1570424008
Build JWT authentication with Node.js
Have you ever wondered how authentication works? What’s behind all the complexity and abstractions. Actually, nothing special. It’s a way of encrypting a value, in turn creating a unique token that users use as an identifier. This token verifies your identity. It can authenticate who you are, and authorize various resources you have access to. If you by any chance don’t know any of these keywords, be patient, I’ll explain everything below.
Node js JWT Authentication Tutorial is the topic we will discuss today. Full form of JWT is JSON Web Token. If we want to build a secure web application, then we have to implement Authentication. After that, we need to build Authorization. There are two types of Authentication you can use in any web application development.
1 - Session-based Authentication
2 - Token-based Authentication
Why we use Token-based Authentication
Session-based authentication is fine then why we want to use Token-based Authentication? The reasons are following.
- A primary reason is that it is Stateless Authentication. This token is stored client-side local storage but can be stored in session storage or a cookie as well.
- Its most use cases are single page applications, web APIs, and the Internet of Things (IoT).
- If our application is scalable and decoupled, then it is the best choice to use this de facto standard.
- It is mobile ready and web application prepared regardless of which technologies you are using to build your web and mobile app.
You may also like: How to JWT Authentication with Angular 8 and NodeJS
How JWT Works?
JSON Web Token is the token; we need to put the header in every request to verify the client. The Architecture of JWT Authentication is pretty darn simple.
- First user attempt to login with their credentials.
- After server verifies the credentials, it sends JSON Web Token to the client.
- A client then saves that token in local storage or any other storage mechanism.
- Again if a client wants to request a protected route or resource, then it sends JWT in a request header.
- The server verifies that JWT and if it is correct then return a 200 response with the information, client needs.
- If the JWT is invalid, then it gives unauthorized access or any other restricted message.
Node js JWT Authentication
In this tutorial, we are not using any front-end framework. We will use POSTMAN to request the server. We will check the auth using token. So let us get started.
Step 1: Install node js dependencies.
Create one project folder and go into that folder. Type the following command.
npm init
Now, install the following dependencies.
npm install express jsonwebtoken mongoose body-parser --save
It will install the express web framework, jsonwebtoken package to authenticate the user, mongoose schema model, and body-parser middleware.
Also, we need to install the nodemon development server to prevent the stop and restart the server process. So let us do that first.
npm install nodemon --save-dev
Rest dependencies we will install as our project grows.
Step 2: Configure the Node Server.
In the package.json file, change this object to the following.
"scripts": {
"start": "nodemon server"
},
So in the terminal when we type npm start command, we bootstrap the server.js file.
In the root folder, make one file called server.js. Configure the node server.
// server.js
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const PORT = 3000;
app.listen(PORT, function(){
console.log('Server is running on Port',PORT);
});
Now, go to terminal and hit the following instruction.
npm start
It will start the server, you can see it on a console. So it is ready to consume any request, either web or API.
Step 3: Send a request to node server via Postman.
First, we define one route and send the JSON response to the client.
// server.js
app.get('/checking', function(req, res){
res.json({
"Tutorial": "Welcome to the Node express JWT Tutorial"
});
});
Open the Postman and send the get request to http://localhost:3000/checking.
Step 4: Configure the MongoDB Database.
Write the following code to connect the Node.js application to the MongoDB database.
// server.js
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/jwtauth');
Also, write the body-parser middleware to the application.
// server.js
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
Step 5: Create a User model.
Create one new folder inside root called models. In that, create one file called user.model.js file.
// user.model.js
const mongoose = require('mongoose');
const user = mongoose.Schema({
_id: mongoose.Schema.Types.ObjectId,
email: {type: String, required: true},
password: {type: String, required: true}
});
module.exports = mongoose.model('User', user);
We have defined the schema for the User collection.
Step 6: Create the routes for users.
In the root, make one folder called routes. In that folder, create one file called user.route.js. Now we need to sign the user up for our application. So let us define the post route to signup the user. We also need a bcrypt module to hash the password. We can not store the plain password. So let us install bcrypt module first.
npm install bcrypt --save
Next, write the following code into the user.route.js file.
// user.route.js
const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const User = require('../models/user.model');
router.post('/signup', function(req, res) {
bcrypt.hash(req.body.password, 10, function(err, hash){
if(err) {
return res.status(500).json({
error: err
});
}
else {
const user = new User({
_id: new mongoose.Types.ObjectId(),
email: req.body.email,
password: hash
});
user.save().then(function(result) {
console.log(result);
res.status(200).json({
success: 'New user has been created'
});
}).catch(error => {
res.status(500).json({
error: err
});
});
}
});
});
module.exports = router;
What it does is that it tries to hash the incoming request’s password property. If it fails to do so then returns a response with an error in json format. If it successes then it will create a new user and add that to the MongoDB database. Now include this user.route.js file in the server.js file. I am writing the whole file now.
// server.js
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const user = require('./routes/user.route');
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/jwtauth');
const PORT = 3000;
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.get('/checking', function(req, res){
res.json({
"Tutorial": "Welcome to the Node express JWT Tutorial"
});
});
app.use('/user', user);
app.listen(PORT, function(){
console.log('Server is running on Port',PORT);
});
Step 7: Send a post request from the Postman.
Open the postman send a request in a row format with application type json(application/json).
You can see here, I have created user successfully. Now, I am using Studio 3T for MongoDB. So here is the newly created user in the database.
Step 8: Sign In the User.
Go to the user.route.js file and define the signin route.
// user.route.js
router.post('/signin', function(req, res){
User.findOne({email: req.body.email})
.exec()
.then(function(user) {
bcrypt.compare(req.body.password, user.password, function(err, result){
if(err) {
return res.status(401).json({
failed: 'Unauthorized Access'
});
}
if(result) {
return res.status(200).json({
success: 'Welcome to the JWT Auth'
});
}
return res.status(401).json({
failed: 'Unauthorized Access'
});
});
})
.catch(error => {
res.status(500).json({
error: error
});
});;
});
First, I have checked if the user’s email exists or not. If not then return 401 unauthorized access. If email is there then check the password with bcrypted database password if match found then welcome to the JWT auth else 401 unauthorized access.
If the Authentication Attempt is not successful, then we will get the following error.
Step 9: Return the JWT, if auth attempt successful.
If the user’s credentials email and password are valid then in response, we need to return a JWT token. So let us generate the token and return to the user.
// user.route.js
const jwt = require('jsonwebtoken');
if(result) {
const JWTToken = jwt.sign({
email: user.email,
_id: user._id
},
'secret',
{
expiresIn: '2h'
});
return res.status(200).json({
success: 'Welcome to the JWT Auth',
token: JWTToken
});
}
The format of JWT Token is as following.
HEADER: ALGORITHM & TOKEN TYPE
{
“alg”: “HS256”,
“typ”: “JWT”
}
PAYLOAD:DATA
{
“email”: “quaytayx3@gmail.com”,
“_id”: “5a7c9bd8fc3e501c94aa6035”,
“iat”: 1518120124,
“exp”: 1518127324
}
VERIFY SIGNATURE
HMACSHA256(
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
secret
)
So it is a combination of header, payload, and secretkey, we are providing. Remember, You need to define your secret key in your environment variable file. I have just shown here for the demo purpose. So it will produce the following JWT token.
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImtydW5hbGxhdGhpeWExMEBnbWFpbC5jb20iLCJfaWQiOiI1YTdjOWJkOGZjM2U1MDFjOTRhYTYwMzUiLCJpYXQiOjE1MTgxMjAxMjQsImV4cCI6MTUxODEyNzMyNH0._6qVGQV_KYlonawnaTHG-OhOJLV4tgD-Eob5iRz89AM
Now use this token to access the protected resources to your application and we are done here. So this is how you can generate the JWT Auth Token.
Finally, our Node js JWT Authentication Tutorial From Scratch is over.
Learn More
Building REST API with Nodejs / MongoDB /Passport /JWT
Angular 8 - JWT Authentication Example & Tutorial
Build A Node.js API Authentication With JWT Tutorial
Thanks for reading
#node-js #web-development
What is GEEK
Buddha Community
1632537859
NBB: Ad-hoc CLJS Scripting on Node.js
Nbb
Not babashka. Node.js babashka!?
Ad-hoc CLJS scripting on Node.js.
Status
Experimental. Please report issues here.
Goals and features
Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.
Additional goals and features are:
- Fast startup without relying on a custom version of Node.js.
- Small artifact (current size is around 1.2MB).
- First class macros.
- Support building small TUI apps using Reagent.
- Complement babashka with libraries from the Node.js ecosystem.
Requirements
Nbb requires Node.js v12 or newer.
How does this tool work?
CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).
Usage
Install nbb from NPM:
$ npm install nbb -g
Omit -g for a local install.
Try out an expression:
$ nbb -e '(+ 1 2 3)'
6
And then install some other NPM libraries to use in the script. E.g.:
$ npm install csv-parse shelljs zx
Create a script which uses the NPM libraries:
(ns script
(:require ["csv-parse/lib/sync$default" :as csv-parse]
["fs" :as fs]
["path" :as path]
["shelljs$default" :as sh]
["term-size$default" :as term-size]
["zx$default" :as zx]
["zx$fs" :as zxfs]
[nbb.core :refer [*file*]]))
(prn (path/resolve "."))
(prn (term-size))
(println (count (str (fs/readFileSync *file*))))
(prn (sh/ls "."))
(prn (csv-parse "foo,bar"))
(prn (zxfs/existsSync *file*))
(zx/$ #js ["ls"])
Call the script:
$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs
Macros
Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:
(defmacro plet
[bindings & body]
(let [binding-pairs (reverse (partition 2 bindings))
body (cons 'do body)]
(reduce (fn [body [sym expr]]
(let [expr (list '.resolve 'js/Promise expr)]
(list '.then expr (list 'clojure.core/fn (vector sym)
body))))
body
binding-pairs)))
Using this macro we can look async code more like sync code. Consider this puppeteer example:
(-> (.launch puppeteer)
(.then (fn [browser]
(-> (.newPage browser)
(.then (fn [page]
(-> (.goto page "https://clojure.org")
(.then #(.screenshot page #js{:path "screenshot.png"}))
(.catch #(js/console.log %))
(.then #(.close browser)))))))))
Using plet this becomes:
(plet [browser (.launch puppeteer)
page (.newPage browser)
_ (.goto page "https://clojure.org")
_ (-> (.screenshot page #js{:path "screenshot.png"})
(.catch #(js/console.log %)))]
(.close browser))
See the puppeteer example for the full code.
Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.
Startup time
$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)' 0.17s user 0.02s system 109% cpu 0.168 total
The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.
Dependencies
NPM dependencies
Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.
Classpath
To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.
To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:
$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"
and then feed it to the --classpath argument:
$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]
Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.
Current file
The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:
(ns foo
(:require [nbb.core :refer [*file*]]))
(prn *file*) ;; "/private/tmp/foo.cljs"
(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"
Reagent
Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:
$ npm install ink
ink-demo.cljs:
(ns ink-demo
(:require ["ink" :refer [render Text]]
[reagent.core :as r]))
(defonce state (r/atom 0))
(doseq [n (range 1 11)]
(js/setTimeout #(swap! state inc) (* n 500)))
(defn hello []
[:> Text {:color "green"} "Hello, world! " @state])
(render (r/as-element [hello]))
Promesa
Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:
(ns prom
(:require [promesa.core :as p]))
(defn sleep [ms]
(js/Promise.
(fn [resolve _]
(js/setTimeout resolve ms))))
(defn do-stuff
[]
(p/do!
(println "Doing stuff which takes a while")
(sleep 1000)
1))
(p/let [a (do-stuff)
b (inc a)
c (do-stuff)
d (+ b c)]
(prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3
Also see API docs.
Js-interop
Since nbb v0.0.75 applied-science/js-interop is available:
(ns example
(:require [applied-science.js-interop :as j]))
(def o (j/lit {:a 1 :b 2 :c {:d 1}}))
(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1
Most of this library is supported in nbb, except the following:
- destructuring using
:syms - property access using
.-xnotation. In nbb, you must use keywords.
See the example of what is currently supported.
Examples
See the examples directory for small examples.
Also check out these projects built with nbb:
- c64core: retrocompute aesthetics twitter bot
- gallery.cljs: script to download walpapers from windowsonearth.org.
- nbb-action-example: example of a Github action built with nbb.
API
See API documentation.
Migrating to shadow-cljs
See this gist on how to convert an nbb script or project to shadow-cljs.
Build
Prequisites:
- babashka >= 0.4.0
- Clojure CLI >= 1.10.3.933
- Node.js 16.5.0 (lower version may work, but this is the one I used to build)
To build:
- Clone and cd into this repo
bb release
Run bb tasks for more project-related tasks.
Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb
License: EPL-1.0
#node #javascript
1616671994
Hire Dedicated Node.js Developers - Hire Node.js Developers
If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.
If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.
WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.
So what are you waiting for? Get your app developed with strong performance parameters from WebClues Infotech
For inquiry click here: https://www.webcluesinfotech.com/hire-nodejs-developer/
Book Free Interview: https://bit.ly/3dDShFg
#hire dedicated node.js developers #hire node.js developers #hire top dedicated node.js developers #hire node.js developers in usa & india #hire node js development company #hire the best node.js developers & programmers
1622719015
Why use Node.js for Web Development? Benefits and Examples of Apps
Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices.
Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend.
What is Node.js?
Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently.
The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.
What Are the Advantages of Node.js Web Application Development?
Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers.
Amazing Tech Stack for Web Development
The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module.
Alongside prevalence, Node.js additionally acquired the fundamental JS benefits:
- quick execution and information preparing;
- exceptionally reusable code;
- the code is not difficult to learn, compose, read, and keep up;
- tremendous asset library, a huge number of free aides, and a functioning local area.
In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development).
Designers Can Utilize JavaScript for the Whole Undertaking
This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable.
In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based.
A Quick Environment for Microservice Development
There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations).
Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.
Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while.
Versatile Web Application Development
Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements.
Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility.
Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root.
What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations.
Control Stream Highlights
Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation.
In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.
Final Words
So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development.
I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call.
Good Luck!
#node.js development company in india #node js development company #hire node js developers #hire node.js developers in india #node.js development services #node.js development
1616839211
Node JS Development Company| Node JS Web Developers-SISGAIN
Top organizations and start-ups hire Node.js developers from SISGAIN for their strategic software development projects in Illinois, USA. On the off chance that you are searching for a first rate innovation to assemble a constant Node.js web application development or a module, Node.js applications are the most appropriate alternative to pick. As Leading Node.js development company, we leverage our profound information on its segments and convey solutions that bring noteworthy business results. For more information email us at hello@sisgain.com
#node.js development services #hire node.js developers #node.js web application development #node.js development company #node js application
1625114985
Top 10 NodeJs app Development Companies- ValueCoders
Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.
Are you striving to develop an application using Node.js? But can’t decide which company to hire for NodeJS app development? Well! Don’t stress over it, as the following list of NodeJS app development companies is going to help you find the best partner.
Let’s take a glance at top NodeJS application development companies to hire developers in 2021 for developing a mind-blowing application solution.
Before enlisting companies, I would like to say that every company has a foundation on which they thrive. Their end goals, qualities, and excellence define their competence. Thus, I prepared this list by considering a number of aspects. While making this list, I have considered the following aspects:
- Review and rating
- Enlisted by software peer & forums
- Hourly price
- Offered services
- Year of experience (Average 8+ years)
- Credibility & Excellence
- Served clients and more
I believe this list will help you out in choosing the best NodeJS service provider company. So, now let’s explore the top NodeJS developer companies to choose from in 2021.
#1. JSGuru
JSGuru is a top-rated NodeJS app development company with an innovative team of dedicated NodeJS developers engaged in catering best-class UI/UX design, software products, and AWS professional services.
It is a team of one of the most talented developers to hire for all types of innovative solution development, including social media, dating, enterprise, and business-oriented solutions. The company has worked for years with a number of startups and launched a variety of products by collaborating with big-name corporations like T-systems.
If you want to hire NodeJS developers to secure an outstanding application, I would definitely suggest them. They serve in the area of eLearning, FinTech, eCommerce, Telecommunications, Mobile Device Management, and more.
-
Ratings: 4.9/5.0
-
Founded: 2006
-
Headquarters: Banja Luka, Bosnia, and Herzegovina
-
Price: Starting from $50/hour
Visit Website - https://www.valuecoders.com/blog/technology-and-apps/top-node-js-app-development-companies
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