In this tutorial, you'll learn how to build a simple Node.js application to perform CRUD (Create, Read, Update, Delete) operations using Express and a mock data array.
Node.js CRUD Operations
1. Setting Up the Project
Start by setting up a new Node.js project:
mkdir crud-app
cd crud-app
npm init -y
npm install express body-parserThis initializes a new project, installs Express, and the body-parser middleware to handle JSON requests.
2. Create the CRUD API
Now, create `app.js` to define routes for each CRUD operation:
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.json());
// Mock data
let users = [{ id: 1, name: 'John Doe' }];
// Create user
app.post('/users', (req, res) => {
const newUser = req.body;
newUser.id = users.length + 1;
users.push(newUser);
res.status(201).json(newUser);
});
// Get all users
app.get('/users', (req, res) => {
res.json(users);
});
// Update user
app.put('/users/:id', (req, res) => {
const user = users.find(u => u.id === parseInt(req.params.id));
if (user) {
user.name = req.body.name;
res.json(user);
} else {
res.status(404).send('User not found');
}
});
// Delete user
app.delete('/users/:id', (req, res) => {
const index = users.findIndex(u => u.id === parseInt(req.params.id));
if (index !== -1) {
users.splice(index, 1);
res.status(204).send();
} else {
res.status(404).send('User not found');
}
});
app.listen(3000, () => {
console.log('Server is running on http://localhost:3000');
});This code defines routes for creating, reading, updating, and deleting users. It uses mock data for demonstration.
3. Running the Server
Run the application with:
node app.jsAfter starting the server, you can test CRUD operations using Postman or by making HTTP requests directly.
4. Conclusion
You've successfully built a simple CRUD API with Node.js and Express. You can expand this by integrating a real database and adding more complex logic to your API.
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