List fields
Get a list of fields (second-level topic categories). There are 26 fields spread across 4 domains.
Query parameters
Filter fields. Examples: domain.id:1, works_count:>1000000 See all Field fields.
Sort by: works_count, cited_by_count. Prefix with - for descending. See all Field fields.
Group by: domain.id See all Field 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/fields/27"
}
]
}