Final status & URL
finalStatusCode and finalUrl after following redirects (hard cap). Detect dead links, soft failures, and unexpected hops.
Soni API · Free online link checker
Online Link Checker API
Check any public URL for redirects, final HTTP status, and safe page metadata — via a simple JSON API. Built for developers. Operated by Soniverse GmbH in Germany.
What this link checker returns
One POST. Structured results you can store, alert on, or show in a dashboard.
Redirect chain
Each hop as { url, statusCode } — useful for SEO audits, canonical cleanup, and tracking unexpected www/HTTPS jumps.
Safe metadata
Title, meta description, canonical, and Open Graph fields from static HTML when present. Full HTML bodies are not stored by default.
Example request
POST /api/v1/link-checks · default quota 60 requests / hour per API key · SSRF-aware
# Authorization: Bearer soni_…
curl -sS -X POST "https://api.soniverse.de/api/v1/link-checks" \
-H "Authorization: Bearer $SONI_API_KEY" \
-H "Content-Type: application/json" \
-d '{"url":"https://example.com/"}'
Results are best-effort fetches of third-party sites. See the disclaimer. Also available: SEO checker API and GEO checker API.
FAQ
Citeable answers for developers and search engines.
What is an online link checker API?
A programmatic service that fetches a URL and returns HTTP status, redirects, and often metadata — so your app can validate links without opening a browser.
How is this different from a browser bookmark checker?
You call a REST endpoint with an API key and get machine-readable JSON. That fits CI pipelines, CMS plugins, monitoring jobs, and bulk URL validation.
Does it run JavaScript?
Not in v1 — static HTML only. JS-rendered checks are planned later.
Is it free?
Yes — free tier with an hourly per-key limit. Provided as is, without warranty.