discuss.google.dev
Google Books API: intitle / inauthor queries return zero results while plain queries succeed (October 2026)
On October 3, 2026, we reproduced an unexpected difference between plain searches and field-restricted searches in the Google Books API v1. The following requests use the same API key and network egress. All return HTTP 200, with no API error object: Query (q) Returned items flowers 10 intitle:flowers 0 Oliver Twist 10 intitle:Oliver 0 Charles Dickens 10 inauthor:"Charles Dickens" 0 Homer 10 inauthor:Homer 0 We reproduced these title and author contrasts against https:...