NodeJS - Master Guide Tutorial (Included REST APIs, GraphQL)

Node.JS tutorial guide

Node.js is a JavaScript runtime that is event-driven and asynchronous, making it ideal for creating scalable network applications. The next "hello world" example allows for the handling of multiple connections at once. Every connection triggers the callback, but if nothing has to be done, Node.js will sleep.

const http = require('http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

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This contrasts with the concurrency approach that is currently more often used, which makes use of OS threads. The utilization of thread-based networking is extremely challenging and wasteful. Node.js users also don't have to worry about deadlocks because there aren't any locks. Node.js has almost no functions that conduct I/O directly, therefore the process never blocks until the I/O is carried out using synchronous methods from the standard library. Scalable systems can easily be created in Node.js because nothing blocks.

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