Node.js Tutorial for Beginners 20 - Introduction to Express.js

npm init command

$ npm init
This utility will walk you through creating a package.json file.
Press ^C at any time to quit.
name: (express_test) demo
version: (1.0.0)
description: Demo of package.json
entry point: (index.js)
test command:
git repository:
keywords:
author: 
license: (ISC)

install express via npm

 npm install express --save

index.js

var express = require('express');

var app = express();
// GET
// POST
// PUT
// DELETE

app.get('/', function(req, rep) {
    rep.send('this is home page');
})

app.get('/about', function(req, rep) {
    rep.send('this is about page');
})

app.get('/contect', function(req, rep) {
    rep.send('this is contect page');
})

app.listen(3000, function() {
    console.log('our server is live on posrt 3000');
})

package.json

{
  "name": "express_test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.14.1"
  }
}