Master Apollo Client with the Enriched Editor
Queries, mutations, cache, Suspense, testing, and performance. Monaco-powered editor with TypeScript, interactive examples, and verify—learn by building real GraphQL apps.
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Apollo 1: Queries & useQuery
useQuery is the primary hook for fetching data in Apollo Client. It returns loading, error, and data...
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Apollo 2: Variables & Dynamic Queries
GraphQL variables let you parameterize queries. Pass them via the variables option in useQuery to bu...
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Apollo 3: Fragments & Composition
Fragments let you define reusable sets of fields that can be shared across multiple queries and muta...
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Apollo 4: Mutations & Optimistic UI
useMutation is how you send writes to your GraphQL server. Combine it with optimisticResponse to mak...
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Apollo 5: Fetch Policies
Apollo's fetchPolicy controls where data comes from — cache, network, or both. The right choice depe...
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Apollo 6: Cache Read & Write
Apollo's cache is not just automatic — you can read from and write to it directly using readQuery, w...
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Apollo 7: Type Policies
Type policies let you customize how Apollo normalizes, stores, and reads specific types in the cache...
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Apollo 8: Reactive Variables
Reactive variables are Apollo's solution for local state — like React Context, but integrated with t...
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Apollo 9: Cache Invalidation
Cache invalidation is famously hard. Apollo gives you evict, gc, refetchQueries, and resetStore to k...
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Apollo 10: Pagination
fetchMore is Apollo's built-in pattern for pagination. Combined with type policy merge functions, it...
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Apollo 11: Error Handling & Links
Apollo Links form a chain that processes each GraphQL operation. ErrorLink, RetryLink, and custom li...
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Apollo 12: Suspense Hooks
Apollo 3.8+ introduces Suspense-compatible hooks: useSuspenseQuery, useBackgroundQuery, and useLoada...
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Apollo 13: Subscriptions & Polling
For real-time data, Apollo offers subscriptions (WebSocket-based), subscribeToMore (add real-time up...
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Apollo 14: Testing Apollo
MockedProvider lets you test Apollo components without a real server. Define mock responses for your...
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Apollo 15: Performance Optimization
Apollo offers several performance tools: @defer for incremental delivery, BatchHttpLink for request ...
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Apollo 16: Custom Hooks
Wrapping Apollo hooks in custom hooks lets you encapsulate query logic, add type safety, and create ...
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Apollo 17: Schema-Driven Development
Schema-driven development means designing your GraphQL schema first, then generating TypeScript type...
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Apollo 18: Local State Management
Apollo can manage local state alongside remote data using type extensions, local resolvers, and the ...
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Apollo 19: Authentication Patterns
Authentication in Apollo is handled via the link chain. SetContextLink adds auth headers, token refr...
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Apollo 20: File Uploads
GraphQL file uploads use the multipart request spec. Apollo supports uploads via createUploadLink, w...
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Apollo 21: DevTools & Debugging
Apollo DevTools lets you inspect the cache, watch queries in flight, and debug GraphQL operations in...
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Apollo 22: SSR with Next.js
Apollo Client integrates with Next.js App Router via server-side queries in RSC, ApolloNextAppProvid...
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Apollo 23: Offline Support
Apollo can work offline using apollo-cache-persist for cache storage, optimistic mutations for offli...
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Apollo 24: Real-Time Architecture
Real-time data is a spectrum from polling (simplest) to subscriptions (most real-time) to live queri...
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Apollo 25: Production Checklist
Going to production with Apollo requires APQ for bandwidth, CDN caching for performance, error monit...
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