how to make a rest api using the standard library in javascript

Here's an example of how to create a simple REST API using the Node.js built-in http module:


index.tsx
const http = require('http');

const server = http.createServer((request, response) => {
  if (request.method === 'GET' && request.url === '/api/data') {
    // Return some JSON data
    response.setHeader('Content-Type', 'application/json');
    response.statusCode = 200;
    response.end(JSON.stringify({ message: 'Hello, world!' }));
  } else {
    // Return a 404 error for all other requests
    response.statusCode = 404;
    response.end('Not found');
  }
});

// Start the server
server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});
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This creates an HTTP server that listens for requests on port 3000. When a GET request is made to /api/data, the server responds with some JSON data ({ message: 'Hello, world!' }). For all other requests, the server returns a 404 error.

However, using a framework like Express.js can simplify the process of building a REST API. Here's an example using Express:


index.tsx
const express = require('express');

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

// Define a GET route that responds with some JSON data
app.get('/api/data', (req, res) => {
  res.json({ message: 'Hello, world!' });
});

// Start the server
app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}/`);
});
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This code does the same thing as the previous example, but with less boilerplate. Express provides methods for defining routes and handling requests, making it easier to build a REST API.

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