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JavaScript, traditionally known for its client-side capabilities, has expanded into server-side programming with the advent of environments like Node.js. This allows developers to write code that runs on a server, handling tasks such as database operations, authentication, file handling, and more. This approach enables developers to use a single language across both the client and server sides of an application, streamlining development and fostering better integration.

 JavaScript, especially with Node.js, utilizes an event-driven, non-blocking I/O model, which makes it efficient for real-time applications.

 JavaScript's asynchronous nature and event loop make it capable of handling multiple concurrent operations, which is crucial for scalable applications.

 Developers can use JavaScript both on the client (in browsers) and server sides, which simplifies development and maintenance.

 Node.js is a runtime environment that allows JavaScript to be used for server-side scripting. It's built on Chrome's V8 JavaScript engine2.

 Event-driven, non-blocking I/O, robust package ecosystem (npm).

const http = require('http');

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

server.listen(3000, '127.0.0.1', () => {
  console.log('Server running at http://127.0.0.1:3000/');
});

 Deno is a modern runtime for JavaScript and TypeScript. Created by the original developer of Node.js, it aims to address some of Node.js's shortcomings3.

 Secure by default, uses modern JavaScript, includes TypeScript support out of the box.

import { serve } from "https://deno.land/std@0.100.0/http/server.ts";

const server = serve({ port: 8000 });
console.log("http://localhost:8000/");

for await (const req of server) {
  req.respond({ body: "Hello, World!\n" });
}

 The non-blocking I/O model makes it ideal for data-intensive real-time applications.

 The single-threaded event loop handles multiple operations concurrently, improving performance.

 Can be used for a wide range of applications, from simple APIs to complex server-side rendering.

Node.js has fundamentally changed the landscape of server-side programming by allowing developers to write server-side scripts in JavaScript. Built on the V8 JavaScript engine, Node.js is efficient, lightweight, and highly performant, making it ideal for building scalable network applications.

 Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. It can handle multiple connections concurrently without creating new threads for each connection.

 Developers can use JavaScript on both the client and server sides, simplifying the development process and fostering better code reusability.

 NPM provides access to thousands of reusable packages, which can significantly speed up development.

To make building server-side applications even more efficient, several frameworks have been developed for Node.js. Here are some of the most popular ones:

 Express is a minimalistic and flexible Node.js web application framework that provides a robust set of features to develop web and mobile applications.

 Middleware system, routing, integration with various view engines, and a large ecosystem of plugins.

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

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

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

 Created by the same team behind Express, Koa aims to be a smaller, more expressive, and more robust foundation for web applications and APIs.

 Uses modern JavaScript features like async/await to improve readability and robustness, and a modular structure that provides more control.

const Koa = require('koa');
const app = new Koa();

app.use(async ctx => {
  ctx.body = 'Hello, World!';
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

 A progressive Node.js framework for building efficient, reliable, and scalable server-side applications. It uses TypeScript by default.

 Modular architecture, dependency injection, and support for various transports including HTTP, WebSockets, and microservices.

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  imports: [],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

 Hapi is a rich framework for building applications and services. It is designed for building robust and scalable applications with a focus on configuration-driven development.

 Input validation, authentication, caching, and error handling.

Deno is a modern JavaScript and TypeScript runtime built on the V8 engine, the same engine that powers Node.js, but it offers several unique features and improvements over Node.js. It was created by Ryan Dahl, the original developer of Node.js, to address some of the limitations and shortcomings he identified in Node.js.

 Deno has first-class TypeScript support out of the box, without the need for additional configurations or compilers.

 Deno is secure by default. It runs in a sandboxed environment, and requires explicit permission to access files, networks, and environment variables.

 Deno includes a built-in standard library, which eliminates the need for a separate package manager.

 Deno uses ES module syntax and supports URLs for importing modules, eliminating the need for a centralized package manager like npm.

Deno supports importing modules directly from URLs, and has a decentralized repository system. The Deno community has created a wide range of modules and libraries, similar to npm packages in Node.js.

Oak is a popular middleware framework for Deno, similar to Koa for Node.js. It provides robust routing and middleware capabilitie

import { Application, Router } from "https://deno.land/x/oak@v10.5.1/mod.ts";

const router = new Router();
router.get("/", (context) => {
  context.response.body = "Hello from Oak!";
});

const app = new Application();
app.use(router.routes());
app.use(router.allowedMethods());

console.log("Server running at http://localhost:8000/");
await app.listen({ port: 8000 });

Its a way for two or more softwares to communicate

Develop and consume RESTFUL APISs or GraphQL APIs

 or ws for webSockets to enable real time communication.

Token-based: JSON Web Tokens(JWT) with jsonwebtoken.

OAuth integration using libraries like passport.js.

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