import js file in nodejs code example

Example 1: how to import jquery in js file

var script = document.createElement('script');
script.src = 'https://code.jquery.com/jquery-3.4.1.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);

Example 2: node import all functions from file

//we are in ./utils/dbHelper.js, here we have some helper functions
function connect() {
  // connect do db...
}

function closeConnection() {
  // close connection to DB...
}

//let's export this function to show them to the world outside
module.exports = {
  connect(),
    closeConnection()
};

// now we are in ./main.js and we want use helper functions from dbHelper.js
const DbHelper = require ('./utils/dbHelper'); // import all file and name it DbHelper
DbHelper.connect(); // use function from './utils/dbHelper' using dot(.)

// or we can import only chosen function(s)
const { connect, closeConnection } = require ('./utils/dbHelper');
connect(); // use function from class without dot

Example 3: how to create a server in node js

// code by VARSHITH REDDY SATTI
// to create a server in node.js you should.
var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/html'});
  res.write("write html code to display you test")
  res.end();
}).listen(8080);
// save this as httpServer.js
// run this by typing node httpServer.js in the command line
// to acess your server got to http://localhost:8080