Node.js RESTful API

🚀 Node.js RESTful API (Complete Guide)

A RESTful API is an API that follows REST principles and allows clients to interact with a server using HTTP methods:

Method	Purpose
GET	Read data
POST	Create data
PUT	Update data
DELETE	Remove data

We will build a simple REST API using Node.js + Express.js.

📦 1. Project Setup

Install Express:

🏗️ 2. Create Basic Server

Create server.js:

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

// Middleware
app.use(express.json());

// Home route
app.get('/', (req, res) => {
res.send('REST API is running...');
});

// Start server
app.listen(3000, () => console.log('Server running on port 3000'));

const express = require('express');

const app = express();

// Middleware

app.use(express.json());

// Home route

app.get('/', (req, res) => {

res.send('REST API is running...');

});

// Start server

app.listen(3000, () => console.log('Server running on port 3000'));

Run the server:

🗂️ 3. Sample Data (Fake Database)

We’ll store data temporarily in an array.

🧩 4. REST API Endpoints

✅ GET All Users

✅ GET Single User by ID

✅ POST Create New User

✅ PUT Update User

app.put('/api/users/:id', (req, res) => {
const user = users.find(u => u.id === parseInt(req.params.id));
if (!user)
return res.status(404).json({ message: 'User not found' });

user.name = req.body.name || user.name;
user.email = req.body.email || user.email;

res.json(user);
});

app.put('/api/users/:id', (req, res) => {

const user = users.find(u => u.id === parseInt(req.params.id));

if (!user)

return res.status(404).json({ message: 'User not found' });

user.name = req.body.name || user.name;

user.email = req.body.email || user.email;

res.json(user);

});

✅ DELETE Remove User

📘 Full Express REST API Example

Here is the full server.js:

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

app.use(express.json());

let users = [
{ id: 1, name: 'John Doe', email: 'john@example.com' },
{ id: 2, name: 'Jane Doe', email: 'jane@example.com' }
];

// Routes
app.get('/api/users', (req, res) => res.json(users));

app.get('/api/users/:id', (req, res) => {
const user = users.find(u => u.id === parseInt(req.params.id));
if (!user) return res.status(404).json({ message: 'User not found' });
res.json(user);
});

app.post('/api/users', (req, res) => {
const { name, email } = req.body;
const user = { id: users.length + 1, name, email };
users.push(user);
res.status(201).json(user);
});

app.put('/api/users/:id', (req, res) => {
const user = users.find(u => u.id === parseInt(req.params.id));
if (!user) return res.status(404).json({ message: 'User not found' });

user.name = req.body.name || user.name;
user.email = req.body.email || user.email;

res.json(user);
});

app.delete('/api/users/:id', (req, res) => {
users = users.filter(user => user.id !== parseInt(req.params.id));
res.json({ message: 'User deleted successfully' });
});

// Start Server
app.listen(3000, () => console.log('Server running on port 3000'));

const express = require('express');

const app = express();

app.use(express.json());

let users = [

{ id: 1, name: 'John Doe', email: 'john@example.com' },

{ id: 2, name: 'Jane Doe', email: 'jane@example.com' }

];

// Routes

app.get('/api/users', (req, res) => res.json(users));

app.get('/api/users/:id', (req, res) => {

const user = users.find(u => u.id === parseInt(req.params.id));

if (!user) return res.status(404).json({ message: 'User not found' });

res.json(user);

});

app.post('/api/users', (req, res) => {

const { name, email } = req.body;

const user = { id: users.length + 1, name, email };

users.push(user);

res.status(201).json(user);

});

app.put('/api/users/:id', (req, res) => {

const user = users.find(u => u.id === parseInt(req.params.id));

if (!user) return res.status(404).json({ message: 'User not found' });

user.name = req.body.name || user.name;

user.email = req.body.email || user.email;

res.json(user);

});

app.delete('/api/users/:id', (req, res) => {

users = users.filter(user => user.id !== parseInt(req.params.id));

res.json({ message: 'User deleted successfully' });

});

// Start Server

app.listen(3000, () => console.log('Server running on port 3000'));

🧪 Testing the API

You can test it using:

✔ Postman
✔ Thunder Client (VS Code)
✔ curl

Example curl test:

🔐 Bonus: Add CORS Support

⚙️ Bonus: Use Nodemon (Auto Restart)

Add to package.json:

Run:

Node.js RESTful API

🚀 Node.js RESTful API (Complete Guide)

📦 1. Project Setup

🏗️ 2. Create Basic Server

🗂️ 3. Sample Data (Fake Database)

🧩 4. REST API Endpoints

✅ GET All Users

✅ GET Single User by ID

✅ POST Create New User

✅ PUT Update User

✅ DELETE Remove User

📘 Full Express REST API Example

🧪 Testing the API

🔐 Bonus: Add CORS Support

⚙️ Bonus: Use Nodemon (Auto Restart)

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Node.js Tutorials

Node.js RESTful API

🚀 Node.js RESTful API (Complete Guide)

📦 1. Project Setup

🏗️ 2. Create Basic Server

🗂️ 3. Sample Data (Fake Database)

🧩 4. REST API Endpoints

✅ GET All Users

✅ GET Single User by ID

✅ POST Create New User

✅ PUT Update User

✅ DELETE Remove User

📘 Full Express REST API Example

🧪 Testing the API

🔐 Bonus: Add CORS Support

⚙️ Bonus: Use Nodemon (Auto Restart)

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