CRUD App Using Node.js & MongoDB

Introduction

In this tutorial, you'll build a full CRUD (Create, Read, Update, Delete) application using Node.js, Express, and MongoDB. This app demonstrates practical database integration and REST API development.

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Step 1: Project Setup

Initialize your project and install dependencies:

mkdir node-mongo-crud
cd node-mongo-crud
npm init -y
npm install express mongoose nodemon

Add a start script in package.json:

"scripts": {
  "start": "nodemon index.js"
}

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Step 2: Connect to MongoDB

Create index.js and connect to MongoDB:

const express = require('express');
const mongoose = require('mongoose');
const app = express();
const PORT = 3000;

app.use(express.json());

mongoose.connect('mongodb://localhost:27017/crudApp', {
  useNewUrlParser: true,
  useUnifiedTopology: true
}).then(() => console.log('MongoDB connected'))
  .catch(err => console.log(err));

app.listen(PORT, () => console.log(`Server running on http://localhost:${PORT}`));

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Step 3: Create a Mongoose Schema

Create a simple Book model:

const { Schema, model } = mongoose;

const bookSchema = new Schema({
  title: { type: String, required: true },
  author: { type: String, required: true },
  publishedYear: Number
});

const Book = model('Book', bookSchema);

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Step 4: REST API Routes

Create a Book

app.post('/books', async (req, res) => {
  const book = new Book(req.body);
  try {
    const savedBook = await book.save();
    res.status(201).json(savedBook);
  } catch(err) {
    res.status(400).json({ message: err.message });
  }
});

Read All Books

app.get('/books', async (req, res) => {
  try {
    const books = await Book.find();
    res.json(books);
  } catch(err) {
    res.status(500).json({ message: err.message });
  }
});

Read Book by ID

app.get('/books/:id', async (req, res) => {
  try {
    const book = await Book.findById(req.params.id);
    if(!book) return res.status(404).json({ message: 'Book not found' });
    res.json(book);
  } catch(err) {
    res.status(500).json({ message: err.message });
  }
});

Update a Book

app.put('/books/:id', async (req, res) => {
  try {
    const updatedBook = await Book.findByIdAndUpdate(req.params.id, req.body, { new: true });
    res.json(updatedBook);
  } catch(err) {
    res.status(400).json({ message: err.message });
  }
});

Delete a Book

app.delete('/books/:id', async (req, res) => {
  try {
    await Book.findByIdAndDelete(req.params.id);
    res.status(204).send();
  } catch(err) {
    res.status(500).json({ message: err.message });
  }
});

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Step 5: Testing

• Use Postman or Insomnia to test all CRUD endpoints.
• Verify creating, reading, updating, and deleting books works.

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Step 6: Next Steps

• Add frontend integration with React or Vue.
• Implement user authentication.
• Deploy the app using Heroku or Render.

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Conclusion

You now have a fully functional CRUD application using Node.js, Express, and MongoDB. This is a solid foundation for building real-world web applications.

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