apollographql/apollo-client
Apollo Client
Apollo Client is a GraphQL client library and data fetching framework used to request data from a GraphQL server and synchronize that state within a frontend application. It functions as a remote state manager and a local state management tool, allowing developers to define client-side schemas and resolvers for data that does not reside on a remote server.
The project features a normalized GraphQL cache that identifies objects by ID to ensure referential equality and consistent data updates across different queries. It also includes a GraphQL API mocking tool to simulate server responses and network delays for testing data fetching logic without a live backend.
The framework provides capabilities for server-side rendering and cache hydration to prevent page flickering during load. Its broader feature set covers network request interception, query batching, incremental data delivery, and the synchronization of data state with user interface components.
Features
- Normalized Data Caching - Implements a normalized cache that identifies objects by ID to ensure referential equality across different queries.
- GraphQL Data Fetching - Fetches and synchronizes data from a GraphQL server into a local application state.
- GraphQL Client Frameworks - Provides a complete framework for coordinating GraphQL network requests, intercepting traffic, and managing server-side rendering.
- Application State Management - Maintains a consistent local representation of remote data to keep the user interface updated.
- GraphQL Result Caches - Stores fetched GraphQL query results locally to minimize network requests and improve data retrieval speed.
- Local State Stores - Provides mechanisms for managing application-local data via client-side schemas and resolvers for data not on a remote server.
- GraphQL Normalized Caches - Ships a normalized cache that identifies objects by ID to ensure referential equality and consistent data updates across queries.
- Remote Data Management - Automates the fetching, caching, and synchronization of remote GraphQL data to keep the application state consistent.
- Server State Managers - Maintains a consistent local representation of remote server data to ensure reactive UI updates.
- Component Data Bindings - Binds GraphQL queries and mutations to React components using hooks for automatic UI updates.
- Local Schema Resolvers - Provides a mechanism to define and resolve local schemas for data that does not exist on the remote server.
- Data Fetching & Caching - Synchronizes remote data with a local frontend application using an intelligent caching system.
- GraphQL Clients - Functions as a comprehensive library for requesting data from GraphQL servers and managing that state in frontends.
- Browser-Side State Management - Provides tools for defining client-side schemas and resolvers to manage application state within the browser.
- Observable State Tracking - Tracks data dependencies using observables to automatically trigger UI updates when cached fragments change.
- Automatic Query Execution Engines - Automatically triggers query refetching in response to system events like window focus or network reconnection.
- Query Batching - Combines multiple GraphQL operations into a single network request to reduce overhead and round trips.
- Hydration State Transfers - Serializes server-side cache into JSON for rehydration in the client store upon page load.
- Middleware-Based Request Pipelines - Implements a modular pipeline of pluggable links to intercept and modify network requests.
- Request Batching - Implements request batching to group multiple GraphQL operations into a single network call.
- Data Fragment Masking - Uses fragments to mask GraphQL data, ensuring components only access the specific fields they require.
- UI Data Observers - Uses observables to synchronize data streams between the GraphQL server and the application state.
- Composable Middleware Pipelines - Uses a chain of composable links to process network requests and transform data.
- API Mocking - Includes a mocking tool to simulate server responses and network delays for testing data fetching logic.
- Suspenseful Data Loading - Coordinates component rendering suspension until requested data is available in the cache or network.
- API Mocking Servers - Simulates server responses with realistic delays to test data fetching without a live backend.
- Fragment Data Masking - Ensures components only access the specific slices of cached data they requested via fragments.
- GraphQL Fragment Masking - Limits the data a component can access to only what is defined in its associated GraphQL fragment.
- Request Interception Middleware - Transforms requests and handles authentication through a chain of interception middleware.
- Server-Side Rendering - Supports hydrating the client cache on the server to provide static markup and prevent flickering during load.
- Database and Backend - GraphQL client for building data-driven applications.
- State Management - Production-ready caching client for GraphQL.
- GraphQL Clients - A fully-featured, production ready caching GraphQL client.
- State Management - Listed in the “State Management” section of the Awesome React awesome list.
