Filters that apply to the matched article. Additional parameters that can be used to refine the data that is returned, based on the matched content properties. If no field is defined but a search string is present, the API will search for the value in headline, summary, and authors. See the Notes section at the bottom of this page. The Lucene query strings section shares important considerations, including the limits to the number of filters that are allowed.

Filters that apply to the source article. See below for available fields. See the Notes section at the bottom of this page. The Lucene query strings section shares important considerations, including the limits to the number of filters that are allowed.