Nodejs MongoDB Tutorial

Tutorial of how to build a CRUD (create, read, update, delete) application using Node.js and MongoDB. This tutorial assumes that you have some familiarity with these technologies, but even if you don’t, you should still be able to follow along.

First, you’ll need to install the following dependencies:

• Node.js
• MongoDB

Once you have these dependencies installed, you can create a new Node.js project and install the required libraries:

$ mkdir my-project$ cd my-project$ npm init -y$ npm install express mongodb

Next, you’ll need to set up a connection to your MongoDB database. You can do this by creating a new file called database.js and adding the following code:

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb+srv://<username>:<password>@cluster0.mongodb.net/test?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
  const collection = client.db("test").collection("devices");
  // perform actions on the collection object
  client.close();
});

Replace <username> and <password> with your MongoDB username and password.

With the database connection set up, you can now start building the CRUD routes for your application. Here’s an example of how you might do this using the express library:

const express = require('express');
const app = express();
const port = 3000;


app.get('/', (req, res) => {
  res.send('Hello World!');
});


app.post('/users', (req, res) => {
  // Create a new user
});


app.get('/users', (req, res) => {
  // Get a list of all users
});


app.get('/users/:id', (req, res) => {
  // Get a single user by ID
});


app.put('/users/:id', (req, res) => {
  // Update a user by ID
});


app.delete('/users/:id', (req, res) => {
  // Delete a user by ID
});


app.listen(port, () => {
  console.log(`Server listening on port ${port}

You can then use the mongodb library to perform the actual CRUD operations on the database. For example, here’s how you might implement the POST route to create a new user:

app.post('/users', (req, res) => {
  const user = req.body;
  collection.insertOne(user, (err, result) => {
    if (err) {
      return res.status(500).send(err);
    }
    res.send(result.ops[0]);
  });
});

This is just a basic example, but it should give you an idea of how to build a CRUD application using Node.js and MongoDB. You can find more detailed documentation and examples on the Node.js and Mongo

Conclusion:

In conclusion, building a CRUD application using Node.js and MongoDB is a straightforward process. By following the steps outlined in this tutorial, you should be able to set up a connection to a MongoDB database, create routes for performing CRUD operations, and use the mongodb library to interact with the database. With these building blocks in place, you can start building more complex applications that store and manipulate data.