Access all the content the Guardian creates, categorised by tags and section.
The Guardian API is a free News API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from open-platform.theguardian.com.

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The The Guardian API is provided by The Guardian (open-platform.theguardian.com).
Yes. The The Guardian API is listed in the News category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The The Guardian API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the The Guardian API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The The Guardian API is served over HTTPS, so it's safe to use in production.