Express.js | app.all() Function

The app.all() function is used to routing all types of HTTP request. Like if we have POST, GET, PUT, DELETE, etc, request made to any specific route, let say /user, so instead to defining different API’s like app.post(‘/user’), app.get(‘/user’), etc, we can define single API app.all(‘/user’) which will accept all type of HTTP request.

Syntax:

app.all( path, callback )

Parameters:

1. Path: It is the path for which the middleware function is called.
2. Callback: It can be middleware function, or a series/array of functions.

Installation of express module:

1. You can visit the link to Install express module. You can install this package by using this command.

   npm install express

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

   npm version express

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

Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

app.all('/user', function (req, res, next) {
    console.log('USER API CALLED');
    next();
});

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed express module using following command:

   npm install express

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now open your browser and make GET, POST, PUT, DELETE, or any other HTTP request method to http://localhost:3000/user and you will see the following output on console:

   Server listening on PORT 3000
   USER API CALLED
   

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