
Package info and download stats on jsDelivr CDN.
jsDelivr API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
The public jsDelivr API. Get npm packages, files, versions, entry points, as well as their CDN URLs and download stats.
Details from github.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.
Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript
Check if any website is down, from two continents; live status, uptime history and TLS expiry
The jsDelivr API is provided by jsdelivr (github.com). The public jsDelivr API. Get npm packages, files, versions, entry points, as well as their CDN URLs and download stats.
Yes. The jsDelivr 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.
No. The jsDelivr API requires no authentication, so you can start making requests without signing up.
Yes. The jsDelivr API supports CORS, so front-end JavaScript can call it directly.
Yes. The jsDelivr API is served over HTTPS, so it's safe to use in production.