How to Create Server in Nodejs

To create an express server in Node.js, you can follow these steps:

Install the express package from npm. This allows you to use the express framework in your application.

npm install express

Create a new file for your server-side code, such as server.js.

Import the express package at the top of your server.js file.

const express = require('express')

1. Initialize the express app by calling the express() function.

const app = express()

Define a route for the server to respond to. You can do this using the app.get() method, which takes two arguments: a path and a callback function. The callback function will be executed when a client makes a GET request to the specified path.

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

Start the server by calling the app.listen() method, which takes two arguments: a port number and a callback function. The callback function will be executed when the server is ready to start accepting requests.

app.listen(3000, () => {
  console.log('Server is listening on port 3000')
})

Your server.js file should now look something like this:

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

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

app.listen(3000, () => {
  console.log('Server is listening on port 3000')
})

To start the server, you can run the following command:

node server.js

This will start the server on port 3000, and you can now send requests to the server at http://localhost:3000.