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Valtio State

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Simplifies proxy-state management for React and Vanilla JavaScript applications.

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Tracked since2026
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The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Easy to learn and use

Biggest con

Relies on a Proxy object, which may have compatibility issues with older JavaScript environments or specific polyfills.

TL;DR - Valtio State

  • Simplifies state management using JavaScript Proxies.
  • Enables direct mutation of state objects for updates.
  • Automatically triggers UI re-renders in React and Vanilla JS.
Pricing: Free forever
Best for: Individuals & startups

What is Valtio State?

Editorial review
Valtio is a state management library designed to make working with proxy-based state straightforward and efficient. It allows developers to create mutable state objects that automatically trigger re-renders in UI frameworks like React when their properties are modified. This approach simplifies state updates by directly modifying the state object rather than relying on immutable updates or dispatching actions. The library is particularly beneficial for developers building interactive web applications with React or plain JavaScript who are looking for a less verbose and more intuitive way to manage application state. Its core value lies in reducing boilerplate code and making state logic easier to read and write, especially for complex or deeply nested state structures. By leveraging JavaScript Proxies, Valtio provides a reactive programming model where changes to state are automatically observed and reflected in the UI.

Available on: Web

Pros & Cons

Pros

  • Easy to learn and use
  • Reduces boilerplate for state updates
  • Intuitive direct mutation of state
  • Performant due to proxy-based reactivity

Cons

  • Relies on a Proxy object, which may have compatibility issues with older JavaScript environments or specific polyfills.
  • The `useSnapshot` hook creates a shallow copy of the state, meaning nested object mutations within the snapshot will not trigger re-renders unless the parent object reference changes.
  • Debugging can be more complex compared to immutable state management, as direct mutations to the proxy might make it harder to track state changes over time without additional tooling.

Key Features

Proxy-based state creationDirect state mutationAutomatic UI re-rendering (React, Vanilla JS)Snapshot mechanism for consistent rendersMinimal boilerplate code

Pricing

Free

Valtio State is completely free to use with no hidden costs.

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Valtio State FAQ

How does Valtio handle state updates for deeply nested objects or arrays within a proxy?

Valtio uses proxies to wrap the state object. When you modify a property, even within a deeply nested structure, the proxy detects the change and triggers a re-render for components observing that state. This ensures reactivity without needing immutable updates.

Can Valtio state be used outside of React components, for example, in a vanilla JavaScript environment?

Yes, Valtio is designed to work with both React and vanilla JavaScript. You can create and modify proxy states directly in plain JavaScript, and the state changes will be reflected wherever the state is being observed.

What is the purpose of the `useSnapshot` hook in Valtio, and when should it be used?

The useSnapshot hook creates a read-only snapshot of the proxy state for use within a React component. This snapshot ensures that the component re-renders only when the observed parts of the state change, optimizing performance by preventing unnecessary re-renders.

How does Valtio ensure that state mutations are traceable and debuggable?

Valtio's proxy-based approach allows for easy integration with developer tools. Because all state modifications go through the proxy, it's possible to intercept and log these changes, making debugging and understanding state flow more straightforward.

Is it possible to integrate Valtio with other state management libraries or patterns, such as Redux or Zustand?

Valtio is designed to be a standalone state management solution, but its simple proxy-based nature allows it to coexist with other libraries. You can use Valtio for local component state or specific features while maintaining a global store with another solution if needed.

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