Supercheck

Free tool

API endpoint checker

Check a public GET or HEAD endpoint: status code, response time, content type, and whether the JSON parses.

This check runs in Supercheck.

The free checker isn't available on this site. The method below shows what it looks at.

Try it in Supercheck

How we check

  • We send one GET or HEAD request and follow up to 3 redirects.
  • JSON counts as valid when the content type mentions json and the body parses.
  • We show the Access-Control-Allow-Origin and Cache-Control headers as sent.

What this check can't tell you

  • One check from one Cloudflare data center, usually the one nearest you. It can't tell you whether the site is down for everyone.
  • Only GET and HEAD, without custom headers, a body or credentials.
  • JSON is parsed on the first 64 KB only.

Questions

Why can't I send a POST or an API key?
A public tool that sends requests with bodies or credentials could be used against other people's APIs. Authenticated checks are what Supercheck monitors are for.
Do you store the URL I check?
Results sit in a 10-minute cache. Logs keep the host and the first path segment, never the full URL or query string, and never your IP address.
Can I stop my site from being checked?
Yes. The SupercheckBot page explains how to ask for an opt-out; we add your domain to a block list.