name that we will be saving in the database.

To do this we will need to create a basic HTML file. In your terminal enter the following command to create an index.html file.

touch index.html

In our index.html file we will be creating an input filed where users can input data that they want to have stored in the database. We will also need a button for users to click on that will add the data to the database.

Here is what our index.html file looks like.

<!DOCTYPE html>
<html>
  <head>
    <title>Intro to Node and MongoDB<title>
  <head>

  <body>
    <h1>Into to Node and MongoDB<&#47;h1>
    <form method="post" action="/addname">
      <label>Enter Your Name<&#47;label><br>
      <input type="text" name="firstName" placeholder="Enter first name..." required>
      <input type="text" name="lastName" placeholder="Enter last name..." required>
      <input type="submit" value="Add Name">
    </form>
  <body>
<html>

If you are familiar with HTML, you will not find anything unusual in our code for our index.html file. We are creating a form where users can input their first name and last name and then click an “Add Name” button.

The form will do a post call to the /addname endpoint. We will be talking about endpoints and post later in this tutorial.

Displaying our Website to Users

We were previously displaying the text “Hello World” to users when they visited our website. Now we want to display our html file that we created. To do this we will need to change the app.use line our our app.js file.

We will be using the sendFile command to show the index.html file. We will need to tell the server exactly where to find the index.html file. We can do that by using a node global call __dirname. The __dirname will provide the current directly where the command was run. We will then append the path to our index.html file.

The app.use lines will need to be changed to
app.use("/", (req, res) => {   res.sendFile(__dirname + "/index.html"); });

Once you have saved your app.js file, we can test it by going to terminal and running node app.js

Open your browser and navigate to “http://localhost:3000”. You will see the following

Connecting to the Database

Now we need to add our database to the application. We will be connecting to a MongoDB database. I am assuming that you already have MongoDB installed and running on your computer.

To connect to the MongoDB database we are going to use a module called Mongoose. We will need to install mongoose module just like we did with express. Go to your terminal and enter the following command.
npm install mongoose --save

This will install the mongoose model and add it as a dependency in our package.json.

Connecting to the Database

Now that we have the mongoose module installed, we need to connect to the database in our app.js file. MongoDB, by default, runs on port 27017. You connect to the database by telling it the location of the database and the name of the database.

In our app.js file after the line for the port and before the app.use line, enter the following two lines to get access to mongoose and to connect to the database. For the database, I am going to use “node-demo”.

var mongoose = require("mongoose"); mongoose.Promise = global.Promise; mongoose.connect("mongodb://localhost:27017/node-demo");

Creating a Database Schema

Once the user enters data in the input field and clicks the add button, we want the contents of the input field to be stored in the database. In order to know the format of the data in the database, we need to have a Schema.

For this tutorial, we will need a very simple Schema that has only two fields. I am going to call the field firstName and lastName. The data stored in both fields will be a String.

After connecting to the database in our app.js we need to define our Schema. Here are the lines you need to add to the app.js.
var nameSchema = new mongoose.Schema({   firstName: String,   lastNameName: String });

Once we have built our Schema, we need to create a model from it. I am going to call my model “DataInput”. Here is the line you will add next to create our mode.
var User = mongoose.model("User", nameSchema);

Creating RESTful API

Now that we have a connection to our database, we need to create the mechanism by which data will be added to the database. This is done through our REST API. We will need to create an endpoint that will be used to send data to our server. Once the server receives this data then it will store the data in the database.

An endpoint is a route that our server will be listening to to get data from the browser. We already have one route that we have created already in the application and that is the route that is listening at the endpoint “/” which is the homepage of our application.

HTTP Verbs in a REST API

The communication between the client(the browser) and the server is done through an HTTP verb. The most common HTTP verbs are
GET, PUT, POST, and DELETE.

The following table explains what each HTTP verb does.

HTTP Verb Operation
GET Read
POST Create
PUT Update
DELETE Delete

As you can see from these verbs, they form the basis of CRUD operations that I talked about previously.

Building a CRUD endpoint

If you remember, the form in our index.html file used a post method to call this endpoint. We will now create this endpoint.

In our previous endpoint we used a “GET” http verb to display the index.html file. We are going to do something very similar but instead of using “GET”, we are going to use “POST”. To get started this is what the framework of our endpoint will look like.

app.post("/addname", (req, res) => {
 
});
Express Middleware

To fill out the contents of our endpoint, we want to store the firstName and lastName entered by the user into the database. The values for firstName and lastName are in the body of the request that we send to the server. We want to capture that data, convert it to JSON and store it into the database.

Express.js version 4 removed all middleware. To parse the data in the body we will need to add middleware into our application to provide this functionality. We will be using the body-parser module. We need to install it, so in your terminal window enter the following command.

npm install body-parser --save

Once it is installed, we will need to require this module and configure it. The configuration will allow us to pass the data for firstName and lastName in the body to the server. It can also convert that data into JSON format. This will be handy because we can take this formatted data and save it directly into our database.

To add the body-parser middleware to our application and configure it, we can add the following lines directly after the line that sets our port.

var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
Saving data to database

Mongoose provides a save function that will take a JSON object and store it in the database. Our body-parser middleware, will convert the user’s input into the JSON format for us.

To save the data into the database, we need to create a new instance of our model that we created early. We will pass into this instance the user’s input. Once we have it then we just need to enter the command “save”.

Mongoose will return a promise on a save to the database. A promise is what is returned when the save to the database completes. This save will either finish successfully or it will fail. A promise provides two methods that will handle both of these scenarios.

If this save to the database was successful it will return to the .then segment of the promise. In this case we want to send text back the user to let them know the data was saved to the database.

If it fails it will return to the .catch segment of the promise. In this case, we want to send text back to the user telling them the data was not saved to the database. It is best practice to also change the statusCode that is returned from the default 200 to a 400. A 400 statusCode signifies that the operation failed.

Now putting all of this together here is what our final endpoint will look like.

app.post("/addname", (req, res) => {
  var myData = new User(req.body);
  myData.save()
    .then(item => {
      res.send("item saved to database");
    })
    .catch(err => {
      res.status(400).send("unable to save to database");
    });
});
Testing our code

Save your code. Go to your terminal and enter the command node app.js to start our server. Open up your browser and navigate to the URL “http://localhost:3000”. You will see our index.html file displayed to you.

Make sure you have mongo running.

Enter your first name and last name in the input fields and then click the “Add Name” button. You should get back text that says the name has been saved to the database like below.

Access to Code

The final version of the code is available in my Github repo. To access the code click here. Thank you for reading !

Создание сайта на Mongo DB, Express JS, Node JS и Angular

Создание сайта на Mongo DB, Express JS, Node JS и Angular

Видео курс по изучению стека MEAN. В курсе вы научитесь создавать сайты при помощи Node JS, Express JS, Angular JS и баз данных MongoDB. Вы ознакомитесь со всеми моментами разработки и в конце курса выгрузите сайт на удаленный сервер.

Видео курс по изучению стека MEAN. В курсе вы научитесь создавать сайты при помощи Node JS, Express JS, Angular JS и баз данных MongoDB. Вы ознакомитесь со всеми моментами разработки и в конце курса выгрузите сайт на удаленный сервер.

Angular 8 Node & Express JS File Upload

Angular 8 Node & Express JS File Upload

In this Angular 8 and Node.js tutorial, we are going to look at how to upload files on the Node server. To create Angular image upload component, we will be using Angular 8 front-end framework along with ng2-file-upload NPM package; It’s an easy to use Angular directives for uploading the files.

In this Angular 8 and Node.js tutorial, we are going to look at how to upload files on the Node server. To create Angular image upload component, we will be using Angular 8 front-end framework along with ng2-file-upload NPM package; It’s an easy to use Angular directives for uploading the files.

We are also going to take the help of Node.js to create the backend server for Image or File uploading demo. Initially, we’ll set up an Angular 8 web app from scratch using Angular CLI. You must have Node.js and Angular CLI installed in your system.

We’ll create the local server using Node.js and multer middleware. Multer is a node.js middleware for handling multipart/form-data, which is primarily used for uploading files. Once we are done setting up front-end and backend for our File uploading demo then, we’ll understand step by step how to configure file uploading in Angular 8 app using Node server.

Prerequisite

In order to show you Angular 8 File upload demo, you must have Node.js and Angular CLI installed in your system. If not then check out this tutorial: Set up Node JS

Run following command to install Angular CLI:

npm install @angular/cli -g

Install Angular 8 App

Run command to install Angular 8 project:

ng new angular-node-file-upload

# ? Would you like to add Angular routing? No
# ? Which stylesheet format would you like to use? CSS
cd angular-node-file-upload

Show Alert Messages When File Uploaded

We are going to install and configure ngx-toastr an NPM package which helps in showing the alert message when the file is uploaded on the node server.

npm install ngx-toastr --save

The ngx-toastr NPM module requires @angular/animations dependency:

npm install @angular/animations --save

Then, add the ngx-toastr CSS in angular.json file:

"styles": [
    "src/styles.css",
    "node_modules/ngx-toastr/toastr.css"
]

Import BrowserAnimationsModule and ToastrModule in app.module.ts file:

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ToastrModule } from 'ngx-toastr';
 
@NgModule({
  imports: [
    CommonModule,
    BrowserAnimationsModule, // required animations module
    ToastrModule.forRoot() // ToastrModule added
  ]
})

export class AppModule { }

Install & Configure ng-file-upload Directive

In this step, we’ll Install and configure ng-file-upload library in Angular 8 app. Run command to install ng-file-upload library.

npm install ng2-file-upload

Once the ng2-file-upload directive is installed, then import the FileSelectDirective and FormsModule in app.module.ts. We need FormsModule service so that we can create the file uploading component in Angular.

import { FileSelectDirective } from 'ng2-file-upload';
import { FormsModule } from '@angular/forms';

@NgModule({
  declarations: [
    FileSelectDirective
  ],
  imports: [
    FormsModule
  ]
})

export class AppModule { }

Setting Up Node Backend for File Upload Demo

To upload the file on the server, we need to set up a separate backend. In this tutorial, we will be using Node & Express js to create server locally along with multer, express js, body-parser, and dotenv libraries.

Run command to create backend folder in Angular app’s root directory:

mkdir backend && cd backend

In the next step, create a specific package.json file.

npm init

Run command to install required dependencies:

npm install express cors body-parser multer dotenv --save

In order to get rid from starting the server again and again, install nodemon NPM package. Use –-save-dev along with the npm command to register in the devDependencies array. It will make it available for development purpose only.

npm install nodemon --save-dev

Have a look at final pacakge.json file for file upload demo backend:

{
  "name": "angular-node-file-upload",
  "version": "1.0.0",
  "description": "Angualr 8 file upload demo app",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node server.js"
  },
  "author": "Digamber Rawat",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "dotenv": "^8.0.0",
    "express": "^4.17.1",
    "multer": "^1.4.1"
  },
  "devDependencies": {
    "nodemon": "^1.19.1"
  }
}

Create a file by the name of server.js inside backend folder:

Configure Server.js

To configure our backend we need to create a server.js file. In this file we’ll keep our backend server’s settings.

touch server.js

Now, paste the following code in backend > server.js file:

const express = require('express'),
  path = require('path'),
  cors = require('cors'),
  multer = require('multer'),
  bodyParser = require('body-parser');

// File upload settings  
const PATH = './uploads';

let storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, PATH);
  },
  filename: (req, file, cb) => {
    cb(null, file.fieldname + '-' + Date.now())
  }
});

let upload = multer({
  storage: storage
});

// Express settings
const app = express();
app.use(cors());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
  extended: false
}));

app.get('/api', function (req, res) {
  res.end('File catcher');
});

// POST File
app.post('/api/upload', upload.single('image'), function (req, res) {
  if (!req.file) {
    console.log("No file is available!");
    return res.send({
      success: false
    });

  } else {
    console.log('File is available!');
    return res.send({
      success: true
    })
  }
});

// Create PORT
const PORT = process.env.PORT || 8080;
const server = app.listen(PORT, () => {
  console.log('Connected to port ' + PORT)
})

// Find 404 and hand over to error handler
app.use((req, res, next) => {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  console.error(err.message);
  if (!err.statusCode) err.statusCode = 500;
  res.status(err.statusCode).send(err.message);
});

Now, while staying in the backend folder run the below command to start the backend server:

nodemon server.js

If everything goes fine then you’ll get the following output:

[nodemon] 1.19.1
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node server.js`
Connected to port 8080

Create Angular 8 File Upload Component

In this last step, we are going to create a file upload component in Angular 8 app using Express js API.

Get into the app.component.ts file and include the following code:

import { Component, OnInit } from '@angular/core';
import { FileUploader } from 'ng2-file-upload/ng2-file-upload';
import { ToastrService } from 'ngx-toastr';

const URL = 'http://localhost:8080/api/upload';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent implements OnInit {
  public uploader: FileUploader = new FileUploader({
    url: URL,
    itemAlias: 'image'
  });

  constructor(private toastr: ToastrService) { }

  ngOnInit() {
    this.uploader.onAfterAddingFile = (file) => {
      file.withCredentials = false;
    };
    this.uploader.onCompleteItem = (item: any, status: any) => {
      console.log('Uploaded File Details:', item);
      this.toastr.success('File successfully uploaded!');
    };
  }

}

Go to app.component.html file and add the given below code:

<div class="wrapper">
  <h2>Angular Image Upload Demo</h2>

  <div class="file-upload">
    <input type="file" name="image" ng2FileSelect [uploader]="uploader" accept="image/x-png,image/gif,image/jpeg" />
    <button type="button" (click)="uploader.uploadAll()" [disabled]="!uploader.getNotUploadedItems().length">
      Upload
    </button>
  </div>

</div>

Now, It’s time to start the Angular 8 app to check out the File upload demo in the browser. Run the following command:

ng serve --open

Make sure your NODE server must be running to manage the backend.

When you upload the image from front-end you’ll see your image files are saving inside the backend > uploads folder.

Conclusion

In this Angular 8 tutorial, we barely scratched the surface related to file uploading in a Node application. There are various other methods available on the internet through which you can achieve file uploading task quickly. However, this tutorial is suitable for beginners developers. I hope this tutorial will surely help and you if you liked this tutorial, please consider sharing it with others.