ExpressJs Session01
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The document discusses Express.js, a web framework for Node.js. It provides an overview of Express.js and how it can be used to start an application server listening on a port, handle HTTP requests asynchronously with methods like GET and POST. It also includes code samples of setting up a basic Express server with a "Hello World" route, installing Express, and using routes to define how the app responds to different URIs and HTTP methods.
ExpressJs Session01
- 1. Workshop @ Ramnshee Infotech By Jainul Musani 1 SESSION:01 Express JS
- 2. ExpressJs Express.js is a web framework that could be used with Node.js. Express.js can start an application server listening on a port in your machine. Express.js starts the application in a single thread and handles HTTP methods like GET, POST, DELETE, etc., asynchronously. SESSION:01 Express JS
- 3. ExpressJs – Sample Server app.js var express = require('express') var app = express() app.get('/', function (req, res) { res.send(‘Started Server with ExpressJs FrameWork') res.end() }) app.listen(8000) SESSION:01 Express JS
- 4. Install Express.js Assuming you’ve already installed Node.js, create a directory to hold your application, and make that your working directory. C:nodejs> mkdir myapp C:nodejs> cd myapp Use the npm init command to create a package.json file for your application. C:nodejs> npm init –y Now install Express in the myapp directory and save it in the dependencies list. C:nodejs> npm install express –save SESSION:01 Express JS
- 5. Hello world example - Express.Js const express = require('express') const app = express() const port = 3000 app.get('/', (req, res) => { res.send('Hello World!') }) app.listen(port, () => { console.log(`Example app listening at http://localhost:${port}`) }) SESSION:01 Express JS
- 6. Run “Hello World” Run the app with the following command: C:nodejs> node app.js SESSION:01 Express JS
- 7. Express.js Routes An Express.js Route defines how our Express application can respond to a client request to with a specific URI (or path) and a specific HTTP request method (GET, POST, etc.). A basic Express application as shown below. app.js var express = require('express') var app = express() // start the server var server = app.listen(8000, function(){ console.log('Listening on port 8000...') }) SESSION:01 Express JS
- 8. Express.js Routes Here Express.js Routes come into picture. app.get('/', function (req, res) { res.send('This is a basic Example for Express.js') }) SESSION:01 Express JS Training Batch - Winter
- 9. Express.js Routes app.js var express = require('express') var app = express() app.get('/', function (req, res) { res.send('Home.') }) app.get('/hello/', function (req, res) { res.send('Hello page.') }) app.get('/bye/', function (req, res) { res.send('Bye page.') }) var server = app.listen(8000, function(){ console.log('Listening on port 8000...‘) // start the server }) SESSION:01 Express JS