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Node.js / Express.js - AJAX PATCH request

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

1. Express.js PATCH methods example

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

Note: it is required to add external library to run below example, so use:

npm install express

index.js

const express = require('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

Output:

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>
<html>
  <body>
    <script>

      var bodyData = 'text';

      fetch('/examples', {
        method: 'PATCH',
        headers: {
          'Content-Type': 'text/plain',
        },
        body: bodyData,
      })
        .then((response) => response.json())
        .then((data) => {
          console.log('Success:', data);
        })
        .catch((error) => {
          console.error('Error:', error);
        });
    </script>
  </body>
</html>

Resources

  1. PATCH request - wikipedia

Node.js / Express.js - AJAX requests

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