What is Express.js?
Turkish: Express.js
Express.js is a Node.js framework that simplifies routing, middleware, and HTTP response handling for web applications and APIs.
What is Express.js?
Express.js is a minimal backend framework that runs on Node.js. It makes HTTP servers, URL routes, request handling, and responses easier to structure than working directly with Node’s lower-level APIs.
How Does It Work?
An Express application is built from routes and middleware chains. A route maps an endpoint such as GET /products or POST /login to the function that should handle it. Middleware runs before or around routes and is used for authentication, logging, JSON parsing, CORS, request validation, and error handling.
Express does not prescribe a database, file upload system, or session strategy. Teams can combine it with PostgreSQL, MongoDB, Redis, JWT, Passport.js, or other libraries depending on the project.
Business Use
Express.js is common for REST APIs, admin panels, webhook receivers, small microservices, and prototype backends. It is quick to learn, has a large ecosystem, and works naturally with existing Node.js packages.
As a project grows, folder structure, error standards, input validation, testing, and observability become important. Express gives flexibility; the team still needs to define the application architecture.