Documentation

Complete guide to webhooks, debugging, and real-time event monitoring with HookMetry

Stripe Webhook Signature Verification Failed? No signatures found?

Problem Introduction

Stripe webhooks are hitting your endpoint, but validation throws "No signatures found matching the expected signature for payload".

Why It Happens

  • •Body-parser consumed the raw stream before verification
  • •Using API Key instead of Webhook Secret (whsec_)
  • •Accidental quotes around the ENV variable
  • •Timestamp replay exceeding 5-minute tolerance

Step-by-Step Fix

  1. 1Ensure you are passing the exact raw Buffer/String to the Stripe library, not a parsed JSON string.
  2. 2Double check your webhook secret starts with "whsec_".
  3. 3Remove any literal quotes around the secret in your .env file.
  4. 4If testing via Stripe Dashboard replays, be aware timestamps may be expired.
  5. 5Send a test webhook using CLI or Hookmetry.

Common Mistakes

  • •Using express.json() before express.raw()
  • •Using sk_test_ instead of whsec_
  • •Calling JSON.stringify on req.body to rebuild the string

Debugging Workflow

Receive raw bytes -> strip whsec_ -> calculate HMAC-SHA256 -> compare securely.

Preventive Best Practices

  • •Use Hookmetry to instantly diagnose structural anomalies in Stripe payloads

Works with webhooks and other async event systems (including AI callbacks).

Instead of guessing, inspecting the exact payload and headers can help debug faster. Tools like Hookmetry support this workflow.

Try the free webhook tester

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