whatisgithub

What is react?

gaearon/react — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2026-06-18

★ 86JavaScriptAudience · developerComplexity · 2/5MaintainedSetup · easy

In one sentence

React is a JavaScript library for building interactive web interfaces out of small reusable components, automatically updating only the parts of the page that change.

Mindmap

mindmap
  root((react))
    What it does
      Builds UI components
      Updates page automatically
      Uses JSX syntax
    Use Cases
      Interactive forms
      Single-page apps
      Mobile and server rendering
    Audience
      Developers
      Companies building apps
    Tech Stack
      JavaScript
      JSX
      npm

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Build a reusable button, card, or navigation menu component and reuse it across a whole app.

USE CASE 2

Create an interactive form where the UI updates automatically as the user types, without manually tracking DOM state.

USE CASE 3

Build a complex single-page app with lots of moving parts while React handles efficient re-rendering.

USE CASE 4

Render the same components on a server or in a mobile app, not just in the browser.

What is it built with?

JavaScriptJSX

How does it compare?

gaearon/reactenergypantry/agent-browser-runtimezhouyoukang1234-spec/windsurf-assistant
Stars868685
LanguageJavaScriptJavaScriptJavaScript
Last pushed2026-06-18——
MaintenanceMaintained——
Setup difficultyeasyhardhard
Complexity2/54/54/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min
No license information was stated in the explanation.

Copy-paste prompts

Prompt 1
I'm new to React. Show me how to break a simple webpage into reusable components using JSX and explain how React updates the page when data changes.
Prompt 2
Write a React component for an interactive form that updates a live preview as the user types, and explain how React decides what to re-render.
Prompt 3
Explain the difference between installing React via npm versus using a CDN link, and show me a minimal starter setup.
Prompt 4
I have a page built with plain HTML and JavaScript. Help me convert one section of it into a React component.

Frequently asked questions

What is react?

React is a JavaScript library for building interactive web interfaces out of small reusable components, automatically updating only the parts of the page that change.

What language is react written in?

Mainly JavaScript. The stack also includes JavaScript, JSX.

Is react actively maintained?

Maintained — commit in last 6 months (last push 2026-06-18).

What license does react use?

No license information was stated in the explanation.

How hard is react to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is react for?

Mainly developer.

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