expressjsHow do I create a REST API with Express.js?

Creating a REST API with Express.js is relatively simple. The following example code shows how to create a basic API with two endpoints: GET /hello and POST /hello.

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

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

app.post('/hello', (req, res) => {
  res.send('You just called the post method at "/hello"')
})

app.listen(3000)

The code above will create an Express.js server listening on port 3000. When a GET request is sent to /hello, it will respond with Hello World! and when a POST request is sent to /hello, it will respond with You just called the post method at "/hello".

The code above includes the following parts:

• const express = require('express'): This imports the Express.js module.
• const app = express(): This creates an Express.js application.
• app.get('/hello', (req, res) => {...}): This creates a GET endpoint at /hello.
• app.post('/hello', (req, res) => {...}): This creates a POST endpoint at /hello.
• app.listen(3000): This starts the server and makes it listen on port 3000.

For more information on creating a REST API with Express.js, see the following links:

• Express.js Documentation
• Building a RESTful API with Node.js and Express

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