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  3. Backend

Backend

Server-side frameworks for building APIs and apps.

Node.js

A JavaScript runtime built on Chrome's V8 engine, letting developers write server-side code in the same language used in the browser.

Backend
Free
Open Source
javascriptruntimeserver
Official site Docs

Express

A minimal, unopinionated web framework for Node.js used to build APIs and web servers with a thin layer of routing and middleware.

Backend
Free
Open Source
nodejavascriptframeworkapi
Official site

Laravel

A PHP framework with expressive syntax and built-in tooling for routing, ORM, queues, and authentication, aimed at rapid full-stack development.

Backend
Free
Open Source
phpframeworkmvc
Official site Docs

Django

A batteries-included Python web framework that emphasizes fast development with a built-in ORM, admin panel, and security defaults.

Backend
Free
Open Source
pythonframeworkorm
Official site Docs

Flask

A lightweight Python microframework that gives developers just routing and templating out of the box, leaving architecture choices to the app.

Backend
Free
Open Source
pythonmicroframeworkwsgi
Official site

Spring Boot

An opinionated extension of the Spring Framework for Java that removes boilerplate configuration and makes it fast to stand up production-ready services.

Backend
Free
Open Source
javaframeworkenterprise
Official site

ASP.NET

Microsoft's cross-platform framework for building web APIs and applications on .NET, with strong typing and integrated tooling in Visual Studio.

Backend
Free
Open Source
dotnetcsharpframework
Official site

Ruby on Rails

A convention-over-configuration web framework for Ruby that popularized fast, opinionated scaffolding for database-backed applications.

Backend
Free
Open Source
rubyframeworkmvc
Official site Docs

FastAPI

A modern Python web framework for building APIs with automatic OpenAPI docs, async support, and validation driven by type hints.

Backend
Free
Open Source
pythonapiasync
Official site

NestJS

A structured Node.js framework layered on Express or Fastify, bringing Angular-style modules and dependency injection to backend development.

Backend
Free
Open Source
nodetypescriptframework
Official site Docs

Go Fiber

An Express-inspired web framework for Go built on the fasthttp engine, favoring low overhead and a familiar routing API.

Backend
Free
Open Source
goframeworkperformance
Official site Docs