Still the most widely deployed UI library in the industry - the ecosystem, tooling, and hiring pool around it are unmatched.
Where react fits, based on its real tags and topics.
git clone https://github.com/facebook/react.gitSee the repository's README for language-specific setup steps.
React · [](https://github.com/facebook/react/blob/main/LICENSE) [](https://www.npmjs.com/package/react) [](https://github.com/facebook/react/actions/workflows/runtime_build_and_test.yml) [](https://github.com/facebook/react/actions/workflows/compiler_typescript.yml) [](https://legacy.reactjs.org/docs/how-to-contribute.html#your-first-pull-request)
React is a JavaScript library for building user interfaces.
* **Declarative:** React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug. * **Component-Based:** Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep the state out of the DOM. * **Learn Once, Write Anywhere:** We don't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.
Category: 🎨 Frontend
Difficulty: Intermediate
Part of: Frontend Essentials, Open Source Essentials
“The most widely adopted framework for chaining LLM calls, tools, and retrieval into real applications - a near-default starting point for RAG and agent projects.”
The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.
“A genuinely open-source Firebase alternative - real Postgres underneath, with auth, storage, and realtime built in rather than a proprietary database.”
The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents
“The cleanest way to wire streaming LLM responses into a React/Next.js UI - handles the hard parts (streaming, tool calls, edge runtimes) so you don't have to.”
“The official, minimal-overhead client for OpenAI's API - the right starting point before reaching for a bigger framework.”
“The most approachable of the major frontend frameworks - official docs and tooling are exceptionally well designed for newcomers.”
“The default choice for production React today - server components, file-based routing, and first-class deployment story make it the fastest path from idea to shipped app.”
“Utility-first CSS that's become the default styling approach for new projects - fast to write, easy to keep consistent, no dead CSS to prune later.”
“Compiles away most of its own runtime, so shipped bundles are smaller and components read closer to plain HTML/JS/CSS than any mainstream alternative.”
“A batteries-included framework rather than a library - trades some flexibility for a consistent, well-documented way to structure large applications.”
“Changed how a generation of React developers think about component libraries - you copy the code into your own project instead of installing a black-box dependency, so you own and can modify every line.”
“The industry-standard container orchestrator - not always necessary at small scale, but the default assumption for any serious cloud-native platform team.”
“The most capable open-source relational database available - strong standards compliance, extensions for nearly everything (including full-text search and vectors), and a default choice for good reason.”
“Unifies dozens of LLM providers behind a single API, making model switching almost effortless in production.”
“The standard library for working with open-weight models - thousands of pretrained models are one line of code away.”
“The modern default frontend build tool - native ESM in dev means a dev server that starts and reloads almost instantly, even on large apps.”
“The open-source engine behind Docker - understanding containers here pays off no matter which orchestrator sits on top later.”
