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Build Your First Router in Node.js with Express

  • Difficulty Level : Expert
  • Last Updated : 06 Oct, 2021
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Express.js  is a powerful framework for node.js. One of the main advantages of this framework is defining different routes or middleware to handle the client’s different incoming requests. In this article, we will discuss, how to use the router in the express.js server.

The express.Router() function is used to create a new router object. This function is used when you want to create a new router object in your program to handle requests. Multiple requests can be easily differentiated with the help of the Router() function in Express.js.This is the advantage of the use of the Router.

Syntax:

express.Router( [options] )

Optional Parameters:

  • Case-sensitive: This enables case sensitivity.
  • mergeParams: It preserves the req. params values from the parent router.
  • strict: This enables strict routing.

Return Value: This function returns the New Router Object.>



Installing Module:

npm install express

Project structure: It will look like the following.

Now we will create all the routes:

Step 1: Inside route folder create Home.js file which will handle ‘/home’ URL.

Home.js




// Importing express module
const express=require("express")
const router=express.Router()
  
// Handling request using router
router.get("/home",(req,res,next)=>{
    res.send("This is the homepage request")
})
  
// Importing the router
module.exports=router

Step 2: Now we will create our second route which will be for login and will handle ‘/login’ URL.

login.js




// Importing the module
const express=require("express")
  
// Creating express Router
const router=express.Router()
  
// Handling login request
router.get("/login",(req,res,next)=>{
  res.send("This is the login request")
})
module.exports=router

Step 3: Now inside the index.js file we will import all the created routes and use them.

Index.js




const express=require("express")
// Importing all the routes
const homeroute=require("./routes/Home.js")
const loginroute=require("./routes/login")
  
// Creating express server
const app=express()
  
// Handling routes request
app.use("/",homeroute)
app.use("/",loginroute)
app.listen((3000),()=>{
    console.log("Server is Running")
})

Step to run the application: Open the terminal and run index.js using the below command:

node index.js

Output: Open the browser and type localhost:3000 and handle the /home request by the client.




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