Fate is a modern React data framework created by Christoph Nakazawa designed to optimize data fetching and state management for applications built with Async React. Drawing inspiration from Relay and GraphQL, it shifts the focus from request-centric data handling to a declarative view-based architecture. The framework is built to eliminate imperative cache invalidation and complex mutation patching by composing data requirements directly into React components. By caching normalized objects, Fate ensures consistent client state and enables highly efficient UI updates across complex component trees.

The tool enables developers to co-locate data requirements within components using views, which are then composed into a single request per screen at the application root. It leverages modern React features such as Suspense, Actions, and the use hook to provide a seamless development experience. Through a normalized cache, Fate supports precise optimistic updates and real-time synchronization via Server-Sent Events (SSE). The framework abstracts away the complexities of manual cache management and request waterfalls, providing a type-safe and predictable way to fetch, subscribe to, and mutate application data.

Some of the key features are:

• View Composition: Allows components to declare their specific data requirements, which the framework aggregates into optimized, minimal network requests.
• Data Masking: Enforces strict data selection for each view, preventing over-fetching and accidental coupling between components.
• Normalized Caching: Caches data as normalized objects rather than entire requests, ensuring data consistency across the UI and efficient garbage collection.
• Live Views: Provides built-in support for real-time updates via Server-Sent Events (SSE) with minimal configuration.
• Async React Integration: Designed from the ground up for modern React features like Suspense and Actions, enabling instant optimistic UI updates and automated rollbacks.
• Vite Plugin: Automates type generation, replacing the need for manual CLI-based codegen steps and simplifying development workflows.
• Flexible Transport Layer: Supports various backends including Drizzle, Prisma, and custom HTTP/tRPC implementations.

Fate is used by defining View objects that describe the data shape required by a component. Developers use hooks like useView or useLiveView to consume these data requirements within functional components. At the application root, the useRequest hook collects these view specifications to perform an aggregated fetch. Data mutations are handled through standard React Action patterns, where Fate manages the cache updates automatically. The framework includes a Vite plugin that monitors server API changes and updates types automatically, ensuring the client-side code remains type-safe and synchronized with the backend.

Some common use cases include:

• Real-Time Dashboards: Building interfaces that require live synchronization, such as tracking post likes or comment additions in real-time without refreshing pages.
• Data-Driven Applications: Developing complex applications that rely on consistent, normalized data structures across deeply nested component hierarchies.
• Optimistic UI Development: Implementing interactive features like "like" buttons or status toggles that provide immediate user feedback through optimistic UI updates.
• Scalable React Architectures: Creating stable, maintainable applications where data fetching is decoupled from component UI logic, simplifying long-term maintenance.