express js basics code example

Example 1: express hello world

//to run : node filename.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}`))

//visit localhost:3000
// assuming you have done 1) npm init 2) npm install express

Example 2: express js sample project

var express=require('express');
var app=express();

app.get('/',function(req,res){
	res.send("Hello World!");
});

var server=app.listen(3000,function() {});

Example 3: using multiparty with node js express

var express = require('express');
var multiparty = require('connect-multiparty'),
    multipartyMiddleware = multiparty({ uploadDir: './imagesPath' });

var router = express.Router();

router.post('/', multipartyMiddleware, function(req, res) {
  console.log(req.body, req.files);
  var file = req.files.file;
  console.log(file.name);
  console.log(file.type);
  res.status(200).send('OK');
});

module.exports = router;

Example 4: express js continous GET /json/version

probably you are using chrome, if so,
goto: chrome://inspect/#devices
click on "Open dedicated DevTools for Node"
remove your locahost:[port] from listening