Hướng dẫn tạo project NodeJS và connect mongodb

Prerequisites

• Install NodeJS: Linux or Windows
• Install Yarn: npm install -g yarn

Init project

touch index.js

yarn init -y

Install packages

yarn add express mongoose body-parser cors nodemon dotenv

• express: nodejs frameword help to create routing for app
• mongoose: help to create model for database
• body-parser: express middleware
• dotenv: Load environment variables from .env file

Connect database

1. Goto Google and search "mongo atlas"
2. Login with google
3. Create a cluster
4. Choose AWS and server Singapore => click Create Cluster
5. Goto Database Access => Add New Database User => Filling all info => Add User
6. Goto Network Access => Add IP Address
7. Back to Cluster => click CONNECT => Choose "Connect your application"
8. Add connect db to index.js

Initial Code for index.js

import express from 'express';

import bodyParser from 'body-parser';

import cors from 'cors';

import mongoose from 'mongoose';

import postsRouter from './src/routers/posts.js';

import crawlerRouter from './src/routers/crawler.js';

import dotenv from 'dotenv';

dotenv.config();

const app = express();

const PORT = process.env.PORT || 5000;

const DATABASE_URL = process.env.DATABASE_URL;

app.use(bodyParser.json());

// Limit the data which the client will submit on server

app.use(bodyParser.urlencoded({ extended: true, limit: '30mb' }));

app.use(cors());

app.use('/posts', postsRouter);

app.use('/crawl-data', crawlerRouter);

mongoose.connect(DATABASE_URL, {

useNewUrlParser: true,

useUnifiedTopology: true, useFindAndModify: false

}).then(() => {

console.log('Connected to database!');

app.listen(PORT, () => {

console.log(`Server is running on port ${PORT}`);

})

}).catch((error) => {

console.log('Error', error);

})

Create .env file at root folder

PORT = 5000

DATABASE_URL = 'url'

Run project

1. Add code below to package.json
   
   "scripts": { "start": "nodemon index.js"
   },
2. Run command line: yarn start

Create project structure

mkdir src

cd src

mkdir routers

mkdir controllers

mkdir models