Express.js | app.all() Function

Last Updated : 18 Jun, 2020

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:

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

Installation of express module:

You can visit the link to Install express module. You can install this package by using this command.
```
npm install express
```
After installing express module, you can check your express version in command prompt using the command.
```
npm version express
```
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:

The project structure will look like this:
Make sure you have installed express module using following command:
```
npm install express
```
Run index.js file using below command:
```
node index.js
```
Output:
```
Server listening on PORT 3000
```
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
```

My Personal Notes

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