Validating JSON Payloads From Webhooks
Validating JSON payloads from webhooks: signature verification, schema validation, idempotency, and error handling for Stripe, GitHub, and others.
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Tags: json, api, developer-tools
Validating JSON Payloads From Webhooks Receiving a webhook without verifying its signature is equivalent to accepting anonymous mail and acting on its instructions without confirming who sent it. Any attacker who knows your webhook endpoint URL can send fabricated payloads that your application will process as legitimate events. Signature verification is the minimum viable security requirement for any production webhook integration. This guide covers how to implement it correctly for the two most common platforms, and the subtleties that cause incorrect implementations to silently pass. Why Raw Body Preservation Is Critical The single most common webhook verification bug is computing the HMAC over a re-serialized JSON object instead of the original request bytes. Here is the failure mode:…
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