GraphQL Specification

1. Overview

   Purpose and design principles of GraphQL.

2. Language

   Documents, operations, selection sets, fields, arguments, fragments, variables, directives.

3. Type system

   Schemas, scalars, objects, interfaces, unions, enums, input objects, lists and non-null.

4. Objects

   Object type definitions and field arguments.

5. Interfaces and unions

   Abstract types and type conditions.

6. Input objects

   Structured input arguments.

7. Introspection

   __schema, __type and introspection types.

8. Validation

   Rules a document must satisfy before execution.

9. Execution

   Query, mutation and subscription execution algorithms.

10. Normal and serial execution

    Parallel field execution vs serial mutations.

11. Handling field errors

    Null propagation for errors in non-null fields.

12. Response

    Response format with data, errors and extensions.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.