Express.js - AJAX PATCH request

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In this article, we would like to show you how to make AJAX PATCH requests with Express.js

1. Express.js PATCH methods example

In this section, we use Express.js to handle PATCH requests.

index.js file:

const express = require('express'); // installation: npm install express

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

app.patch('/examples', (request, response) => {
    const data = request.body; 
    // make partial changes to an existing resource

    response.send('put your changed data here');

app.listen(port, () => {
    console.log(`server is listening at http://localhost:${port}`);

To run the server use: 

node index.js


server is listening at http://localhost:3000

2. Pure JavaScript (Vanilla JS) AJAX PATCH request

The following is an example execution of a fetch method that sends PATCH requests.

<!DOCTYPE html>

    var requestData = 'Some text sent to API ...';

    fetch('/examples', {
        method: 'PATCH',
        headers: {
            'Content-Type': 'text/plain',
        body: requestData
        .then((response) => response.text())
        .then((responseData) => {
      	    console.log('Success: ', responseData);
        .catch((error) => {
            console.error('Error: ', error);


  1. PATCH request - Wikipedia
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Node.js / Express.js - AJAX requests

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