List subfields
Get a list of subfields (third-level topic categories). There are 254 subfields spread across 26 fields.
Query parameters
Filter subfields. Examples: field.id:17, domain.id:3, works_count:>100000 See all Subfield fields.
Sort by: works_count, cited_by_count. Prefix with - for descending. See all Subfield fields.
Group by: field.id, domain.id See all Subfield fields.
Full-text search across titles, abstracts, and other text fields. Example: search=machine learning
Number of results per page (1-100, default 25)
Page number for pagination. Use cursor for deep pagination beyond 10,000 results.
Cursor for deep pagination. Use cursor=* to start, then use the next_cursor from the response.
Return a random sample of N results (max 10,000). Cannot be used with sort or page.
Comma-separated list of fields to return. Reduces response size. Example: select=id,display_name,cited_by_count
Your OpenAlex API key (required). Get a free key at https://openalex.org/settings/api
Response
Successful response
Example response
{
"results": [
{
"id": "https://openalex.org/subfields/1702"
}
]
}