XState

State machines and statecharts for the modern web.

XState brings the rigor of finite state machines and statecharts to JavaScript and TypeScript applications, making complex UI logic predictable and testable. Rather than scattered boolean flags and ad-hoc conditionals, state and transitions are declared in a single, self-documenting machine definition that can be visualized in the Stately editor. XState supports nested states, parallel states, guards, actions, and invoked services for orchestrating asynchronous workflows. The actor model enables communication between independent state machines across your application. With full TypeScript integration, auto-complete in IDEs for transition events, and compatibility with React, Vue, Svelte, and vanilla JavaScript, XState brings industrial-grade state management patterns to every frontend stack.