Overview

Express.js, often simply referred to a Express, is a popular web application framework for Node.js. It simplifies the process of building web applications and APIs, offering a wide range of features and tools to make development efficient and scalable. In this comprehensive guide, we will explore Express.js concepts, enabling you to become proficient in building web applications with Node.js.

What is Express.js?

Express.js is a minimal and flexible Node.js web application framework designed to make building web applications and APIs easier. It is built on top of Node.js and provides a robust set of features for web and mobile applications. Some of the core features include:

Middleware:

Express uses middleware functions to perform tasks during the request-response cycle. Middleware functions can be used for tasks such as authentication, data validation, and error handling.

Routing:

Express allows you to create modular and organized routes for handling various HTTP requests (GET, POST, PUT, DELETE, etc.).

Template Engines:

Although Express does not include a templating engine itself, it is often used with popular templating engines like EJS or Handlebars to render dynamic content.

Error Handling:

Express simplifies error handling by allowing you to define error-handling middleware that can be used for catching and processing errors.

Server Creation:

Express provides a simple and effective way to create HTTP servers for your web applications

Database Integration:
You can easily integrate Express with databases, whether you are using SQL databases like MySQL or NoSQL databases like MongoDB.