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React is open-source software under the MIT license. There are no React subscription or usage fees.
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React
React is an open-source JavaScript library for building component-based user interfaces across web applications.
Editorial overview
Aggregated Overview
React provides components, Hooks, client and server rendering APIs, Server Components support, extensive documentation, and a large open-source ecosystem. It is free under the MIT license, but production applications often require separate frameworks, routing, data-fetching, testing, and build tools
This profile combines documented product information and independent evidence where available. It is not a hands-on test unless TechZella explicitly identifies one.
React Decision Snapshot
A quick way to understand who this product may suit, where its limits matter, and which facts are most relevant before you compare alternatives.
Platforms
JavaScript, Node.js, TypeScript, Web
TechZella assessment
8.9/10
Overview
React is an open-source JavaScript library for building user interfaces. It structures applications around reusable components that describe their own appearance and behavior.
Meta released React as open-source software at JSConf US in May 2013. The project uses the MIT license and is developed publicly through its GitHub repository.
React focuses on the user-interface layer rather than providing a complete application stack. Teams commonly add frameworks or libraries for routing, data fetching, authentication, testing, and deployment.
React Features
UI Development
- Declarative component model
- Reusable function and class components
- JSX support
- Component composition
- One-way data flow
State and Logic
- Built-in Hooks
- Local state with useState and useReducer
- Context with useContext
- Refs with useRef
- Effect synchronization with useEffect
Rendering
- Client-side browser rendering through react-dom/client
- Server rendering through react-dom/server
- Static HTML generation
- Browser HTML and SVG component support
- React Server Components support through compatible frameworks and bundlers
Developer APIs
- createContext
- lazy
- memo
- startTransition
- act
- cache
- React Compiler integration
Ecosystem and Integrations
- Next.js App Router
- React Router
- Expo and React Native ecosystem
- Vite
- Parcel
- Rsbuild
Alternatives
Comparable frontend technologies include Vue, Angular, Svelte, and Solid. Vue offers a progressive component framework, Angular provides an integrated application framework, and Svelte compiles components during the build process.
React is also commonly compared with Solid for component-based JavaScript interfaces. The best alternative depends on requirements for framework structure, compilation strategy, ecosystem compatibility, and team expertise.
React Specifications
| Product type | Open-source JavaScript library |
|---|---|
| License | MIT |
| Primary language | JavaScript |
| TypeScript support | Supported through the React ecosystem and type definitions |
| Web rendering package | react-dom |
| Server rendering | Supported through react-dom/server |
| API | React Hooks, components, built-in APIs, directives, and React DOM APIs |
| Integrations | Next.js, React Router, Expo, Vite, Parcel, and Rsbuild |
| Free trial | Not applicable; the software is free and open source |
| Deployment models | Client-side rendering, server-side rendering, static generation, and compatible Server Components architectures |
React Pricing & Plans
Pricing may change. Verify current plans on the vendor's website.
Our evidence-based assessment
TechZella Score
A proprietary editorial score based on product capabilities, usability, value, performance, support and user sentiment evidence.
8.9/10Moderate confidence
React provides components, Hooks, client and server rendering APIs, Server Components support, extensive documentation, and a large open-source ecosystem. It is free under the MIT license, but production applications often require separate frameworks, routing, data-fetching, testing, and build tools.
Methodology v1.0. The assessment weighs feature coverage (25%), ease of use (15%), value for money (20%), performance (15%), support (10%) and user sentiment (15%), using researched product evidence and verified review evidence where available. It is a TechZella editorial assessment, not a direct user-review average.
React Pros & Cons
Pros
- Free and MIT licensed.
- Strong component and Hooks model.
- Supports client, server, and static rendering.
- Works with multiple frameworks and build tools.
- Public documentation and source repository.
Cons
- Doesn't provide a complete application stack alone.
- Requires additional choices for routing and data fetching.
- Server Components need compatible framework or bundler support.
- Tooling and architecture decisions can add complexity.
- Create React App is deprecated for new applications.
Community feedback
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FAQ
Is React a framework?
React describes itself as a JavaScript library for user interfaces. The official documentation recommends pairing it with a framework for many production applications.
Is React free?
Yes. React is open-source software released under the MIT license, with no React subscription or usage fee.
Does React include routing?
No. React does not include a general-purpose router. React projects commonly use React Router or a framework such as Next.js.
Can React render on the server?
Yes. React DOM includes server and static rendering APIs, while Server Components require compatible frameworks or bundlers.
Does React have an API?
Yes. The React package exposes Hooks, components, built-in APIs, and directives. React DOM provides browser, client, server, and static rendering APIs.
Is Create React App still recommended?
The React team deprecated Create React App for new applications in February 2025. The documentation recommends frameworks or build tools such as Vite, Parcel, and Rsbuild instead.