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Relay

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What Relay is

Relay is a free GraphQL client for React that gathers components’ data requirements into optimized queries that can be prepared in advance. Components declare the data they need, and Relay consolidates those needs, including duplicate fields. Its normalized data store keeps components observing the same data in sync. For interface work, it supports loading states, pagination, refetching, optimistic updates, and rollbacks when mutations fail. Queries can defer some data and progressively render as more arrives. Relay generates TypeScript types for GraphQL snippets and provides editor support for schema autocompletion and go-to-definition. Developers can configure its network layer for HTTP, WebSockets, authentication, caching, telemetry, or form-data uploads. Relay requires GraphQL, a Babel plugin, and the Relay Compiler; production guidance recommends running the compiler in CI and keeping generated artifacts in source control. Documentation covers setup with React, Vite, TypeScript, and Babel, as well as React Native. The homepage says it works out of the box with Create React App and Next.js. Relay recommends persisted queries to restrict clients to queries fixed at build time.

Who it suits

It suits React developers building GraphQL applications who want generated types, a shared normalized data store, and built-in interface patterns. Teams need to be prepared to use GraphQL, Babel, and the Relay Compiler.

What it does well

  • Combines component data needs into optimized queries
  • Normalized store keeps observed data in sync
  • Supports optimistic updates and rollbacks
  • Generates TypeScript types and editor support

What to know first

  • Requires GraphQL
  • Requires a Babel plugin and Relay Compiler
  • Production guidance calls for CI compilation and tracked artifacts

Limits

Relay requires GraphQL plus Babel and the Relay Compiler. Its server-side conventions include GraphQL Connections when available and globally unique object IDs for caching and refetching.

Getting started

  1. Open the Relay website and prepare a React project
  2. Add GraphQL, Babel, and the Relay Compiler
  3. Configure Relay with React, Vite, TypeScript, or supported tooling
  4. Set up the network layer for HTTP, WebSockets, and authentication
  5. Define component GraphQL data requirements
  6. Run the Relay Compiler and keep generated artifacts in source control

Verdict

Relay offers query generation, data consistency, and interface features for React applications using GraphQL. Its setup requires GraphQL, Babel, and the Relay Compiler; persisted queries are recommended for restricting client queries.

Questions

Is Relay free?

Yes. Relay is listed with a free pricing model and a free plan.

Which platforms does Relay support?

The listing names Android, iOS, and web. Documentation also covers React Native.

What languages can Relay servers use?

Listed server languages are JavaScript, TypeScript, and Flow.

Does Relay generate client code?

Yes. It generates Flow or TypeScript types for GraphQL snippets, and client code generation is listed.

Which integrations are documented?

The quick start documents React, Vite, TypeScript, Babel, and the Relay Compiler.

How can Relay network requests be customized?

The network layer can use HTTP or WebSockets, application authentication, caching, telemetry, and form-data uploads.

Facts from Relay's own pages

Built-in UI patterns
Relay supports loading states, pagination, refetching, optimistic updates, and rollbacks. · relay.dev, 2 Oct 2026
Company and project
The site identifies Meta Platforms, Inc. in its copyright notice and says Relay was built in tandem with GraphQL and is used at Facebook scale. · relay.dev, 2 Oct 2026
Data consistency
Relay maintains a normalized data store so components observing the same data stay in sync. · relay.dev, 3 Oct 2026
Declarative data
Components declare the data they need, and Relay generates queries to fetch it. · relay.dev, 3 Oct 2026
Editor support
Relay editor support provides GraphQL schema autocomplete and go-to-definition. · relay.dev, 3 Oct 2026
Generated types
Relay generates TypeScript types for GraphQL snippets, and the homepage also describes generated Flow or TypeScript types. · relay.dev, 3 Oct 2026
Integrations
The quick start documents setup with React, Vite, TypeScript, Babel, and the Relay Compiler. · relay.dev, 3 Oct 2026
More features
Relay includes loading states, pagination, refetching, optimistic updates, rollbacks, and streamed or deferred data. · relay.dev, 3 Oct 2026
Mutations
Relay supports optimistic updates, error handling, and automatically reverting optimistic changes when mutations fail. · relay.dev, 3 Oct 2026
Network customization
The network layer can be customized for behaviors such as network-level caching, telemetry, or form-data uploads for mutations. · relay.dev, 2 Oct 2026
Network transports
Developers can configure HTTP, WebSockets, and application-appropriate authentication through Relay's network layer. · relay.dev, 2 Oct 2026
Optimizations
Relay aggregates and optimizes component data requirements, including deduplicating identical fields for efficient GraphQL requests. · relay.dev, 3 Oct 2026
Product
Relay is a GraphQL client for React that coordinates component data needs into efficient, pre-loadable queries. · relay.dev, 3 Oct 2026
Production setup
The production guide recommends running the Relay Compiler in CI and keeping generated artifacts in source control. · relay.dev, 2 Oct 2026
React Native
The official documentation says Relay also works with React Native. · relay.dev, 3 Oct 2026
Requirements
Relay requires GraphQL; its homepage says users need a Babel plugin and must run the Relay Compiler. · relay.dev, 3 Oct 2026
Scale
The homepage says Relay is used in Facebook infrastructure across tens of thousands of components and has full-time staff working to improve it. · relay.dev, 3 Oct 2026
Security guidance
Relay recommends persisted queries, also called trusted documents, to restrict clients to queries locked in at build time. · relay.dev, 2 Oct 2026
Server conventions
Relay provides first-class support for GraphQL Connections when the server supports them and relies on globally unique object IDs for caching and refetching. · relay.dev, 3 Oct 2026
Shared state
Relay maintains a normalized data store that keeps components observing the same data in sync. · relay.dev, 2 Oct 2026
Streaming
Relay can defer parts of a query and progressively re-render the UI as data streams in. · relay.dev, 2 Oct 2026
Supported usage
The homepage says Relay works out of the box with Create React App and Next.js, and identifies Flow or TypeScript users as a likely fit. · relay.dev, 3 Oct 2026
Type safety
Relay generates TypeScript types for GraphQL snippets to catch errors statically. · relay.dev, 2 Oct 2026

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