URLpipe
Turn a URL into Markdown, screenshots, metadata or Lighthouse audits, rendered in real Chrome

203 JSON endpoints: hashing, encoding, unit conversion, text, dates and file conversion.
Utilorax 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.
A free, fast JSON API for developer utilities: hashing, Base64, URL encoding, JSON to TypeScript, CSV to JSON, slugify, UUID and more. Free key, 500/month.
Details from utilorax.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.
Turn a URL into Markdown, screenshots, metadata or Lighthouse audits, rendered in real Chrome
Deterministic utilities: IBAN/VAT validation, cron parsing, regex, diffs, Dutch holidays, test data
The Utilorax API is provided by Utilorax (utilorax.com). A free, fast JSON API for developer utilities: hashing, Base64, URL encoding, JSON to TypeScript, CSV to JSON, slugify, UUID and more. Free key, 500/month.
Yes. The Utilorax 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 Utilorax API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Utilorax API supports CORS, so front-end JavaScript can call it directly.
Yes. The Utilorax API is served over HTTPS, so it's safe to use in production.