Express.js app.mountpath Property
The app.mountpath property contains one or more path patterns on which a sub-app was mounted.
Syntax:
app.mountpath
Parameter: No parameters.
Return Value: String.
Installation of the express module:
You can visit the link to Install the 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 the 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
Project Structure:
Example 1: Filename: index.js
javascript
const express = require( 'express' ); const app = express(); // the main app const user = express(); // the sub app const PORT = 3000; user.get( '/' , function (req, res) { console.log(user.mountpath); // /user res.send( 'User Homepage' ); }); app.use( '/user' , user); // Mounting the sub app app.listen(PORT, function (err){ if (err) console.log(err); console.log( "Server listening on PORT" , PORT); }); |
Steps to run the program:
Make sure you have installed the express module using the following command:
npm install express
Run the index.js file using the below command:
node index.js
Output:
Console Output:
Server listening on PORT 3000
Now open your browser and go to http://localhost:3000/user, now you can see the following output on your console:
Server listening on PORT 3000 /user
Example 2: Filename: index.js
javascript
const express = require( 'express' ); const app = express(); const PORT = 3000; app.get( '/' , function (req, res) { console.log(app.mountpath) res.send( "OK" ) }); app.listen(PORT, function (err){ if (err) console.log(err); console.log( "Server listening on PORT" , PORT); }); |
Steps to run the program:
Run the index.js file using the below command:
node index.js
Output: Now open your browser and make a GET request to http://localhost:3000, now you can see the following output on your console:
Server listening on PORT 3000
Reference: https://expressjs.com/en/4x/api.html#app.mountpath
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