Express.js is a framework that runs on top of Node.js and makes it practical to build web servers and APIs. Node.js on its own gives you the ability to handle HTTP requests, but it leaves almost everything else up to you - how to route requests to the right function, how to parse request bodies, how to send responses, how to handle errors. Express provides clean, simple answers to all of these questions without forcing a particular project structure or making decisions the application should make itself.
The core concept in Express is middleware - functions that run in sequence when a request comes in. A request arrives, passes through a logging function that records it, then through an authentication function that checks whether the user is allowed to proceed, then through a validation function that checks whether the request data is correct, and finally reaches the handler function that actually does the work and sends a response. This chain is easy to understand, easy to test, and easy to modify. Adding a new behaviour to every request is a matter of adding one function to the chain.
Express is deliberately minimal. It does not tell you how to connect to a database, how to structure your files, or how to manage configuration. These decisions belong to the application, not the framework, because different applications have different requirements. We make these decisions deliberately on each project - layering the code in a way that keeps routing, business logic, and data access cleanly separated. The result is a codebase that is easy to navigate and easy to change as requirements evolve.
What this means for your product:
- A clean, well-structured API that is easy for any engineer to navigate
- Request handling that is predictable and easy to follow from entry to response
- Authentication, validation, and error handling applied consistently across every endpoint
- A backend that is easy to extend as the product grows
Chips:
Express.js · REST APIs · Middleware · Routing · Error Handling · TypeScript · Validation
