filter parameter, formatted like this: filter=attribute:value,attribute2:value2. Examples:https://api.openalex.org/authors?filter=display_name.search:einstein<) and greater-than (>) symbols to filter by inequalities. Example:https://api.openalex.org/venues?filter=works_count:>1000from_publication_date filter on works. See the endpoint-specific documentation below for more information. Example: https://api.openalex.org/works?filter=from_publication_date:2022-01-01,to_publication_date:2022-01-26!) to the filter value. Example:https://api.openalex.org/institutions?filter=country_code:!ushttps://api.openalex.org/works?filter=cited_by_count:>1,is_oa:truehttps://api.openalex.org/works?filter=institutions.country_code:fr,institutions.country_code:gbhttps://api.openalex.org/works?filter=concepts.id:C71924100,concepts.id:C154945302|) to input lists of values such that any of the values can be satisfied--in other words, when you separate filter values with a pipe, they'll be combined as an OR query. Example:https://api.openalex.org/works?filter=institutions.country_code:fr|gb10.1371/journal.pone.0266781 or with DOI 10.1371/journal.pone.0267149 (note the pipe separator between the two DOIs):
https://api.openalex.org/works?filter=doi:https://doi.org/10.1371/journal.pone.0266781|https://doi.org/10.1371/journal.pone.0267149https://api.openalex.org/works?filter=institutions.country_code:fr|host_venue.issn:0957-1558/works filters/works attribute filters Work entity object (click each one to view their documentation on the Work entity page):/works convenience filtersWork entity object, but they're handy for solving some common use cases:display_name.search (alias: title.search)display_name (title) includes the given string; see the search filter for details. https://api.openalex.org/works?filter=title.search:wombat search parameter instead of this filter, because it uses a better search algorithm and searches over abstracts as well as titles.abstract.searchhttps://api.openalex.org/works?filter=abstract.search:artificial%20intelligenceraw_affiliation_string.searchraw_affiliation_string which includes the given string. See the search filter for details on the search algorithm used. raw_affiliation_string: https://api.openalex.org/works?filter=raw_affiliation_string.search:department%20of%20political%20science%20university%20of%amsterdamhas_doi true or false)citeshttps://api.openalex.org/works?filter=cites:W2741809807cited_byreferenced_works section. You can think of this as outgoing citations. related_tohttps://api.openalex.org/works?filter=related_to:W2486144666
from_publication_dateyyyy-mm-ddhttps://api.openalex.org/works?filter=from_publication_date:2001-03-14to_publication_dateyyyy-mm-ddhttps://api.openalex.org/works?filter=to_publication_date:2001-03-14has_oa_accepted_or_published_versiontrue or false)host_venue or alternate_host_venue where is_oa= true and version is acceptedVersion or publishedVersion. For Works that undergo peer review, like journal articles, this means there is a peer-reviewed OA copy somewhere. For some items, like books, a published version doesn't imply peer review, so they aren't quite synonymous.https://api.openalex.org/works?filter=has_oa_accepted_or_published_version:truetrue or false)host_venue or alternate_host_venue where is_oa= true and version is submittedVersion. This is useful for finding works with preprints deposited somewhere.https://api.openalex.org/works?filter=has_oa_submitted_version:true/authors filters/authors attribute filtersAuthor entity object (click each one to view their documentation on the Author entity page):/authors convenience filtersAuthor entity object, but they're included to address some common use cases:display_name.searchsearch parameter instead of this filter because it uses a better search algorithm.has_orcidtrue or false)/venues filters/venues attribute filtersVenue entity object (click each one to view their documentation on the Venue entity page):/venues convenience filtersVenue entity object, but they're included to address some common use cases:display_name.searchhttps://api.openalex.org/venues?filter=display_name.search:Neurologysearch parameter instead of this filter because it uses a better search algorithm.has_issntrue or false)/institutions filters/institutions attribute filtersInstitution entity object (click each one to view their documentation on the Institution entity page):/institutions convenience filtersInstitution entity object, but they're included to address some common use cases:display_name.searchhttps://api.openalex.org/institutions?filter=display_name.search:technologyhas_rortrue or false)/concepts filters/concepts attribute filtersConcept entity object ((click each one to view their documentation on the Concept entity page):/concepts convenience filtersConcept entity object, but they're included to address some common use cases:display_name.searchhttps://api.openalex.org/concepts?filter=display_name.search:electrodynamicshas_wikidatatrue or false)