Interact with Docker Hub.
Docker Hub API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Docker Hub HTTP API reference, version 2-beta.
Details from docs.docker.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
DNS records, SPF/DMARC detection and TLS certificate expiry
Domain name search to find all domains containing particular words/phrases/etc
The Docker Hub API is provided by Docker Docs (docs.docker.com). Docker Hub HTTP API reference, version 2-beta.
Yes. The Docker Hub API is listed in the Development 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 Docker Hub API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Docker Hub API supports CORS, so front-end JavaScript can call it directly.
Yes. The Docker Hub API is served over HTTPS, so it's safe to use in production.