Express.js req.baseUrl Property

Last Updated : 07 Jul, 2020

The req.baseUrl property is the URL path on which a router instance was mounted. The req.baseUrl property is similar to the mount path property of the app object, except app.mountpath returns the matched path pattern(s).

Syntax:

req.baseUrl

Parameter: No parameters.

Returns: String

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 the 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
```

Example 1:
Filename: index.js

var express = require('express');
var app = express(); 
var PORT = 3000;
  
var user = express.Router();
  
user.get('/login', function (req, res) {
  console.log(req.baseUrl);
  res.end();
})
  
app.use('/user', user);
  
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 the 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 go to http://localhost:3000/user/login, now you can see the following output on your console:
```
Server listening on PORT 3000
/user
```

Example 2:
Filename: index.js

var express = require('express');
const e = require('express');
var app = express(); 
var PORT = 3000;
  
var student = express.Router();
app.use('/student', student);
  
student.get('/signup', function (req, res) {
    if(req.baseUrl == '/student')
    {
        console.log("Show Singup Form");
        res.end();
    } else {
        console.log("Invalid Request")
        res.send("Invalid Route")
    } 
})
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Output: Now open your browser and make GET request to http://localhost:3000/student/signup, now you can see the following output on your console:

Show Singup Form

Reference: https://expressjs.com/en/4x/api.html#req.baseUrl

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