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🌐 GraphQL API Queries

GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. It provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more.

📖 Key Topics

  1. Schema Definition Language (SDL): Types, fields, inputs, and scalars.
  2. Operations:
    • Query: Reading data (exact field selection).
    • Mutation: Writing/modifying data.
    • Subscription: Real-time updates via WebSockets.
  3. Resolvers: Functions on the server that fetch the data for a particular field.
  4. Performance: Over-fetching vs under-fetching, N+1 query problem, dataloader patterns.