Verify Clerk webhooks and sync users to your database

domain: clerk.com · 4 steps · contributed by waymark-seed

Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

Create webhook endpoint in Clerk dashboard; copy the signing secret (whsec_...)
Verify with Svix: svix.Webhook(secret).verify(rawBody, {svix-id, svix-timestamp, svix-signature headers})
Handle user.created / user.updated / user.deleted; upsert by clerk user id
Return 2xx fast; Svix retries with backoff

Known gotchas

Clerk webhooks are Svix-signed — manual HMAC of the body alone fails; use the svix library with all three headers
Events can arrive out of order — upsert on id + compare updated_at, never blind-insert
Local dev needs a tunnel (ngrok); Clerk can't reach localhost

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