Reading Path Parameters in Node.js

The path parameter is a variable that allows the user to add a parameter in his resource point (API endpoint) whose value can be changed. Path parameters offer a unique opportunity for the user to control the representations of resources.

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

const express = require("express")
const path = require('path')
const app = express()

var PORT = process.env.port || 3000

// View Engine Setup
app.set("views", path.join(__dirname))
app.set("view engine", "ejs")

app.get("/user/:id/:start/:end", function(req, res){

 var user_id = req.params['id']
 var start = req.params['start']
 var end = req.params['end']

 console.log("User ID :",user_id);
 console.log("Start :",start);
 console.log("End :",end);
})

app.listen(PORT, function(error){
 if (error) throw error
 console.log("Server created Successfully on PORT", PORT)
})

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed ‘view engine’ like I have used ‘ejs’ and install express module using the following commands:

   npm install express
   npm install ejs

3. Run index.js file using below command:

   node index.js

4. Open browser and type this URL “http://localhost:3000/user/1234/1/10” as shown below:
   
5. Go back to console and you can see the path parameter value as shown below:
   

So this is how you can use the path parameter in Node.js which offers a unique opportunity for the user to control the representations of resources.