JSON:API

1. Document structure

   Top-level members data, errors, meta, links and included.

2. Resource objects

   id, type, attributes, relationships and links.

3. Compound documents

   Full linkage and the included array.

4. Fetching resources

   GET semantics for resource collections and individual resources.

5. Inclusion of related resources

   The include query parameter.

6. Sparse fieldsets

   The fields[TYPE] query parameter.

7. Sorting and pagination

   sort parameter and pagination links.

8. Creating resources

   POST semantics, 201 Created and client-generated IDs.

9. Updating resources

   PATCH semantics for attributes and relationships.

10. Error objects

    status, code, title, detail and source members.

11. Content negotiation

    Media type parameters and 415/406 behavior.

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