GET /books/
loc.gov:library-of-congress-api
Summary: Search books
Operation ID: searchBooks
Auth: none
Operation ID: searchBooks
Auth: none
Description
Search and browse books from the Library of Congress collections.
Parameters (4)
c
(integer, query, optional, default: 25)
Count/items per page
fo
(string, query, optional, default: json)
Output format
Constraints: {'enum': ['json', 'yaml']}
q
(string, query, optional)
Search term
sp
(integer, query, optional)
Start page number
Examples (3)
| Title | Type | URL | Action |
|---|---|---|---|
| Search books and printed materials | openapi-spec |
https://www.loc.gov/books/?q=twain&fo=json |
|
| Search books and printed material | openapi-spec |
https://www.loc.gov/books/?fo=json |
|
| Search books | probe-gate |
https://www.loc.gov/books/?fo=json&c=25 |
Probe History
Status Codes
| Time | Status | Latency | Size |
|---|---|---|---|
| 2026-03-23 10:48:32.222413 | 200 | 1247ms | |
| 2026-03-23 09:33:04.213152 | 200 | 1022ms | |
| 2026-03-23 09:26:46.672977 | 200 | 757ms |
Response Changes
| When | Old | New |
|---|---|---|
| 2026-03-23 09:33:04.213152 | eae32aff2c46 |
6779236f41c8 |
| 2026-03-23 10:48:32.222413 | 6779236f41c8 |
81445f9de287 |