Karim Aya

Karim Aya


How to Create Crud Apps using Angular | MEAN Stack

In this tutorial, we will learn how to create ( MEAN Stack) crud apps using angular 13 + node js express rest API and MongoDB.

Create New Angular App

First of all, open your terminal and execute the following command on it to install angular app:

ng new my-new-app

Then execute the following command on terminal to install angular material:

ng add @angular/material

Create Components in Angular

In this step, you need to execute the following commands on terminal to generate components in our angular application. So, open y cour terminal and execute the following command:

ng g c components/add-book
ng g c components/book-detail
ng g c components/books-list

Import Modules in app.module.ts

In this step, visit src/app directory and open app.module.ts file. Then add the following code into it:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
  declarations: [],
  imports: [
  providers: [],
  bootstrap: []
export class AppModule { }

Create CRUD Routes

In this step, create routes; with the help of Angular routes. So, you will make the consensus with components to enable the navigation in the CRUD application so add the below code in the app-routing.module.ts file.

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { BooksListComponent } from './components/books-list/books-list.component';
import { AddBookComponent } from './components/add-book/add-book.component';
import { BookDetailComponent } from './components/book-detail/book-detail.component';
const routes: Routes = [
  { path: '', pathMatch: 'full', redirectTo: 'add-book' },
  { path: 'books-list', component: BooksListComponent },
  { path: 'add-book', component: AddBookComponent },
  { path: 'edit-book/:id', component: BookDetailComponent }
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
export class AppRoutingModule { }

Build RESTful API using Node + Express js + MongoDB

In this step, you will learn how to create RESTful API with Node and Express.js, not just that to handle the data we will learn to use mongoDB.

So, execute the below command to invoke the REST API development with Node and Express.js:

mkdir node-rest-api && cd node-rest-api

Then execute:

npm init -y

After that, execute the following commands to install imperative npm packages which will help us to create REST APIs for our Angular CRUD system:

npm install express cors body-parser mongoose
npm install nodemon --save-dev

To store the data flawlessly, you need a reliable database of what else could be a better choice than mongoDB. So, create a node-backend/database directory, also generate the db.js file where all the logic will be piled up for invoking the mongoDB connection.

mkdir database && cd database && touch db.js

Add the below code in node-backend/database/db.js file.

module.exports = {
    db: 'mongodb://localhost:27017/db'

Now, you need to create the Book model or schema, create node-backend/model folder. Also create a Book.js file and add the below code into it:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
let Book = new Schema({
  name: {
    type: String
  price: {
    type: String
  description: {
    type: String
}, {
  collection: 'books'
module.exports = mongoose.model('Book', Book)

Then, You need to define the REST API routes using Express js in a node project. Create node-backend/routes folder, also create book.routes.js file, Add the below code into it:

const express = require('express');
const app = express();
const bookRoute = express.Router();
let Book = require('../model/Book');
// Add Book
bookRoute.route('/add-book').post((req, res, next) => {
    Book.create(req.body, (error, data) => {
    if (error) {
      return next(error)
    } else {
// Get all Book
bookRoute.route('/').get((req, res) => {
    Book.find((error, data) => {
    if (error) {
      return next(error)
    } else {
// Get Book
bookRoute.route('/read-book/:id').get((req, res) => {
    Book.findById(req.params.id, (error, data) => {
    if (error) {
      return next(error)
    } else {
// Update Book
bookRoute.route('/update-book/:id').put((req, res, next) => {
    Book.findByIdAndUpdate(req.params.id, {
    $set: req.body
  }, (error, data) => {
    if (error) {
      return next(error);
    } else {
      console.log('Book updated successfully!')
// Delete Book
bookRoute.route('/delete-book/:id').delete((req, res, next) => {
    Book.findByIdAndRemove(req.params.id, (error, data) => {
    if (error) {
      return next(error);
    } else {
        msg: data
module.exports = bookRoute;

Now, you need to sum up all the code and conjugate at one place so that you can run our backend and propel the CRUD app development forward.

Create and add the below code in index.js file:

let express = require('express'),
  path = require('path'),
  mongoose = require('mongoose'),
  cors = require('cors'),
  bodyParser = require('body-parser'),
  mongoDb = require('./database/db');
mongoose.Promise = global.Promise;
mongoose.connect(mongoDb.db, {
  useNewUrlParser: true,
  useFindAndModify: false,
  useUnifiedTopology: true
}).then(() => {
    console.log('Database sucessfully connected ')
  error => {
    console.log('Database error: ' + error)
const bookRoute = require('./routes/book.routes')
const app = express();
  extended: false
// Static directory path
app.use(express.static(path.join(__dirname, 'dist/angular-mean-crud-tutorial')));
// API root
app.use('/api', bookRoute)
const port = process.env.PORT || 8000;
app.listen(port, () => {
  console.log('Listening on port ' + port)
// 404 Handler
app.use((req, res, next) => {
// Base Route
app.get('/', (req, res) => {
  res.send('invaild endpoint');
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist/angular-mean-crud-tutorial/index.html'));
// error handler
app.use(function (err, req, res, next) {
  if (!err.statusCode) err.statusCode = 500;

Create Angular Service for REST API Consumption

In this step, visit app/service directory in Angular project and create Book.ts class within.

Then, add the below code in app/service/Book.ts file:

export class Book {
    _id!: String;
    name!: String;
    price!: String;
    description!: String;

Then, execute the command to create crud service file:

ng g s service/crud

Then, add the below code in app/service/crud.service.ts file:

import { Injectable } from '@angular/core';
import { Book } from './Book';
import { catchError, map } from 'rxjs/operators';
import { Observable, throwError } from 'rxjs';
import { HttpClient, HttpHeaders, HttpErrorResponse } from '@angular/common/http';
  providedIn: 'root'
export class CrudService {
  // Node/Express API
  REST_API: string = 'http://localhost:8000/api';
  // Http Header
  httpHeaders = new HttpHeaders().set('Content-Type', 'application/json');
  constructor(private httpClient: HttpClient) { }
  // Add
  AddBook(data: Book): Observable<any> {
    let API_URL = `${this.REST_API}/add-book`;
    return this.httpClient.post(API_URL, data)
  // Get all objects
  GetBooks() {
    return this.httpClient.get(`${this.REST_API}`);
  // Get single object
  GetBook(id:any): Observable<any> {
    let API_URL = `${this.REST_API}/read-book/${id}`;
    return this.httpClient.get(API_URL, { headers: this.httpHeaders })
      .pipe(map((res: any) => {
          return res || {}
  // Update
  updateBook(id:any, data:any): Observable<any> {
    let API_URL = `${this.REST_API}/update-book/${id}`;
    return this.httpClient.put(API_URL, data, { headers: this.httpHeaders })
  // Delete
  deleteBook(id:any): Observable<any> {
    let API_URL = `${this.REST_API}/delete-book/${id}`;
    return this.httpClient.delete(API_URL, { headers: this.httpHeaders}).pipe(
  // Error 
  handleError(error: HttpErrorResponse) {
    let errorMessage = '';
    if (error.error instanceof ErrorEvent) {
      // Handle client error
      errorMessage = error.error.message;
    } else {
      // Handle server error
      errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;
    return throwError(errorMessage);

Add code In app.component.html

In this step, create html and for crud app in angular . So, visit src/app/app.component.html and update the following code into it:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand">Angular 13 CRUD Operations Demo</a>
  <div id="navbarNav" class="collapse navbar-collapse">
    <ul class="navbar-nav ml-auto ">
      <li class="nav-item">
        <a class="nav-link" routerLinkActive="active" routerLink="/books-list">Show Books</a>
      <li class="nav-item">
        <a class="nav-link" routerLinkActive="active" routerLink="/add-book">Add Books</a>

Create Operation

After that, Add the code in add-book.component.ts file:

import { Component, OnInit, NgZone } from '@angular/core';
import { Router } from '@angular/router';
import { CrudService } from './../../service/crud.service';
import { FormGroup, FormBuilder } from "@angular/forms";
  selector: 'app-add-book',
  templateUrl: './add-book.component.html',
  styleUrls: ['./add-book.component.scss']
export class AddBookComponent implements OnInit {
  bookForm: FormGroup;
    public formBuilder: FormBuilder,
    private router: Router,
    private ngZone: NgZone,
    private crudService: CrudService
  ) { 
    this.bookForm = this.formBuilder.group({
      name: [''],
      price: [''],
      description: ['']
  ngOnInit() { }
  onSubmit(): any {
    .subscribe(() => {
        console.log('Data added successfully!')
        this.ngZone.run(() => this.router.navigateByUrl('/books-list'))
      }, (err) => {

Then, Add the code in add-book.component.html file:

<div class="row justify-content-center mt-5">
    <div class="col-md-4">
        <form [formGroup]="bookForm" (ngSubmit)="onSubmit()">
          <div class="form-group">
            <input class="form-control" type="text" formControlName="name" required>
          <div class="form-group">
            <input class="form-control" type="text" formControlName="price" required>
          <div class="form-group">
            <input class="form-control" type="text" formControlName="description" required>
          <div class="form-group">
            <button class="btn btn-primary btn-block" type="submit">Add Book</button>

Add the code in books-list.component.ts file:

import { Component, OnInit } from '@angular/core';
import { CrudService } from './../../service/crud.service';
  selector: 'app-books-list',
  templateUrl: './books-list.component.html',
  styleUrls: ['./books-list.component.scss']
export class BooksListComponent implements OnInit {
  Books:any = [];
  constructor(private crudService: CrudService) { }
  ngOnInit(): void {
    this.crudService.GetBooks().subscribe(res => {
      this.Books =res;
  delete(id:any, i:any) {
    if(window.confirm('Do you want to go ahead?')) {
      this.crudService.deleteBook(id).subscribe((res) => {
        this.Books.splice(i, 1);

Add the code in books-list.component.html file:

<div class="container">
  <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
    <h2 class="h2">Books List</h2>
  <div class="table-responsive">
    <table class="table table-bordered">
          <th scope="col">Id</th>
          <th scope="col">Name</th>
          <th scope="col">Price</th>
          <th scope="col">Description</th>
          <th class="text-center" scope="col">Action</th>
        <tr *ngFor="let book of Books; let i = index">
          <th scope="row">{{book._id}}</th>
          <td class="text-center">
            <button class="btn btn-sm btn-primary" routerLink="/edit-book/{{book._id}}">Edit</button>
            <button class="btn btn-sm btn-danger" (click)="delete(book._id, i)">Delete</button>

Add the code in book-detail.component.ts file:

import { Component, OnInit, NgZone } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';
import { CrudService } from './../../service/crud.service';
import { FormGroup, FormBuilder } from "@angular/forms";
  selector: 'app-book-detail',
  templateUrl: './book-detail.component.html',
  styleUrls: ['./book-detail.component.scss']
export class BookDetailComponent implements OnInit {
  getId: any;
  updateForm: FormGroup;
    public formBuilder: FormBuilder,
    private router: Router,
    private ngZone: NgZone,
    private activatedRoute: ActivatedRoute,
    private crudService: CrudService
  ) {
    this.getId = this.activatedRoute.snapshot.paramMap.get('id');
    this.crudService.GetBook(this.getId).subscribe(res => {
        name: res['name'],
        price: res['price'],
        description: res['description']
    this.updateForm = this.formBuilder.group({
      name: [''],
      price: [''],
      description: ['']
  ngOnInit() { }
  onUpdate(): any {
    this.crudService.updateBook(this.getId, this.updateForm.value)
    .subscribe(() => {
        console.log('Data updated successfully!')
        this.ngZone.run(() => this.router.navigateByUrl('/books-list'))
      }, (err) => {

Add the code in book-detail.component.html file:

 <div class="row justify-content-center mt-5">
  <div class="col-md-4">
    <form [formGroup]="updateForm" (ngSubmit)="onUpdate()">
      <div class="form-group">
        <input class="form-control" type="text" formControlName="name" required>
      <div class="form-group">
        <input class="form-control" type="text" formControlName="price" required>
      <div class="form-group">
        <input class="form-control" type="text" formControlName="description" required>
      <div class="form-group">
        <button class="btn btn-primary btn-block" type="submit">Update</button>

In this tutorial, we have learned how to create crud app in angular 13 using nodejs and mongo db with built REST API.


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How to Create Crud Apps using Angular | MEAN Stack
Hertha  Mayer

Hertha Mayer


Authentication In MEAN Stack - A Quick Guide

I consider myself an active StackOverflow user, despite my activity tends to vary depending on my daily workload. I enjoy answering questions with angular tag and I always try to create some working example to prove correctness of my answers.

To create angular demo I usually use either plunker or stackblitz or even jsfiddle. I like all of them but when I run into some errors I want to have a little bit more usable tool to undestand what’s going on.

Many people who ask questions on stackoverflow don’t want to isolate the problem and prepare minimal reproduction so they usually post all code to their questions on SO. They also tend to be not accurate and make a lot of mistakes in template syntax. To not waste a lot of time investigating where the error comes from I tried to create a tool that will help me to quickly find what causes the problem.

Angular demo runner
Online angular editor for building demo.

Let me show what I mean…

Template parser errors#

There are template parser errors that can be easy catched by stackblitz

It gives me some information but I want the error to be highlighted

#mean stack #angular 6 passport authentication #authentication in mean stack #full stack authentication #mean stack example application #mean stack login and registration angular 8 #mean stack login and registration angular 9 #mean stack tutorial #mean stack tutorial 2019 #passport.js

Easter  Deckow

Easter Deckow


PyTumblr: A Python Tumblr API v2 Client



Install via pip:

$ pip install pytumblr

Install from source:

$ git clone https://github.com/tumblr/pytumblr.git
$ cd pytumblr
$ python setup.py install


Create a client

A pytumblr.TumblrRestClient is the object you'll make all of your calls to the Tumblr API through. Creating one is this easy:

client = pytumblr.TumblrRestClient(

client.info() # Grabs the current user information

Two easy ways to get your credentials to are:

  1. The built-in interactive_console.py tool (if you already have a consumer key & secret)
  2. The Tumblr API console at https://api.tumblr.com/console
  3. Get sample login code at https://api.tumblr.com/console/calls/user/info

Supported Methods

User Methods

client.info() # get information about the authenticating user
client.dashboard() # get the dashboard for the authenticating user
client.likes() # get the likes for the authenticating user
client.following() # get the blogs followed by the authenticating user

client.follow('codingjester.tumblr.com') # follow a blog
client.unfollow('codingjester.tumblr.com') # unfollow a blog

client.like(id, reblogkey) # like a post
client.unlike(id, reblogkey) # unlike a post

Blog Methods

client.blog_info(blogName) # get information about a blog
client.posts(blogName, **params) # get posts for a blog
client.avatar(blogName) # get the avatar for a blog
client.blog_likes(blogName) # get the likes on a blog
client.followers(blogName) # get the followers of a blog
client.blog_following(blogName) # get the publicly exposed blogs that [blogName] follows
client.queue(blogName) # get the queue for a given blog
client.submission(blogName) # get the submissions for a given blog

Post Methods

Creating posts

PyTumblr lets you create all of the various types that Tumblr supports. When using these types there are a few defaults that are able to be used with any post type.

The default supported types are described below.

  • state - a string, the state of the post. Supported types are published, draft, queue, private
  • tags - a list, a list of strings that you want tagged on the post. eg: ["testing", "magic", "1"]
  • tweet - a string, the string of the customized tweet you want. eg: "Man I love my mega awesome post!"
  • date - a string, the customized GMT that you want
  • format - a string, the format that your post is in. Support types are html or markdown
  • slug - a string, the slug for the url of the post you want

We'll show examples throughout of these default examples while showcasing all the specific post types.

Creating a photo post

Creating a photo post supports a bunch of different options plus the described default options * caption - a string, the user supplied caption * link - a string, the "click-through" url for the photo * source - a string, the url for the photo you want to use (use this or the data parameter) * data - a list or string, a list of filepaths or a single file path for multipart file upload

#Creates a photo post using a source URL
client.create_photo(blogName, state="published", tags=["testing", "ok"],

#Creates a photo post using a local filepath
client.create_photo(blogName, state="queue", tags=["testing", "ok"],
                    tweet="Woah this is an incredible sweet post [URL]",

#Creates a photoset post using several local filepaths
client.create_photo(blogName, state="draft", tags=["jb is cool"], format="markdown",
                    data=["/Users/johnb/path/to/my/image.jpg", "/Users/johnb/Pictures/kittens.jpg"],
                    caption="## Mega sweet kittens")

Creating a text post

Creating a text post supports the same options as default and just a two other parameters * title - a string, the optional title for the post. Supports markdown or html * body - a string, the body of the of the post. Supports markdown or html

#Creating a text post
client.create_text(blogName, state="published", slug="testing-text-posts", title="Testing", body="testing1 2 3 4")

Creating a quote post

Creating a quote post supports the same options as default and two other parameter * quote - a string, the full text of the qote. Supports markdown or html * source - a string, the cited source. HTML supported

#Creating a quote post
client.create_quote(blogName, state="queue", quote="I am the Walrus", source="Ringo")

Creating a link post

  • title - a string, the title of post that you want. Supports HTML entities.
  • url - a string, the url that you want to create a link post for.
  • description - a string, the desciption of the link that you have
#Create a link post
client.create_link(blogName, title="I like to search things, you should too.", url="https://duckduckgo.com",
                   description="Search is pretty cool when a duck does it.")

Creating a chat post

Creating a chat post supports the same options as default and two other parameters * title - a string, the title of the chat post * conversation - a string, the text of the conversation/chat, with diablog labels (no html)

#Create a chat post
chat = """John: Testing can be fun!
Renee: Testing is tedious and so are you.
John: Aw.
client.create_chat(blogName, title="Renee just doesn't understand.", conversation=chat, tags=["renee", "testing"])

Creating an audio post

Creating an audio post allows for all default options and a has 3 other parameters. The only thing to keep in mind while dealing with audio posts is to make sure that you use the external_url parameter or data. You cannot use both at the same time. * caption - a string, the caption for your post * external_url - a string, the url of the site that hosts the audio file * data - a string, the filepath of the audio file you want to upload to Tumblr

#Creating an audio file
client.create_audio(blogName, caption="Rock out.", data="/Users/johnb/Music/my/new/sweet/album.mp3")

#lets use soundcloud!
client.create_audio(blogName, caption="Mega rock out.", external_url="https://soundcloud.com/skrillex/sets/recess")

Creating a video post

Creating a video post allows for all default options and has three other options. Like the other post types, it has some restrictions. You cannot use the embed and data parameters at the same time. * caption - a string, the caption for your post * embed - a string, the HTML embed code for the video * data - a string, the path of the file you want to upload

#Creating an upload from YouTube
client.create_video(blogName, caption="Jon Snow. Mega ridiculous sword.",

#Creating a video post from local file
client.create_video(blogName, caption="testing", data="/Users/johnb/testing/ok/blah.mov")

Editing a post

Updating a post requires you knowing what type a post you're updating. You'll be able to supply to the post any of the options given above for updates.

client.edit_post(blogName, id=post_id, type="text", title="Updated")
client.edit_post(blogName, id=post_id, type="photo", data="/Users/johnb/mega/awesome.jpg")

Reblogging a Post

Reblogging a post just requires knowing the post id and the reblog key, which is supplied in the JSON of any post object.

client.reblog(blogName, id=125356, reblog_key="reblog_key")

Deleting a post

Deleting just requires that you own the post and have the post id

client.delete_post(blogName, 123456) # Deletes your post :(

A note on tags: When passing tags, as params, please pass them as a list (not a comma-separated string):

client.create_text(blogName, tags=['hello', 'world'], ...)

Getting notes for a post

In order to get the notes for a post, you need to have the post id and the blog that it is on.

data = client.notes(blogName, id='123456')

The results include a timestamp you can use to make future calls.

data = client.notes(blogName, id='123456', before_timestamp=data["_links"]["next"]["query_params"]["before_timestamp"])

Tagged Methods

# get posts with a given tag
client.tagged(tag, **params)

Using the interactive console

This client comes with a nice interactive console to run you through the OAuth process, grab your tokens (and store them for future use).

You'll need pyyaml installed to run it, but then it's just:

$ python interactive-console.py

and away you go! Tokens are stored in ~/.tumblr and are also shared by other Tumblr API clients like the Ruby client.

Running tests

The tests (and coverage reports) are run with nose, like this:

python setup.py test

Author: tumblr
Source Code: https://github.com/tumblr/pytumblr
License: Apache-2.0 license

#python #api 

Harry Patel

Harry Patel


A Complete Process to Create an App in 2021

It’s 2021, everything is getting replaced by a technologically emerged ecosystem, and mobile apps are one of the best examples to convey this message.

Though bypassing times, the development structure of mobile app has also been changed, but if you still follow the same process to create a mobile app for your business, then you are losing a ton of opportunities by not giving top-notch mobile experience to your users, which your competitors are doing.

You are about to lose potential existing customers you have, so what’s the ideal solution to build a successful mobile app in 2021?

This article will discuss how to build a mobile app in 2021 to help out many small businesses, startups & entrepreneurs by simplifying the mobile app development process for their business.

The first thing is to EVALUATE your mobile app IDEA means how your mobile app will change your target audience’s life and why your mobile app only can be the solution to their problem.

Now you have proposed a solution to a specific audience group, now start to think about the mobile app functionalities, the features would be in it, and simple to understand user interface with impressive UI designs.

From designing to development, everything is covered at this point; now, focus on a prelaunch marketing plan to create hype for your mobile app’s targeted audience, which will help you score initial downloads.

Boom, you are about to cross a particular download to generate a specific revenue through your mobile app.

#create an app in 2021 #process to create an app in 2021 #a complete process to create an app in 2021 #complete process to create an app in 2021 #process to create an app #complete process to create an app

Ananya Gupta

Ananya Gupta


What Is MEAN STACK and Scope of MEAN STACK Developer ?

What is MEAN Stack Developer?
MEAN Stack Developer is a programmer who operates on the MEAN stack. He works on the backend plus the front end of the application. They are all JavaScript based and therefore a MEAN developer should have excellent JS knowledge, for which you can join MEAN Stack Online Training Program.

Skillets of MEAN Stack developer
• Knowledge of working on the Front-end and Back-end processes
• Work with HTML & CSS
• Understanding of programming templates and architecture design guidelines
• Knowledge of continuous integration, web development, and cloud technologies
• Excellent understanding of DB architecture
• Knowledge of SDLC and experience developing in an Agile environment
• Collaborate with the IT team to build robust systems to support business objectives
• Hands-on experience on Mongo, Angular, Express, Node.
Future of MEAN stack Developer

Being, a Mean stack developer is a highly desirable, challenging vocation. So, if you are ready to work on the diverse skill set and have the experience of working with various code languages and application, then you will become successful MEAN stack developer.

Scope of MEAN stack developer

MEAN Stack Development is the best career prospect today with unlimited growth and scope. The national Indian median salary was around 76K $ pa according to Glassdoor.com. All you need to do is get cracking on your skill set by joining MEAN Stack course in Delhi, earn your certification and through your job experience and continued experiential learning keep pace with newer iterations in technology.
Developers are available in various process streams like Backend, Frontend, Database, Testing, and Mobile Apps. Older practices were that as you gain experience and expertise you would pursue specialization and progress your career in that direction.
How Can I Start Learning Mean Stack Course Step By Step? Modern best practices have changed the trend.
Skill upgrades and building proficiency in:
• JavaScript
• Ruby, PHP, or Python which are all-purpose languages.
• Postgres, Oracle, or MySQL, relational-database systems.
• Any web-server which includes Nginx or Apache
• FreeBSD, Ubuntu, or CentOS deployment OS.
• Any system for instance GIT for version-control

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