AJAX stands for Asynchronous JavaScript and XML, which is a technique used to make asynchronous requests to a web server from the client-side. However, in Node.js, there is no client-side environment, and therefore AJAX is not directly applicable.

Instead, in Node.js, you can use the built-in HTTP or HTTPS modules to make HTTP requests to a server from the server-side. Here are a few ways you can make HTTP requests in Node.js:

1. Using the built-in http module:

const http = require('http');
const options = {
hostname: 'example.com',
port: 80,
path: '/api/data',
method: 'GET'
const req = http.request(options, res => {
console.log(`statusCode: ${res.statusCode}`);
res.on('data', d => {
req.on('error', error => {

2. Using the axios module:

const axios = require('axios');
.then(response => {
.catch(error => {


3. Using the request module:

const request = require('request');
request('https://example.com/api/data', (error, response, body) => {

Note that in Node.js, you cannot use AJAX to directly manipulate the HTML DOM as you would in a browser environment. However, you can use templating engines like EJS or Pug to generate HTML on the server-side and send it to the client as a response to an HTTP request.

4. In an Express.js application,

you can use the built-in fetch API to make AJAX requests from the client-side to the server-side. Here’s an example of how to use fetch in an Express.js route:
// server.js
const express = require('express');
const app = express();
app.get('/api/data', (req, res) => {
const data = { message: 'Hello, world!' };
app.listen(3000, () => console.log('Server started'));
// client.js
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error(error));

The Express.js server listens on port 3000 and responds to a GET request to the /api/data endpoint with a JSON object containing a message. On the client-side, the fetch API sends a GET request to the same endpoint and logs the JSON response to the console.

You can also use third-party libraries like axios or request in an Express.js application to make HTTP requests from the server-side to an external API. Here’s an example of how to use axios in an Express.js route:
const axios = require('axios');
app.get('/api/external-data', (req, res) => {
.then(response => res.send(response.data))
.catch(error => console.error(error));

The Express.js server responds to a GET request to the /api/external-data endpoint by making a GET request to the jsonplaceholder API using axios. The server then sends the response data from the external API to the client-side.

These links provide additional information and resources related to the topic of implementing AJAX in NodeJS, as well as best practices and different libraries for handling AJAX requests.