Express.js is a minimal and flexible web application framework for Node.js . It provides a robust set of features for building powerful web applications and APIs, effectively streamlining core Node.js capabilities. Express simplifies HTTP requests, responses, routing, and middleware management, making server-side development with JavaScript faster and more organized.
Routing in Express.js defines how an application responds to incoming HTTP requests at specific paths (URIs) and methods. This flexible system allows developers to create simple routes, complex patterns, dynamic parameters, multiple handlers, and modular route structures using Router. This article explains all essential routing concepts—from basic paths to regex routes, route parameters, middleware-style handlers, app.route(), and express.Router.
Routing در Express.js تعیین میکند که برنامه چگونه به درخواستهای HTTP در مسیرهای مختلف پاسخ دهد. این سیستم قدرتمند و انعطافپذیر امکان تعریف مسیرهای ساده، الگوهای پیچیده، پارامترهای پویا، چندین هندلر، و ساختارهای ماژولار مبتنی بر Router را فراهم میکند. این مقاله تمام مفاهیم کلیدی Routing—از مسیرهای ساده تا Regex، پارامترها، middleware، app.route() و express.Router—را بهصورت کامل و کاربردی توضیح میدهد.
Middleware is one of the core architectural concepts in Express.js. . Middleware functions have access to the request object (req), the response object (res), and the next() function, which controls the flow of the request–response cycle. Middleware can modify requests, send responses, validate data, log activity, handle errors, or pass control to the next function in the stack. This article explains everything you need to know about writing middleware—from simple examples to async validation, error handling, and configurable middleware.
Using Middleware in Express.js: A Complete and Practical Guide
Overriding the Express API and Using Template Engines
Advanced Express.js: Overriding the API, Template Engines, Debugging, and Working Behind Proxies
Express.js does not include built‑in database support, but its flexibility allows you to connect it to virtually any database system simply by installing the appropriate Node.js driver. This article provides a complete overview of how to integrate Express with many popular SQL and NoSQL databases, including installation commands and example usage.
