Topics Overview

Schema reference for Topics entities

Topics are research areas automatically assigned to works. Topics exist in a four-level hierarchy: domain > field > subfield > topic.

Filter, sort, and group_by fields

The API supports filtering, sorting, and grouping on topics fields. See Filtering, Sorting, and Grouping for syntax.

Fields marked (deprecated) are .search filters — use the search parameter instead.

Field	Sort	Group_by	Filter
cited_by_count	✓	✓	✓
default.search (deprecated)			✓
description.search (deprecated)			✓
display_name	✓		✓
display_name.search (deprecated)			✓
domain.id	✓	✓	✓
field.id	✓	✓	✓
from_created_date	✓		✓
id	✓	✓	✓
ids.openalex	✓	✓	✓
keywords.search (deprecated)			✓
openalex	✓	✓	✓
subfield.id	✓	✓	✓
works_count	✓	✓	✓