expressjsHow can I create a REST API using Express.js?

Creating a REST API using Express.js is a straightforward process. Here is an example of a basic API that responds to a GET request at the /hello route:

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

app.get('/hello', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => {
  console.log('Server started');
});

Output example

Server started

The code above consists of four parts:

1. Requiring the Express.js library: const express = require('express');
2. Creating an Express.js application: const app = express();
3. Defining a route and a callback function to respond to a GET request: app.get('/hello', (req, res) => { ... });
4. Starting the server and listening on port 3000: app.listen(3000, () => { ... });

For more information on creating a REST API using Express.js, please refer to the official Express.js documentation.

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