Express.js res.links() Function
The res.links() function is used to join the links provided as properties of the parameter to populate the response’s Link HTTP header field.
Syntax:
res.links( links )
Parameter: The link parameter describes the name of the link to be joined.
Return Value: It returns an Object.
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
javascript
var express = require( 'express' ); var app = express(); var PORT = 3000; // Without middleware app.get( '/' , function (req, res){ res.links({ }); console.log(res.get( 'link' )); }); 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 browser and go to http://localhost:3000/, now check your console and you will see the following output:
Example 2: Filename: index.js
javascript
var express = require( 'express' ); var app = express(); var PORT = 3000; // With middleware app.use( '/' , function (req, res, next){ res.links({ }); next(); }) app.get( '/' , function (req, res){ console.log(res.get( 'link' )); res.send(); }); 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
Now open browser and go to http://localhost:3000/, now check your console and you will see the following output:
Reference: https://expressjs.com/en/5x/api.html#res.links
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