GET /collections

loc.gov:library-of-congress-api

Summary: List all digital collections
Operation ID: listCollections
Auth: none
Description

Get a list of all Library of Congress digital collections

Parameters (1)

fo (string, query, required)

Output format - must be 'json' for JSON response

Constraints: {'enum': ['json']}

Examples (3)

TitleTypeURLAction
List all collections (JSON format) curl https://www.loc.gov/api/collections?fo=json
List collections with result limit curl https://www.loc.gov/api/collections?fo=json&c=10
List collections with offset for pagination curl https://www.loc.gov/api/collections?fo=json&c=20&sp=2

Probe History

Latency

Status Codes

TimeStatusLatencySize
2026-03-23 10:51:20.969317 404 526ms
2026-03-23 10:08:41.174464 404 612ms
2026-03-23 09:43:14.153127 404 240ms

Response Changes

WhenOldNew
2026-03-23 10:08:41.174464 b66a0ad84841 e41d8d0d8924
2026-03-23 10:51:20.969317 e41d8d0d8924 1a76586d59be