Node Js by Aryadrj

 Node Js by Aryadrj




1. How to check whether Node Js is installed in your system or not ?

  • Start your command prompt and type "node -v".


2. How to run Node Js program?

  • node yourfilename.js

3. First  Program in Node JS?

var http = require("http");

http.createServer(function (request, response) {
   response.writeHead(200, {'Content-Type': 'text/plain'});
   response.end('Welcome to Aryadrj Website.\n');
}).listen(8082);

console.log('Our Server running at http://127.0.0.1:8082/');

3. Note

  • Node.js allows you to run JavaScript on the server and Node.js has a a lots of set of built-in modules.

4. What require() function will do?

  • require() function is used to add module.
  • Example:
    • require('http');
    • Remember : We can create our own module.

5. How to take input in Node js?

const readline = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
 
readline.question('What is your name? ?', str => {
  console.log(`Hey ${str}!`);
  readline.close();
});








6. Routing in Node js?

const http = require('http');
function index (request, response) {
 response.writeHead(200);
 response.end('Hello, India!');
}
http.createServer(function (request, response) {

 if (request.url === '/aryadrj') {
 return index(request, response);
 }
 response.writeHead(404);
 response.end(http.STATUS_CODES[404]);
}).listen(8081);


  • Enter URL : localhost:8081/aryadrj in your browser

7. How to exit the server?

  • Use CTRL+C in your command prompt.

8. Can we use node shell prompt?

  • Yes we can, types node in command prompt.












9. How to exit from shell of node js?

  • press "ctrl+c" twice.

10. Is node JS frontend or backend?

  • It is used to launch  both the frontend and backend of web apps using JavaScript

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