Express app.delete() Function

The app.delete() function is used to define a route that handles HTTP DELETE requests for a specified path. It accepts a path and one or more callback functions that are executed when a matching DELETE request is received.

Syntax: 

app.delete(path, callback [, callback ...])

Parameters: 

• path: The path for which the DELETE request is handled.
• callback: A middleware function or multiple callback functions that handle the request.

Return Value: Returns the Express application instance.

Steps to Install the express module:

Step 1: You can install this package by using this command.

npm install express

Step 2: After installing the express module, you can check your express version in the command prompt using the command.

npm version express

Step 3: After that, you can just create a folder and add a file, for example, index.js. To run this file you need to run the following command.

node index.js

Project Structure:

Example: Below is the example of the app.delete() Function:

const express = require('express');
const app = express();
const PORT = 3000;
app.delete('/user', function (req, res) {
    res.send('DELETE request received');
});
app.listen(PORT, function () {
    console.log(`Server listening on PORT ${PORT}`);
});

Steps to run the program: 

node index.js

Console Output:

Server listening on PORT 3000

Browser Output: Now make a DELETE request to http://localhost:3000/user and you will get the following output: 

Example 2: Handling a DELETE Request with a Route Parameter

const express = require('express');
const app = express();
const PORT = 3000;
app.delete('/user/:id', function (req, res) {
    res.send(`User ${req.params.id} deleted`);
});
app.listen(PORT, function () {
    console.log(`Server listening on PORT ${PORT}`);
});

Steps to run the program: 

node index.js

Console Output:

Server listening on PORT 3000

Browser Output: Now make a DELETE request to http://localhost:3000/user/101 and you will get the following output: 

Working of app.delete()

• A DELETE route is defined using app.delete().
• Express receives a DELETE request for the specified path.
• Express matches the request with the DELETE route.
• The callback function is executed.
• The callback sends a response to the client.

Use Cases of app.delete()

• Deleting a resource from an application.
• Creating DELETE APIs for RESTful applications.
• Removing users or records from a database.
• Handling resource deletion based on route parameters.
• Implementing delete operations in web APIs.