On this page:

The LibraryCloud Item API provides access to metadata about items in the Harvard Library collections. For the purposes of this API, an “item” is the metadata describing a catalog record within the Harvard Library. LibraryCloud Item API searches over 20,000,000 aggregated metadata records. Records are sourced from Harvard Library's main catalog (Alma), JSTOR Forum (for visual information components), and ArchivesSpace (for archival finding aid components).

Base URI

http://api.lib.harvard.edu/v2/items

Simple Query

The simplest query to the API includes only a search term:
http://api.lib.harvard.edu/v2/items?q=peanuts
The response will include all items where any field contains the text “peanuts”, as XML

Multiple terms may be used in a simple query:
https://api.lib.harvard.edu/v2/items?q=Schulz peanuts
https://api.lib.harvard.edu/v2/items?q=Schulz+peanuts
https://api.lib.harvard.edu/v2/items?q=Schulz AND peanuts
All the above queries will return items where any field contains the text “Schulz” AND “peanuts”.

https://api.lib.harvard.edu/v2/items.json?q=Schulz OR peanuts
The response will include all items where any field contains the text “Schulz” OR “peanuts”, as JSON.

https://api.lib.harvard.edu/v2/items?q=Schulz NOT peanuts
The response will include all item where any field contains the text "Schulz" but NOT "peanuts".

Simple Response

The response to any query contains the total number of matching records, the number of records included within this response, the page number of this response, and the matching records.

Sample XML Response:
https://api.lib.harvard.edu/v2/items?q=peanuts

Searching by Field

See the Field Reference for a list of field-based queries.

A query can be limited to a particular field:
https://api.lib.harvard.edu/v2/items?title=peanuts
This query returns all items with the text “peanuts” in the title field.

Query terms can be combined:
https://api.lib.harvard.edu/v2/items?title=peanuts&q=snack
This query returns all items with the text “peanuts” in the title field and “snack” anywhere in the record. There is currently no equivalent syntax to express "OR" or "NOT" with fielded query terms.

https://api.lib.harvard.edu/v2/items?title=peanuts&name=Schulz
This query returns all items with the text “peanuts” in the title field and “Shulz” in the name field.

Case-sensitive exact-match queries can be done on specific fields by appending _exact to the field name:
https://api.lib.harvard.edu/v2/items?title_exact=Peanuts
This query returns all items with a title of exactly “Peanuts”. In the Field Reference list, the Exact Match Search column indicates if a field supports an exact match query.

Accented Characters and Punctuation

If your query terms contain accented characters, include these in the search:
https://api.lib.harvard.edu/v2/items?name=Saint-Exupéry, Antoine de
https://api.lib.harvard.edu/v2/items?name=Molière

If your query includes an ampersand, the ampersand must be replaced by the URL-encoded equivalent (%26). For example, to search the title Saxo Grammaticus & the life of Hamlet:
https://api.lib.harvard.edu/v2/items?title_exact=Saxo+Grammaticus+%26+the+life+of+Hamlet

At this time, LibraryCloud queries can be sensitive to the presence of punctuation. Some MODS fields (e.g. Genre) include supplied punctuation (e.g., a terminal period or comma) that must be included in the query or it will fail.

Stemming, Stopwords and Wildcards

LibraryCloud uses standard Solr index stemming and stopword lists. The stemming algorithm is based on the Porter stemming algorithm.

Keywords may be wild-carded with an asterisk:
https://api.lib.harvard.edu/v2/items?title=peanut*
https://api.lib.harvard.edu/v2/items?title=p*nut

Paging

By default, each response will include the first 10 records available. A query can request more records in a response (up to 250), and page through the results.
https://api.lib.harvard.edu/v2/items?title=peanuts?start=100&limit=50
Return the results for the query starting at item 100, with a page size of 50 (e.g. records 100 through 149).

Parameter	Description
start	The row number to start returning results from. If omitted, will default to 1.
limit	The number of results to return. Default is 10. May be between 0 and 250.

Sorting

Responses can sorted in ascending or descending order. See the Field Reference for a list of sortable fields.
https://api.lib.harvard.edu/v2/items?title=peanuts&sort.asc=resourceType
Sort results by the “resourceType” field, in ascending order.

Parameter	Description
sort.asc OR sort	The field to use for sorting, in ascending order
sort.desc	The field to use for sorting, in descending order

Many fields are available for faceting (see the Field Reference "Can Facet" column for details).
https://api.lib.harvard.edu/v2/items.json?title=peanuts&facets=name,resourceType
Facet search results by the “name” and “resourceType” fields

Parameter	Description
facets	A comma-separated list of facets to return
facet_size	The maximum number of facets to be returned for each faceted field. Default is 10. May be between 1 and 100.

Response Format

By default, all responses are in MODS format. Dublin Core (DC) can be requested by adding .dc to the base URI
https://api.lib.harvard.edu/v2/items.dc?title=peanuts

Response Serialization

By default, all responses are returned as XML. Responses can be returned as JSON either by adding “.json” to the base URI, or by setting the “Accept” HTTP header in the request to “application/json”. When specifying both the response format and serialization, the format should be added first.
https://api.lib.harvard.edu/v2/items.json?title=peanuts
https://api.lib.harvard.edu/v2/items.dc.json?title=peanuts

Cross-domain queries

The API sets the necessary CORS header to allow cross-domain requests in supported browsers. Cross-domain queries can also use JSONP by specifying a callback function name in a “callback” parameter.
https://api.lib.harvard.edu/v2/items.json?title=peanuts&callback=myfunction

Parameter	Description
calback	Javascript function name. The response data will enclosed in a javascript function call with this name.

API Versioning

The version number of the API is specified in the base URL (e.g. “v2”). A version number is always required when accessing the API. The version number will be incremented whenever breaking (non backwards-compatible) changes are made to the API.

Field Reference

This section describes the fields available for searching through the API. In some cases, fields available through the API aggregate multiple fields with the MODS records. When applicable, this is identified in the MODS field mapping column.

Yes

Name	On LC Solr field list?	Keyword Search	Exact Match Search	Can Sort	Can Facet	MODS Field Mapping	Notes
title	Y	Yes	Yes	No	No	titleInfo.title titleInfo.subTitle titleInfo.partNumber titleInfo.partName	https://api.lib.harvard.edu/v2/items?title=complete motown singles Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?title_exact=Labour Party
name	Y	Yes	Not available	No	Yes	name.namePart e.g. "Greenblatt, Stephen"	Will find term in any name field: https://api.lib.harvard.edu/v2/items?name=shakespeare ?Search by name_exact returns 0 for known items: https://api.lib.harvard.edu/v2/items?name_exact=keller, helen
role	Y	Yes	Yes?	No	Yes	name.namePart.role.roleTerm	https://api.lib.harvard.edu/v2/items?name=shakespeare&role=publisher
resourceType GETTING FALSE POSITIVES	Y	Yes	Yes?	No	Yes	typeOfResource	https://api.lib.harvard.edu/v2/items?name=shakespeare&resourceType=three dimensional object
isCollection (Values are “true” or “false”) GETTING FALSE POSITIVES	Y	No	Yes?	No	Yes	typeOfResource (where collection="yes") Indicates whether or not a record describes a collection of items.	https://api.lib.harvard.edu/v2/items?q=colonial+north+america&isCollection=true
isManuscript (Values are “true” or “false”) GETTING FALSE POSITIVES	Y	No	Yes?	No	Yes	typeOfResource (where manuscript="yes") Indicates whether or not a record describes manuscript or archival material.	https://api.lib.harvard.edu/v2/items?q=colonial+north+america&isManuscript=true
genre	Y	Yes	Yes	No	Yes	genre	https://api.lib.harvard.edu/v2/items?q=fish+watercolor&genre=Drawings Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?genre_exact=pendants (jewelry)
originPlace	Y	Yes	Yes	No	Yes	originInfo.place.placeTerm	https://api.lib.harvard.edu/v2/items?q=colonial+north+america&originPlace=Boston Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?originPlace_exact=New-England
publisher	Y	Yes	Yes	No	Yes	originInfo.publisher	https://api.lib.harvard.edu/v2/items?q=shakespeare&publisher=Arden Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?q=shakespeare&publisher_exact=Arden Shakespeare
originDate	Y	Yes	Yes	No	Yes	originInfo.dateIssued originInfo.dateCreated originInfo.dateCaptured originInfo.copyrightDate originInfo.dateOther	https://api.lib.harvard.edu/v2/items?name=asimov+isaac&originDate=1961 Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?name=asimov+isaac&originDate_exact=[1961]
dateIssued	Y	Yes	Yes	Yes	Yes	originInfo.dateIssued	https://api.lib.harvard.edu/v2/items?name=asimov%20isaac&dateIssued=1961 Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?name=asimov%20isaac&dateIssued_exact=[1961]
dateCreated	Y	Yes	Yes	Yes	Yes	originInfo.dateCreated	https://api.lib.harvard.edu/v2/items?q=daguerreotypes&dateCreated=1806 Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?dateCreated_exact=late 18th-early 19th century
dateCaptured	Y	Yes	Yes	Yes	Yes	originInfo.dateCaptured	https://api.lib.harvard.edu/v2/items?dateCaptured=2016&genre=performed+music Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?dateCaptured_exact=201502--
copyrightDate	Y	Yes	Yes	Yes	Yes	originInfo.copyrightDate Use YYYY format to search.	https://api.lib.harvard.edu/v2/items?copyrightDate=2010
dates.start	Y item api code does start/end processing	Yes	No	No	No	originInfo.dateIssued originInfo.dateCreated	This query returns all works by Molière published from 1990 forward: https://api.lib.harvard.edu/v2/items?name=Molière&dates.start=1990 This query returns all works by Molière published from 1990 backward: https://api.lib.harvard.edu/v2/items?name=Molière&dates.end=1990 This query returns all works by Molière published from 1990 to 2000: https://api.lib.harvard.edu/v2/items?name=Molière&dates.start=1990&dates.end=2000
dates.end	Y item api code does start/end processing	Yes	No	No	No	originInfo.dateIssued originInfo.dateCreated
dateRange (future)
edition	Y	Yes	Yes	Yes	Yes	originInfo.edition	https://api.lib.harvard.edu/v2/items?name=Molière&edition=7th. ed. Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?name=wordsworth&edition_exact=[1st ed.]
issuance	Y	Yes	Yes	Yes	Yes	originInfo.issuance	This query returns items with subject "astronomy" issued as a serial: https://api.lib.harvard.edu/v2/items?subject=astronomy&issuance=serial
languageCode (Searches based on language ISO code)	Y	No	Yes	No	Yes	language.languageTerm (where languageTerm type="code")	This query returns items of Shakespeare in Chinese: https://api.lib.harvard.edu/v2/items?name=shakespeare&languageCode=chi
languageText (Searches based on language name text)	Y	Yes	Yes	No	Yes	language.languageTerm (where languageTerm type="text") facet as "language" rather than "languageText"	This query returns itemsby or about Laozi in Chinese: https://api.lib.harvard.edu/v2/items?title=laozi&language=Chinese
physicalDescription	Y			No	No	physicalDescription.form physicalDescription.note	NOT WORKING (In mods2solr.xsl, in the mods:mods template, entry for physicalDescription field is commented out) https://api.lib.harvard.edu/v2/items?title=peanut&physicalDescription=print
abstractTOC	Y	Yes	No	No	No	abstract tableOfContents	This query returns items with the keyword "justinian" in an abstract or table of contents field: https://api.lib.harvard.edu/v2/items?abstractTOC=Justinian
classification (Physical organization code. Includes bibliographic-level classification but not holdings. See LibraryCloud Item API for holdings-level classification.)	Y	No	Yes	Yes	Yes	classification	https://api.lib.harvard.edu/v2/items?classification=F1435.3 Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?classification_exact=PR2825.A2 I8
identifier (Identifier of an item in another system)	Y	No	Yes	Yes	No	identifier	This query returns an item by it's ISBN: https://api.lib.harvard.edu/v2/items?identifier=9789601426440
seriesTitle	Y item api code does the translation from seriesTitle	Yes	Yes?	No	Yes	In relatedItem[@type='series']: titleInfo.title titleInfo.subtitle titleInfo.partName titleInfo.partNumber facet as "relatedItem" rather than "seriesTitle"	https://api.lib.harvard.edu/v2/items?seriesTitle=Harvard-Yenching Institute Monograph Series
subject	Y	Yes	Yes?	No	Yes?	subject.topic subject.geographic subject.temporal subject.titleInfo subject.name subject.genre subject.hierarchicalGeographic.continent subject.hierarchicalGeographic.country subject.hierarchicalGeographic.province subject.hierarchicalGeographic.region subject.hierarchicalGeographic.state subject.hierarchicalGeographic.territory subject.hierarchicalGeographic.county subject.hierarchicalGeographic.city subject.hierarchicalGeographic.island subject.hierarchicalGeographic.area subject.hierarchicalGeographic.extraterrestrialArea subject.hierarchicalGeographic.citySection	https://api.lib.harvard.edu/v2/items?subject=perseus Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?subject_exact=cylinder seals Notes: An exact query will not match on a subject plus its subdivision because this metadata is fielded separately in LibCloud. E.g.: the subject heading "Older people -- Services for" appears in the LibCloud MODS record as: <mods:topic>Older people</mods:topic> <mods:topic>Services for</mods:topic> Faceting or an _exact query on MODS subject.name and subject.titleinfo does not currently work.
subject.topic	Y	Yes	Yes	No	Yes	subject.topic	https://api.lib.harvard.edu/v2/items?subject.topic=Mochica pottery Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?subject.topic_exact=Mochica pottery
subject.temporal	Y	Yes	Yes	No	Yes	subject.temporal	https://api.lib.harvard.edu/v2/items?q=samurai&subject.temporal=edo Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?q=samurai&subject.temporal_exact=Edo period, 1600-1868
subject.titleInfo	Y	Yes	Yes	No	Yes	subject.titleInfo.title subject.titleInfo.subTitle subject.titleInfo.partNumber subject.titleInfo.partName	https://api.lib.harvard.edu/v2/items?subject.titleInfo=Middlemarch Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?subject.titleInfo_exact=Gospel%20of%20Mary
subject.name	Y	Yes	Yes	No	Yes	subject.name subject.name.namePart	https://api.lib.harvard.edu/v2/items?subject.name=kubrick stanley Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?subject.name=Kubrick,%20Stanley
subject.name.role	Y	Yes?	Yes	No	Yes	subject.name.role.roleTerm	https://api.lib.harvard.edu/v2/items?subject.name.role=cmp ?Most role terms in this MODS path are terminated with a period (e.g. photographer.). Need to include punctuation or query will fail: https://api.lib.harvard.edu/v2/items?subject.name.role=photographer. OTOH, subject.genre also has terminal periods on terms but the solr query works with or without: https://api.lib.harvard.edu/v2/items?subject.genre=Folklore.
subject.genre	Y	Yes	Yes?	No	Yes	subject.genre	https://api.lib.harvard.edu/v2/items?subject.genre=folklore ?Case-sensitive exact match DOESN"T WORK: https://api.lib.harvard.edu/v2/items?subject.genre_exact=Folklore.
subject.geographic	Y	Yes	Yes	No	Yes	subject.geographic	https://api.lib.harvard.edu/v2/items?subject.geographic=giza Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?subject.geographic_exact=Giza, Egypt
subject.hierarchicalGeographic The umbrella "subject" field is not populated, but most individual components are. Remove and JIRA this.	Y	Yes?	Yes	No	No	subject.hierarchicalGeographic.continent subject.hierarchicalGeographic.country subject.hierarchicalGeographic.province subject.hierarchicalGeographic.region subject.hierarchicalGeographic.state subject.hierarchicalGeographic.territory subject.hierarchicalGeographic.county subject.hierarchicalGeographic.city subject.hierarchicalGeographic.island subject.hierarchicalGeographic.area subject.hierarchicalGeographic.extraterrestrialArea subject.hierarchicalGeographic.citySection	Solr query returns no results: https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic=Boston ?But some of the individual MODS paths work in a query or as a facet, e.g.: https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.city=Boston https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.country=Morocco https://api.lib.harvard.edu/v2/items?q=volcano*&facets=subject.hierarchicalGeographic.country
subject.hierarchicalGeographic.continent	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.continent	NOT WORKING / Seems a valid SOLR field, but no values returned https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.continent=africa
subject.hierarchicalGeographic.country	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.country	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.country=canada
subject.hierarchicalGeographic.province	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.province	NOT WORKING / Seems a valid SOLR field, but no values returned https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.province=quebec
subject.hierarchicalGeographic.region	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.region	NOT WORKING / Seems a valid SOLR field, but no values returned https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.region=nile
subject.hierarchicalGeographic.state	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.state	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.state=massachusetts&q=maps
subject.hierarchicalGeographic.territory	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.territory	NOT WORKING / Seems a valid SOLR field, but no values returned https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.territory=*
subject.hierarchicalGeographic.county	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.county	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.county=middlesex
subject.hierarchicalGeographic.city	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.city	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.city=Cochituate&q=maps
subject.hierarchicalGeographic.island	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.island	NOT WORKING / Seems a valid SOLR field, but no values returned https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.island=*
subject.hierarchicalGeographic.area	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.area	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.area=galicia
subject.hierarchicalGeographic.extraterrestrialArea	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.extraterrestrialArea	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.extraterrestrialArea=*
subject.hierarchicalGeographic.citySection	Y	Yes	Yes	No	Yes	subject.hierarchicalGeographic.citySection	https://api.lib.harvard.edu/v2/items?subject.hierarchicalGeographic.citySection=charlestown
physicalLocation (Includes Harvard repository names but also non-Harvard locations, especially for artworks.)	Y	Yes	No	Yes	Yes	location.physicalLocation	https://api.lib.harvard.edu/v2/items?physicalLocation=tozzer&subject=cylinder seals
repository (Includes Harvard repositories only)	N (item api code does the processing)	Yes	Yes	No	Yes	Search: location.physicalLocation (where @type="repository") Facet: extension.librarycloud.HarvardRepositories.HarvardRepository A search will query the long form repository name (e.g.Eda Kuhn Loeb Music Library); faceting will return the short form repository name (e.g. Loeb Music).	https://api.lib.harvard.edu/v2/items?q=peanuts&repository=Oakes Ames
shelfLocator	Y	Yes	Yes	Yes	No	location.shelfLocator	https://api.lib.harvard.edu/v2/items?q=peanuts&shelfLocator=Film Mas Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?q=peanuts&shelfLocator_exact=Film%20Mas%2025860
url	Y	No	Yes	No	No	location.url	https://api.lib.harvard.edu/v2/items?q=earhart amelia&url=RAD.SCHL Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?q=earhart amelia&url_exact=https://nrs.harvard.edu/urn-3:RAD.SCHL:29639951
url.access (At this time, only url.access=preview works.)	N (url.access.preview, url.access.raw_object are listed, but item api code uses url.access)	No	Yes	No	Yes	location.url.access (range = <preview, raw object, object in context>) facet as url.access.preview or url.access.raw_object	There's a typo in item api code: defined range values are "preview" and "raw object in context" but should be "preview", "raw object", and "object in context". "preview" value works, e.g.: https://api.lib.harvard.edu/v2/items?q=earhart amelia&url.access=preview "raw object in context" works as a query but it returns items without url@access="raw object", e.g.: https://api.lib.harvard.edu/v2/items?q=earhart%20amelia&url.access=raw object in context
isOnline (Indicates whether or not an item is available in digital form; values are "true" or "false. See also LibraryCloud Item API.)	Y	No	No	Yes	Yes	"true" if location.url[@access = 'raw object'] exists, "false" otherwise	https://api.lib.harvard.edu/v2/items?q=earhart amelia&isOnline=true
source	Y	No	No	Yes	Yes	recordInfo.recordIdentifier source attribute Sources are currently MH:ALMA (from Alma), MH:VIA (image items from JSTOR forum), or MH:OASIS (finding aid components from ArchivesSpace). Attribute occurs only on top-level recordInfo.recordIdentifier elements	https://api.lib.harvard.edu/v2/items?q=earhart amelia&source=MH:ALMA
recordIdentifier	Y	No	Yes	No	No	recordInfo.recordIdentifier at the top level only priorrecordids.recordIdentifier e.g. recordIdentifier=sch00443c00007 (for finding aids), recordIdentifier=S26791_olvsurrogate827653 (for images), recordIdentifier=012956251 (for Aleph) (Internal recordInfo.recordIdentifier elements in finding aid components and image records can be searched as keywords.)	https://api.lib.harvard.edu/v2/items?recordIdentifier=990148733450203941 (for Alma) https://api.lib.harvard.edu/v2/items?recordIdentifier=014873345 (for Aleph) https://api.lib.harvard.edu/v2/items?recordIdentifier=sch00227c00197 (for finding aids) https://api.lib.harvard.edu/v2/items?recordIdentifier=W42143_urn-3:FHCL:1176307 (for images) Use a keyword query to retrieve items based on record ID in finding aid components and image records: https://api.lib.harvard.edu/v2/items?q=olvsurrogate717044
urn (?Queries an item by its NRS URN (the URN only e.g., " urn-3:FHCL:1155043" minus the actionable URL components)	Y	Yes	No	No	No	location.url	https://api.lib.harvard.edu/v2/items?urn=urn-3:FHCL:1155043
collectionTitle (see /wiki/spaces/LibraryStaffDoc/pages/43288674) (Query by the set/collection title assigned to items that have been grouped together for delivery via Harvard Digital Collections)	Y	Yes	Yes	Yes	Yes	extension.sets.setName extension.sets.setSpec	https://api.lib.harvard.edu/v2/items?collectionTitle=Chinese Rare Books Case-sensitive exact match:https://api.lib.harvard.edu/v2/items?collectionTitle_exact=Chinese Rare Books
collectionId (see /wiki/spaces/LibraryStaffDoc/pages/43288674) (Query by the set/collection ID assigned to items that have been grouped together fo rdelivery via Harvard Digital Collections)	Y	No	Yes	No	Yes	extension.sets.systemId	https://api.lib.harvard.edu/v2/items?collectionId=84560 Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?collectionId_exact=84560
DRS Extensions
inDRS (Query for items in Harvard Library's digital repository service. See also LibraryCloud Item API.)	Y	No	Yes		Yes	extension.HarvardDRS.inDRS (range = <"true", "false">)	https://api.lib.harvard.edu/v2/items?genre=daguerreotype&inDRS=true
accessFlag (valid if inDRS=true) See also: LibraryCloud Item API to query human-readable version of DRS accessFlags.	Y	No	Yes		Yes	extension.HarvardDRS.accessFlag (range = <P, R, N, B>) P (publicly accessible), R (restricted to Harvard), N (not available for delivery), B (bypass, access handled differently)	https://api.lib.harvard.edu/v2/items?genre=daguerreotype&accessFlag=P
contentModel (valid if inDRS=true) See also: LibraryCloud Item API to query by human-readable value derived from the contentModel for an object in Harvard's Digital Repository Service (DRS).	Y	Yes	Yes		Yes	extension.HarvardDRS.contentModel (range = <AUDIO, DOCUMENT, PDS DOCUMENT, PDS DOCUMENT LIST, STILL IMAGE, TEXT, VIDEO>) Use _exact query to find "DOCUMENT"	https://api.lib.harvard.edu/v2/items?title=biodiversity&limit=100&contentModel=PDS DOCUMENT Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?contentModel_exact=DOCUMENT
uriType (valid if inDRS=true) (Query for items by type of delivery urn, which is a proxy for type of delivery service)	Y	No	Yes		Yes	extension.HarvardDRS.uriType (range = <FDS, IDS, PDS, PDS_LIST, SDS, SDS_VIDEO>) Delivery service types: FDS (text documents), IDS (images), PDS (page-turned objects), PDS_LIST (list of page-turned objects), SDS (streaming audio), (SDS_VIDEO (streaming video)	https://api.lib.harvard.edu/v2/items?subject=jazz&uriType=SDS
fileDeliveryURL (valid if inDRS=true) (Query an item by its full delivery URL)	Y	No	Yes		No	extension.HarvardDRS.fileDeliveryURL, eg. "http://nrs.harvard.edu/urn-3:FHCL.HOUGH:1090399"	https://api.lib.harvard.edu/v2/items?title=annual+report&fileDeliveryURL=https://nrs.harvard.edu/urn-3:HMS.COUNT:22923642
ownerCode (valid if inDRS=true)	Y	No	Yes		Yes	extension.HarvardDRS.ownerCode, eg. "FHCL.HOUGH"	https://api.lib.harvard.edu/v2/items?q=cookbook*&ownerCode=RAD.SCHL
ownerCodeDisplayName (valid if inDRS=true)	Y	No	Yes		Yes	extension.HarvardDRS.ownerCodeDisplayName, eg. "Houghton Library"	https://api.lib.harvard.edu/v2/items?q=daguerreotype&ownerCodeDisplayName=Schlesinger
metsLabel (valid if inDRS=true) (Query for items by keywords in the descriptive METS label - if defined in DRS metadata)	Y	Yes	Yes		No	extension.HarvardDRS.metsLabel eg. Any text string	https://api.lib.harvard.edu/v2/items?metsLabel=seward Case-sensitive exact match: https://api.lib.harvard.edu/v2/items?metsLabel_exact=The Italians in Chicago. Washington: G.P.O., 1897.
lastModifiedDate (valid if inDRS=true) NOT WORKING	Y	No	Yes		No	extension.HarvardDRS.lastModifiedDate - eg. "2016-05-03T19:24:18.334Z". NOTE: This value needs to be converted into a searchable form, and the example value will change.	4/9/19 JW: item api reports "lastModifiedDate" as invalid field; note that field list, mods2solr.xsl and api code all refer to the field "_lastModifiedDate" but api reports this as undefined field also. https://api.lib.harvard.edu/v2/items?title_exact=Peanuts&lastModifiedDate=2015-08-21T21:16:36.389Z
maxImageDeliveryDimension		No	Future	No	Future	extension.HarvardDRS.maxImageDeliveryDimension - e.g., "600". Value is in pixels.
LibraryCloud Extensions
availableTo See also: availableTo to query by DRS accessFlag.	Y	No	Yes	No	Yes	extension.librarycloud.availableTo Human-readable values for access to digital content in Harvard's Digital Repository Service (DRS). Values are "Everyone" (corresponds to accessFlag=P) and "Harvard only" (corresponds to accessFlag=R).	https://api.lib.harvard.edu/v2/items?q=colonialism&availableTo=Everyone
digitalFormat See also: LibraryCloud Item API to query by the DRS content model of an object in Harvard's Digital Repository Service (DRS).	Y	Yes			Yes	extension.librarycloud.digitalFormats.digitalFormat Human readable values derived from the contentModel for an object in Harvard's Digital Repository Service (DRS). Values are audio, books and documents, images, and video.	https://api.lib.harvard.edu/v2/items?subject=poetry&digitalFormat=audio
processed.after	N	No	Yes			extension.librarycloud.processingDate Use YYYY-MM-DD format to search.	These date queries work, but # of matching hits is very high. What is meaning/context of processed.after and processed.before? This query returns items processed after the date specified: https://api.lib.harvard.edu/v2/items?processed.after=2019-01-01 This query returns items processed before the date specified: https://api.lib.harvard.edu/v2/items?processed.before=2019-01-02 This query returns items processed between the specified dates: https://api.lib.harvard.edu/v2/items?processed.after=2018-07-01&processed.before=2019-01-01
processed.before	N	No	Yes
Sets Extensions
setName	Y	Yes		No	Yes	extension.sets.set.setName Human-readable names that identify a set of materials selected by, for example, a curator for administrative or discovery purposes or for harvesting via OAI-PMH.	https://api.lib.harvard.edu/v2/items?setName=chinese rare books
setSpec	Y	Yes		No	Yes	extension.sets.set.setSpec Codes used to identify a set of materials selected by, for example, a curator for administrative or discovery purposes or for harvesting via OAI-PMH.	https://api.lib.harvard.edu/v2/items?setSpec=crb

Examples

#search all of LibraryCloud for “peanuts” in the title
http://api.lib.harvard.edu/v2/items?title=peanuts

#search oasis components for “peanuts” in the title
http://api.lib.harvard.edu/v2/items?title=peanuts&source=MH:OASIS (can use MH:OASIS, MH:VIA, or MH:ALEPH)

#search for a specific component identifier in OASIS
http://api.lib.harvard.edu/v2/items?recordIdentifier=sch00443c00007&source=MH:OASIS

#search for a specific component identifier in VIA (the identifier actually has the form "<viaRecordId>_<URN>", but the wildcard matches the URN portion if not known.
http://api.lib.harvard.edu/v2/items?recordIdentifier=W188002*

#search for all components in an OASIS record
http://api.lib.harvard.edu/v2/items?recordIdentifier=sch00443*

#look up the MODS for a PDS object given its URN

http://api.lib.harvard.edu/v2/items?urn=urn-3:FHCL.HOUGH:25620083

#search all of library cloud for VIA records that are public and have “peanuts” in the title (NOTE: "restricted" DRS Access Flag field not yet released to production API)
http://api.lib.harvard.edu/v2/items?title=peanuts&source=MH:VIA&accessFlag=P

#Get the facet counts for collections with various collection titles

https://api.lib.harvard.edu/v2/items?facets=collectionTitle

#Get all manuscripts from Schlesinger Library that contain either the string "electronic finding aid available" OR "electronic container list available"

https://api.lib.harvard.edu/v2/items?physicalLocation=sch&isManuscript=true&q=(https://api.lib.harvard.edu/v2/items?physicalLocation=sch&isManuscript=true&q=(electronic%20finding%20aid%20available)%20OR%20(electronic%20container%20list%20available))

Support

LibraryCloud Support

LibraryCloud Item API