Node JS Express MongoDB CRUD REST API Tutorial

In this tutorial, you will learn how to create restful CRUD APIs using node.js express and MongoDB with mongoose.

Node.js Express and MongoDB Build a Crud Rest API Example

Here are steps:

Step 1 – Create Node Express js App

Run the following command on cmd to create the node js app:

mkdir my-app
cd my-app
npm init -y

Step 2 – Install express flash Validator ejs body-parser mongoose Modules

Run the following command on the cmd to express flash ejs body-parser mysql dependencies :

npm install -g express-generator
npx express --view=ejs

npm install

npm install express-flash --save
npm install express-session --save
npm install body-parser --save
npm install cors --save
npm install mongoose

Step 3 – Connect App to MongoDB

Create a database.js file in application root directory, and add the following code to it:

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/test', {useNewUrlParser: true});
var conn = mongoose.connection;
conn.on('connected', function() {
    console.log('database is connected successfully');
});
conn.on('disconnected',function(){
    console.log('database is disconnected successfully');
})
conn.on('error', console.error.bind(console, 'connection error:'));
module.exports = conn;

Step 4 – Create Model

Create Models directory, and in this directory create userModel.js file:

var db = require("../database");
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var BookSchema = new Schema({
	title: String,
	author: String,
	category: String
});
module.exports = mongoose.model('Book', BookSchema);

Step 5 – Create CRUD Apis Routes

Edit routes/users.js route file, and create CRUD(Create, Read, Update, Delete) restful api routes in it:

var express = require('express');
var Book = require('../models/book');
var router = express.Router();
router.get('/', function(req, res){
    console.log('getting all books');
    Book.find({}).exec(function(err, books){
        if(err) {
            res.send('error has occured');
        } else {
            console.log(books);
            res.json(books);
        }
    });
});
router.get('/:id', function(req, res){
    console.log('getting one book');
    Book.findOne({
        _id: req.params.id
    }).exec(function(err, book){
        if(err) {
            res.send('error has occured');
        } else {
            console.log(book);
            res.json(book);
        }
    });
});
router.post('/', function(req, res){
    var newBook = new Book();
    newBook.title = req.body.title;
    newBook.author = req.body.author;
    newBook.category = req.body.category;
    newBook.save(function(err, book){
        if(err) {
            res.send('error saving book');
        } else {
            console.log(book);
            res.send(book);
        }
    });
});
router.put('/:id', function(req, res){
    Book.findOneAndUpdate({
        _id: req.params.id
    },{
        $set: {
            title: req.body.title,
            author: req.body.author,
            category: req.body.category
        }
    },{
        upsert: true
    },function(err, newBook){
        if(err) {
            res.send('error updating book');
        } else {
            console.log(newBook);
            res.send(newBook);
        }
    });
});
router.delete('/:id', function(req, res){
    Book.findByIdAndRemove({
        _id: req.params.id
    },function(err, book){
        if(err) {
            res.send('error deleting book');
        } else {
            console.log(book);
            res.send(book);
        }
    });
});
module.exports = router;

Step 5 – Import Modules in App.js

Import express flash session body-parser mongoose dependencies in app.js; as shown below:

const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const bodyParser = require('body-parser');
const cors = require('cors');
const books = require('./routes/books');
const app = express();
app.use(express.json());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));
app.use(cookieParser());
app.use(cors());
app.use('/books', books);
// Handling Errors
app.use((err, req, res, next) => {
    // console.log(err);
    err.statusCode = err.statusCode || 500;
    err.message = err.message || "Internal Server Error";
    res.status(err.statusCode).json({
      message: err.message,
    });
});
app.listen(3000,() => console.log('Server is running on port 3000'));

Step 7 – Test CRUD REST API Application

You can use the following command to start node js app server:

//run the below command

npm start

Open browser and type the following URL:

http://127.0.0.1:3000/books

Conclusion

Build restful crud api with node.js express and mongodb; In this tutorial; you have learned how to build/create a crud rest api using node.js express and mongodb with mongoose.

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