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Express.js, commonly referred to as Express, is a fast and flexible web application framework for Node.js. It provides a minimalistic and straightforward approach to building web applications and APIs. Express.js is known for its simplicity, versatility, and a vast ecosystem of middleware and extensions, making it one of the most popular choices for developing server-side applications with Node.js.

Key features and characteristics of Express.js include:

Minimalist and Unopinionated: Express.js is designed to be a lightweight and unopinionated framework, allowing developers the freedom to structure their applications according to their preferences and needs.

Middleware: Express.js leverages middleware, which are functions that handle requests and responses, to perform various tasks such as logging, authentication, data parsing, and error handling. Middleware functions can be custom-built or obtained from a wide range of existing libraries, making it easy to extend and enhance the functionality of your application.

Routing: Express.js provides a simple and intuitive way to define routes for handling different HTTP methods (e.g., GET, POST, PUT, DELETE) and URL patterns. This allows developers to organize their application's logic efficiently and respond to specific requests accordingly.

Templating Engines: Express.js can work with various templating engines (e.g., EJS, Pug, Handlebars) to dynamically generate HTML pages on the server-side, facilitating the creation of dynamic web applications.

Robust HTTP Utility Methods: Express.js provides a set of HTTP utility methods that make it easy to interact with HTTP requests and responses, handle cookies, manage sessions, and more.

Middleware and Extension Ecosystem: Express.js benefits from a vast ecosystem of middleware and extensions available through NPM (Node Package Manager). Developers can easily integrate third-party modules to enhance their application's functionality without having to reinvent the wheel.

RESTful API Development: With its flexible routing and middleware system, Express.js is a popular choice for building RESTful APIs, enabling developers to create scalable and maintainable backend services.

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