What is Express.js?A web application framework for Node.jsA programming languageA database management systemA front-end development tool

What is Express.js?

Express.js is a web application framework for Node.js, designed for building web applications and APIs. It provides a robust set of features for web and mobile applications, making it easier to manage routing, middleware, and handling requests and responses. It is minimal and flexible, allowing developers to create applications with a wide array of functionalities without needing to delve deep into the underlying mechanics of Node.js.

Key Features of Express.js:

1. Middleware support: It allows you to define middleware functions for handling requests, making it modular and easy to maintain.
2. Routing capabilities: Express.js enables developers to define routes and manage various HTTP methods effortlessly.
3. Integration: It can easily integrate with other packages from the Node.js ecosystem, such as databases or templating engines.
4. Performance: Built on Node.js, it benefits from its non-blocking I/O model, which means it can handle many connections simultaneously.

In summary, Express.js is a powerful framework geared towards web development with Node.js, making it a preferred choice for many developers in the field.