How to Build Angular CRUD Using Node js Express and MySQL?

Hello Friends,

In this tutorial, I will show you how to build a full-stack (Angular 12 + Node.js + Express + MySQL) example with a CRUD Application. The back-end server uses Node.js + Express for REST APIs, front-end side is an Angular App with HTTPClient.

We assume that you have already available the above tools/frameworks and you are familiar with all the above that what individually actually does. So now we will proceed step by step to achieve the task.

Step 1: Create New Angular App

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

ng new angular-mean-crud-tutorial

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

ng add @angular/material

Step 2: Create Components in Angular

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

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

Step 3: 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';
 
@NgModule({
    declarations: [],
    imports: [
        FormsModule,
        HttpClientModule,
        ReactiveFormsModule
    ],
    providers: [],
    bootstrap: []
})
 
export class AppModule { }

Step 4: Create CRUD Routes

In this step, create routes; with the help of Angular 12 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 }
];
 
@NgModule({
    imports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
})
 
export class AppRoutingModule { }

Step 5: Build RESTful API with Node and Express

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 MySQL database.

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

mkdir nodejs-express-sequelize-mysql
cd nodejs-express-sequelize-mysql

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 12 CRUD system:

npm install express sequelize mysql2 body-parser cors --save

The package.json file should look like this:

{
    "name": "nodejs-express-sequelize-mysql",
    "version": "1.0.0",
    "description": "Node.js Rest Apis with Express, Sequelize & MySQL",
    "main": "server.js",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "keywords": [
        "nodejs",
        "express",
        "rest",
        "api",
        "sequelize",
        "mysql"
    ],
    "author": "nicesnippets",
    "license": "ISC",
    "dependencies": {
        "cors": "^2.8.5",
        "express": "^4.17.1",
        "mysql2": "^2.0.2",
        "sequelize": "^5.21.2"
    }
}

Create a separate config folder for configuration with db.config.js file like this:

module.exports = {
    HOST: "localhost",
    USER: "root",
    PASSWORD: "123456",
    DB: "testdb",
    dialect: "mysql",
    pool: {
        max: 5,
        min: 0,
        acquire: 30000,
        idle: 10000
    }
};

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

module.exports = (sequelize, Sequelize) => {
    const Book = sequelize.define("tutorial", {
        title: {
            type: Sequelize.STRING
        },
        price: {
            type: Sequelize.STRING
        },
        description: {
            type: Sequelize.STRING
        }
    });
    return Book;
};

Then initialize Sequelize in /models folder that will contain model in the next step.

Now create /models/index.js with the following code:

const dbConfig = require("../config/db.config.js");
 
const Sequelize = require("sequelize");
const sequelize = new Sequelize(dbConfig.DB, dbConfig.USER, dbConfig.PASSWORD, {
    host: dbConfig.HOST,
    dialect: dbConfig.dialect,
    operatorsAliases: false,
 
    pool: {
        max: dbConfig.pool.max,
        min: dbConfig.pool.min,
        acquire: dbConfig.pool.acquire,
        idle: dbConfig.pool.idle
    }
});
 
const db = {};
 
db.Sequelize = Sequelize;
db.sequelize = sequelize;
 
db.books= require("./books.js")(sequelize, Sequelize);
 
module.exports = db;

Don’t forget to call sync() method in server.js:

...

const app = express();
app.use(...);
 
const db = require("./app/models");
db.sequelize.sync();
 
...

Then, You need to define the REST API routes using Express js in a node project. Create node-backend/routes directory, 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('../models/Book');
 
// Add Book
bookRoute.route('/add-book').post((req, res, next) => {
    Book.create(req.body, (error, data) => {
        if (error) {
            return next(error)
        } else {
            res.json(data)
        }
    })
});
 
// Get all Book
bookRoute.route('/').get((req, res) => {
    Book.find((error, data) => {
        if (error) {
            return next(error)
        } else {
            res.json(data)
        }
    })
})
 
// Get Book
bookRoute.route('/read-book/:id').get((req, res) => {
    Book.findById(req.params.id, (error, data) => {
        if (error) {
            return next(error)
        } else {
            res.json(data)
        }
    })
})
 
 
// 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);
            console.log(error)
        } else {
            res.json(data)
            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 {
            res.status(200).json({
                msg: data
            })
        }
    })
})
 
module.exports = bookRoute;

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

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

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cors = require("cors");
var bodyParser = require('body-parser');
 
var corsOptions = {
    origin: "http://localhost:8081"
};
 
app.use(cors(corsOptions));
 
const bookRoute = require('./routes/book.routes')
 
const app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: false
}));

app.use(cors());
 
// Static directory path
app.use(express.static(path.join(__dirname, 'dist/angular-mean-crud-tutorial')));
 
 
// API root
app.use('/api', bookRoute)
 
// PORT
const port = process.env.PORT || 8000;
 
app.listen(port, () => {
    console.log('Listening on port ' + port)
})
 
// 404 Handler
app.use((req, res, next) => {
    next(createError(404));
});
 
// 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) {
    console.error(err.message);
    if (!err.statusCode) err.statusCode = 500;
    res.status(err.statusCode).send(err.message);
});

Step 6: 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 a 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';
 
@Injectable({
    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)
        .pipe(
            catchError(this.handleError)
        )
    }
 
    // 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 || {}
            }),
            catchError(this.handleError)
        )
    }
 
    // 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 })
        .pipe(
            catchError(this.handleError)
        )
    }
 
    // 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(
            catchError(this.handleError)
        )
    }
 
 
    // 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}`;
        }
        console.log(errorMessage);
        return throwError(errorMessage);
    }
}

Step 7: Add code In app.component.html

In this step, create HTML for the CRUD app in angular 12. 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">How to Build Angular CRUD Using Node js Express and MySQL? - Nicesnippets.com</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>
            <li class="nav-item">
                <a class="nav-link" routerLinkActive="active" routerLink="/add-book">Add Books</a>
            </li>
        </ul>
    </div>
</nav>
 
<router-outlet></router-outlet>

Step 8: 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";
 
@Component({
    selector: 'app-add-book',
    templateUrl: './add-book.component.html',
    styleUrls: ['./add-book.component.scss']
})
 
export class AddBookComponent implements OnInit {
 
    bookForm: FormGroup;
   
    constructor(
        public formBuilder: FormBuilder,
        private router: Router,
        private ngZone: NgZone,
        private crudService: CrudService
    ) 
    { 
        this.bookForm = this.formBuilder.group({
            name: [''],
            price: [''],
            description: ['']
        })
    }
 
    ngOnInit() { }
 
    onSubmit(): any {
        this.crudService.AddBook(this.bookForm.value)
        .subscribe(() => {
            console.log('Data added successfully!')
            this.ngZone.run(() => this.router.navigateByUrl('/books-list'))
        }, (err) => {
            console.log(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">
                <label>Name</label>
                <input class="form-control" type="text" formControlName="name" required>
            </div>
   
            <div class="form-group">
                <label>Price</label>
                <input class="form-control" type="text" formControlName="price" required>
            </div>
   
            <div class="form-group">
                <label>Description</label>
                <input class="form-control" type="text" formControlName="description" required>
            </div>
   
            <div class="form-group">
                <button class="btn btn-primary btn-block" type="submit">Add Book</button>
            </div>
        </form>
    </div>
</div>

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

import { Component, OnInit } from '@angular/core';
import { CrudService } from './../../service/crud.service';
 
@Component({
    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 => {
            console.log(res)
            this.Books =res;
        });    
    }
 
    delete(id:any, i:any) {
        console.log(id);
        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>
    <div class="table-responsive">
        <table class="table table-bordered">
            <thead>
                <tr>
                    <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>
            </thead>
            <tbody>
                <tr *ngFor="let book of Books; let i = index">
                    <th scope="row">{{book._id}}</th>
                    <td>{{book.name}}</td>
                    <td>{{book.price}}</td>
                    <td>{{book.description}}</td>
                    <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>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</div>

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";
 
@Component({
    selector: 'app-book-detail',
    templateUrl: './book-detail.component.html',
    styleUrls: ['./book-detail.component.scss']
})
 
export class BookDetailComponent implements OnInit {
 
    getId: any;
    updateForm: FormGroup;
   
    constructor(
        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 => {
            this.updateForm.setValue({
                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) => {
            console.log(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">
                <label>Name</label>
                <input class="form-control" type="text" formControlName="name" required>
            </div>
            <div class="form-group">
                <label>Price</label>
                <input class="form-control" type="text" formControlName="price" required>
            </div>
            <div class="form-group">
                <label>Description</label>
                <input class="form-control" type="text" formControlName="description" required>
            </div>
            <div class="form-group">
                <button class="btn btn-primary btn-block" type="submit">Update</button>
            </div>
        </form>
    </div>
</div>

I hope it can help you...