Useful APIs.
Clear starting points.

How the examples were checked

Each example was requested without credentials and with an Origin header. The full response was parsed as JSON, then checked for useful data, error objects, and redirects. The CORS label records the response header observed in that request.

Two HTTP 200 responses needed correction: REST Countries v3.1 returned a deprecation error, and Open Library work OL45883W returned a redirect record. The catalog uses World Bank country data and a direct Open Library search instead.

Download the check evidence · REST Countries migration notice · Original Open Library response