Express. What is js?..!!!

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Express.js (or Express for short) is the most popular Web Application Framework for Node.js.

💡 What are Express.js?

Express.js is the top-of-the-line layer of Node.js that makes building web applications and APIs (Application Programming Interface) easier and faster.

It is designed to be a Minimalist Framework (Simple Framework), which means that it only provides essential features and allows you to use "Middleware" or other tools to be assembled according to the project's requirements.

🔑 Main features

Routing (Routing): Manage how the Server will respond to HTTP requests (such as GET, POST, PUT, DELETE) at different URLs.

Middleware: It is a function that can access the Request object (req), Response (res), and the next function in the Request-Response cycle. It is used for tasks such as logging, Session management, Authentication, and Body management of Request (such as JSON).

Template Engines: Supports a variety of Template Engines, making it easy to create dynamic web pages (although Express is used more often to create APIs, which do not require a Template Engine).

High Performance: Because it runs on Node.js, which uses Google Chrome's V8 JavaScript Engine and is Non-blocking I / O (Input / Output), Express has the ability to handle large numbers of requests simultaneously quickly.

🤝 Relationship with Node.js

Express.js can't run without Node.js

Node.js is the Runtime Environment that allows you to run JavaScript outside the web browser and is the basis of the Server.

Express.js is a tool that specifically enhances the ability of Node.js to create Web Server, making writing code for Server-Side much easier compared to using Node.js' original HTTP module.

🌍 Easy summary (The MEAN / MERN Stack)

Express.js is an integral part of the highly popular group of so-called "Stack" technologies:

MEAN Stack: MongoDB, Express.js, Angular, Node.js

MERN Stack: MongoDB, Express.js, React, Node.js

Express.js is often used as the "Backend" section to deal with business logic, database connections, and data services through APIs.