In this blog, we'll explore how to create a basic CRUD (Create, Read, Update, Delete) API using Express.js and MongoDB with the help of Mongoose. We'll begin by setting up the project using the express-generator and then delve into the implementation of CRUD operations on a 'user' collection in MongoDB.

user.js file

const mongoose = require('mongoose');

// Connecting to MongoDB

mongoose.connect("mongodb://127.0.0.1:27017/pracMongo");

// Defining User Schema

const userSchema = mongoose.Schema({ username: String, name: String, age: Number });

// Exporting User Model

module.exports = mongoose.model("user", userSchema);

index.js file

const express = require('express');

const router = express.Router();

const userModel = require('./users');

// Create a User

router.get('/create', async function (req, res) { const user = await userModel.create({ username: "boika123", age: 21, name: "boika" });

res.send(user); });

// Retrieve All Users

router.get('/allUsers', async function (req, res) { const allUsers = await userModel.find(); res.send(allUsers); });

// Retrieve a Specific User

router.get('/one_user', async function (req, res) { const specificUser = await userModel.findOne({ username: "boika123" }); res.send(specificUser); });

// Delete a User

router.get('/delete', async function (req, res) { const deletedUser = await userModel.findOneAndDelete({ username: "boika123" }); res.send(deletedUser); });

// Update a User

i have kept it as Home-Work for you , try doing it yourself and once done and comment it

// Exporting the Router

module.exports = router;

By following this guide, you've set up a basic Express.js server with MongoDB integration using Mongoose. This code provides a foundation for building more complex applications with additional features and routes. Feel free to expand upon this base to create a more comprehensive API tailored to your specific needs.