Node And MongoDB Primer

node-mongodb.md

Node And MongoDB Primer

Installation

• Install Node
• Install MongoDB Driver locally or create a MongoDB Atlas account (see below)
• Optional : install Compass

Create a project

$ mkdir project && cd project
$ npm init -y
$ npm i mongodb

Create a local database

Create a database ("blog") and a collection ("posts"). Here a simple example in local with mongosh commands.

$ mongosh "mongodb://localhost:27017"
$ use blog
$ db.posts.insertOne( { "title":"First title (local)", "content":"First content" } );
$ show dbs
$ db.posts.find()

First connection & list resources

import { MongoClient } from 'mongodb';
// const uri = process.env.STRING_URI; // MongoDB Atlas access
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri);
async function runDB() {
  try {
    await client.connect();
    // Establish and verify connection
    await client.db('blog').command({ ping: 1 });
    console.log('Connected successfully to the database');
    // List posts
    const posts = await client.db('blog').collection('posts').find().toArray();
    console.log('POSTS : ', posts);
  } catch (err) {
    console.log(err);
  } finally {
    // Ensures that the client will close when you finish/error
    await client.close();
  }
}
runDB().catch(console.error);

List databases

const databasesList = await client.db().admin().listDatabases();
console.log('DATABASES');
databasesList.databases.forEach((db) => console.log(`- ${db.name}`));

List collections

const collections = await client.db('blog').listCollections().toArray();
console.log('COLLECTIONS : ', collections);

Create a resource

const newPost = {
  title: 'Title from node',
  content: 'Lorem Ipsum',
};
const results = await client.db('blog').collection('posts').insertOne(newPost);
console.log(`The new post is created, see the new Id : ${results.insertedId}`);

Create a resource with the body

const results = await client.db('blog').collection('posts').insertOne(req.body);
res.status(201).send(results);

MongoDB Atlas

See more on this updated tutorial

• Create an account
• Choose a cluster, you can rename it
• Security Quickstart > Authentification with a name and a password
• Security > Network Access > Add IP addresses
• Database > Collections > Add a database "blog" and a collection "posts"
• Database > Connect : copy the link mongodb+srv (string URI)
• DataBase > Connect > Your Application : copy the link to use it with node
• Optional : try with Compass

Protect your connexion string (username and password) with dotenv package

• Install dotenv : npm i dotenv
• Create the ".env" file and add the STRING_URI variable from MongoDB Atlas
• Be sure to add .env to the .gitignore file if you want to share your project