XState
A JavaScript/TypeScript library for managing app and workflow logic with state machines and actors.
- Stars
- 30.4k
- Forks
- 1.4k
- Licence
- MIT
- Language
- TypeScript
- Last update
- 4 days ago
- Type
- Library
What it is
XState is a library for managing state in JavaScript and TypeScript apps, on the frontend or backend. You describe how your logic moves between states and reacts to events, using state machines, statecharts, and actors, so the behavior is predictable and can be visualized. The README says it has zero dependencies. A smaller companion package, @xstate/store, offers simple event-based state management for cases that don't need full machines.
- Model a multi-step checkout or form flow as a state machine with explicit transitions
- Run an actor that holds state and responds to events sent to it
- Subscribe to state changes to update a UI or log transitions
- Use the Stately Studio editor to design a machine visually and export it to XState v5
Great for
- Frontend developers managing complex UI flows with many interacting states
- Teams modeling multi-step workflows or processes in backend code
- Developers who want state logic that can be drawn as a diagram
- Developers using React, Vue, or Svelte who want a state-machine approach
Not ideal for
- Simple apps with only a few pieces of state, where a basic store or plain variables are enough, since the concepts add overhead
- Readers new to programming, since it assumes familiarity with JavaScript/TypeScript and state modeling
How to get it
- 1
Install with a package manager
You'll need: Node.js
Install the xstate package
npm install xstate - 2
Run it
- Install the package with npm install xstate
- Define a machine with createMachine, listing its states and transitions
- Create an actor with createActor(machine) and call start()
- Send events with actor.send({ type: 'EVENT_NAME' }) and watch state changes via subscribe
- 3
Get the most out of it
- Use the Stately Studio editor (state.new) to design machines visually and export them to XState v5
- Try the official templates for vanilla TypeScript, React, Vue, or Svelte on CodeSandbox or StackBlitz
- Use @xstate/store for simple state and move to full machines when logic grows
- Browse the examples folder in the repository for working patterns
- Install the Stately VS Code extension to work with machines in your editor
Downloads
Strengths
- The README states it has zero dependencies
- Models logic as explicit states and events, which can make behavior easier to reason about
- Has a visual editor (Stately Studio) and a VS Code extension for working with machines
Trade-offs
- Concepts such as statecharts and actors have a learning curve for developers unfamiliar with them
- The README does not detail performance or bundle size, so those should be checked separately
- Overkill for very simple state needs, as the README itself notes with its separate store package
How it compares
| Project | Stars | Type | Level | Updated | Best for |
|---|---|---|---|---|---|
| xstate (this) | 30.4k | Library | intermediate | 4 days ago | Frontend developers managing complex UI flows with many interacting states |
| redux | 61.4k | Library | intermediate | 16 days ago | Developers building larger front-end apps where many components share the same data |
| zustand | 58.9k | Library | beginner | 15 days ago | React developers who want simpler shared state than Redux |
| xyflow | 38.9k | Library | intermediate | 4 days ago | Frontend developers building a flowchart or diagram editor in React |
| vuex | 28.3k | Library | intermediate | 2.1 years ago | Teams maintaining an existing Vue app that already uses Vuex |
| jotai | 21.3k | Library | beginner | 14 days ago | React developers who want simple shared state without heavy setup |
Stats synced from GitHub. The assessment above was drafted with AI from the project's README on 2026-10-29 and may miss recent changes — check the README before relying on a command. MIT licence: free to use, modify and distribute, including commercially, as long as you keep the copyright notice.