
URL shortener and link management.
Bitly API is a free URL Shorteners API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from dev.bitly.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
URL shortener service
Monitor, compare and optimize your marketing links
Shorten a long URL easily and fast
The Bitly API is provided by Bitly Developer (dev.bitly.com).
Yes. The Bitly API is listed in the URL Shorteners 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 Bitly API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Bitly API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Bitly API is served over HTTPS, so it's safe to use in production.