all-in-one/backend/expressJS/README.md

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Create Express JS project

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Reference

Create a project skeleton

Option1 : Using basic npm step

$ mkdir myapp
$ cd myapp

$ npm init

$ npm install express --save

Option2 : Using npx express application generator.

$ mkdir myapp
$ cd myappnpm
$ npx express-generator
$ npm install

Bootstrapped project folders

C:.
|   app.js
|   package-lock.json
|   package.json
|
+---bin
|       www
|
+---public
|   +---images
|   +---javascripts
|   \---stylesheets
|           style.css
|
+---routes
|       index.js
|       users.js
|
\---views
        error.jade
        index.jade
        layout.jade

Launch vscode IDE

$ code .

Validate the ./bin/www.js. By default, server serve at port 3000

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

Add new route in app.js for helloworld routing

var helloworldRouter = require('./routes/helloworld');
//...
app.use('/', indexRouter);
app.use('/users', usersRouter);
// new routing to helloworld
app.use('/helloworld', helloworldRouter);

Create new routing for ./routes/helloworld.js

var express = require('express');
var router = express.Router();

// GET method
router.get('/', function (req, res) {
    res.send('Hello World!')
  })
  
// POST method
router.post('/', function (req, res) {
    res.send('Got a POST request')
})

// PUT method
router.put('/user', function (req, res) {
    res.send('Got a PUT request at helloworld/user')
})
  
module.exports = router;

Run the server

$ npm start
...
> expressjs@0.0.0 start C:\dev\playground\expressJS
> node ./bin/www

Browse localhost. You should see the text in browser

Express
Welcome to Express

Use Postman to execute 'POST', 'PUT' methods

Postman json

Create Login

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