reduxjs/redux

Redux — the predictable global state-management library that taught a generation of JS developers about reducers, actions, and immutable state. Still widely used; complemented by Redux Toolkit as the modern way to use it.

What it is

A TypeScript library that codifies a unidirectional data-flow pattern: state lives in a single store, actions are plain objects describing intent, reducers are pure functions that produce next state from previous state + action. Inspired by Elm + Flux. Redux Toolkit (RTK) is the canonical modern API that hides the verbosity Redux became known for.

Key features

• Single store, immutable state, pure reducers.
• Middleware system (redux-thunk, redux-saga, RTK Query).
• Time-travel debugging via Redux DevTools.
• Redux Toolkit — the modern API with reducer generation, async thunks, RTK Query.
• TypeScript types bundled.
• MIT-licensed.

Tech stack

• TypeScript primary.
• npm packages: redux, @reduxjs/toolkit, react-redux.

When to reach for it

• You're maintaining an existing Redux codebase.
• You want predictable, time-travel-debuggable state.
• You're building large apps where the structure pays off.

When not to reach for it

• You're starting fresh and want lighter — Zustand, Jotai, TanStack Query for most use cases.
• Simple app — plain useState / useReducer is enough.

Maturity signal

61k stars, 15k forks, MIT, actively maintained. 10+ years.

Alternatives

• Zustand — lighter modern alternative.
• TanStack Query — for server state specifically.
• Jotai — atom-based.

Tags

javascript, typescript, react, state-management, library, mit-license, redux