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React (software)

React (also known as React.js or ReactJS) is a free and open-source front-end JavaScript library that aims to make building user interfaces based on components more "seamless". It is maintained by Meta (formerly Facebook) and a community of individual developers and companies. According to the 2025 Stack Overflow Developer Survey, React is one of the most commonly used web technologies. React can be used to develop single-page, mobile, or server-rendered applications with frameworks like Next.js and React Router. Because React is only concerned with the user interface and rendering components to the DOM, React applications often rely on libraries for routing and other client-side functionality. A key advantage of React is that it only re-renders those parts of the page that have changed, avoiding unnecessary re-rendering of unchanged DOM elements. React is used by an estimated 6% of all websites.

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Article table of contents 24 sections

1 Features

1.1 Declarative

1.2 Components

1.3 Function components

1.4 React Hooks

1.4.1 Rules of hooks

1.5 Server components

1.6 Class components

1.7 Routing

1.8 Virtual DOM

1.8.1 Updates

1.9 Lifecycle methods

1.10 JSX

1.11 Architecture beyond HTML

1.12 Server-side rendering

2 Common idioms

2.1 Unidirectional data flow

3 History

4 Licensing

5 See also

6 Notes

7 References

8 Bibliography

9 External links

Categories

2015 softwareAjax (programming)Facebook softwareJavaScript librariesSoftware using the MIT licenseWeb applications

Internal Wikipedia links

.NET 2020 Facebook ad boycotts 2021 Facebook leak 2021 Facebook outage AIDA/Web API ASP.NET ASP.NET AJAX ASP.NET Core ASP.NET Dynamic Data ASP.NET MVC ASP.NET Razor ASP.NET Web Forms ActionScript Activity stream Adam D'Angelo

External references

github.com github.com github.com github.com github.com github.com react.dev react.dev react.dev reactjs.org reactjs.org reactjs.org

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