Expressjs

Founded 2010

Build web servers and backend application programming interfaces with Node

Pricing model

Free

You can use Express.js to build backend servers, web applications, and programming interfaces using JavaScript on Node.js. It provides a lightweight routing system that maps incoming HTTP requests to specific server functions. You can manage request and response pipelines using modular middleware components for parsing request bodies, authenticating users, managing sessions, and handling errors. It simplifies creating RESTful services, serving static files, and connecting databases without hiding the core networking capabilities of the Node runtime environment, keeping your server architecture straightforward and fast.

What Expressjs does

Define HTTP route handlers for GET, POST, PUT, and DELETEAttach middleware functions to inspect and modify incoming requestsParse incoming JSON payloads and URL-encoded query stringsSend JSON responses with custom HTTP status codesConfigure static file directories to serve public assetsCatch server-side errors and return formatted error messagesManage HTTP cookies and user session headersLightweight URL routing for HTTP methodsMiddleware pipeline for request and response handlingServing static assets like images and HTML pagesTemplate engine integration for rendering dynamic HTMLHTTP utility methods and status code helpersMinimal abstraction over standard Node.js HTTP modulesExtensive third-party plugin ecosystem via npm