ExpressJs Creating Routes

Syntax

app.METHOD(PATH, HANDLER)

Where:

• app is an instance of the express module.
• METHOD is an HTTP request method.
• PATH is a path on the server.
• HANDLER is a function that handles the request and generates the response.

Example

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

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.post('/', (req, res) => {
  res.send('Got a POST request')
})

app.put('/user', (req, res) => {
  res.send('Got a PUT request at /user')
})

app.delete('/user', (req, res) => {
  res.send('Got a DELETE request at /user')
})

app.listen(3000, () => {
  console.log('Example app listening on port 3000!')
})

Explanation

In ExpressJs, routes are used to handle different requests made to the server. The app.METHOD() function creates a route and specifies the HTTP request method to be handled.

The PATH argument specifies the path to be matched, and the HANDLER argument is a function that generates the response for the request.

In the example above, we have defined four different routes for the HTTP methods GET, POST, PUT and DELETE. When a request is made to the server with the corresponding HTTP method and path, the respective handler function is called to generate the response.

Use

Routes in ExpressJs are used to handle different types of requests made to the server. They can be used to serve HTML files, handle form submissions, and generate JSON responses.

Important Points

• ExpressJs routes are created using the app.METHOD() function.
• The METHOD argument specifies the HTTP request method to be handled.
• The PATH argument specifies the path to be matched.
• The HANDLER argument is a function that generates the response for the request.
• Routes can be used to handle different types of requests made to the server.
• Multiple routes can be defined for the same path and different HTTP methods.

Summary

In this article, we have learned how to create routes in ExpressJs. We have seen the syntax for defining routes and the different HTTP request methods that can be used. We have also looked at an example of defining routes for GET, POST, PUT and DELETE methods, and generating responses using handler functions.