Filter topics

You can filter topics with the filter parameter:

• Get topics that are in the subfield "Epidemiology" (id: 2713) https://api.openalex.org/topics?filter=subfield.id:2713

It's best to read about filters before trying these out. It will show you how to combine filters and build an AND, OR, or negation query

/topics attribute filters

You can filter using these attributes of the Topic object (click each one to view their documentation on the Topic object page):

• cited_by_count

• domain.id

• field.id

• ids.openalex (alias: openalex)

• subfield.id

• works_count

/topics convenience filters

These filters aren't attributes of the Topic object, but they're included to address some common use cases:

default.search

Value: a search string

This works the same as using the search parameter for Topics.

display_name.search

Value: a search string

Returns: topics with a display_name containing the given string; see the search page for details.

• Get topics with display_name containing "artificial" and "intelligence": https://api.openalex.org/topics?filter=display_name.search:artificial+intelligence

In most cases, you should use the search parameter instead of this filter because it uses a better search algorithm.