GraphQL / Basic: language and response contracts

GraphQL β€” Basic: language and response contracts

Read types, operations, inputs and response boundaries precisely.

6 lessons Β· No account required

What you will learn

  • Predict valid selections, variable behavior and null boundaries.
  • Separate transport rejection, execution errors and domain results.

  1. Graph contracts and the operation lifecycle

    Separate the schema, executable document, transport and application data before implementing a graph.

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  2. Objects, scalars, enums and nullability

    Choose precise output types and reason about null propagation instead of adding exclamation marks indiscriminately.

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  3. Queries, arguments and variables

    Build reusable named operations and distinguish omitted input from explicit null.

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  4. Fragments, directives and abstract types

    Compose reusable selections and handle interfaces or unions without confusing conditional presentation with authorization.

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  5. Inputs, mutations and domain results

    Design a bounded write contract with clear patch semantics and distinguish expected domain rejection from execution failure.

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  6. Responses, errors and HTTP envelopes

    Interpret data and errors together and keep language execution distinct from evolving HTTP transport conventions.

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