Stripe·Fixpaymentsintermediate

Stripe Says Webhook Signature Verification Failed

Quick Answer

How do I fix Stripe Says Webhook Signature Verification Failed?

The raw request body must be used for signature verification, not the parsed JSON body. Start with "Use raw body for verification" before making broader code changes.

Fix signals

What this answers: Why stripe says webhook signature verification failed happens and what to change first.
Fastest move: Use raw body for verification
Use this page if: Error: webhook signature verification failed

If this keeps happening

Open the next decision, not just the patch

Use these when the current fix is helpful, but the real answer is a better tool choice, a cleaner workflow layer, or a more trustworthy launch path.

Tool picker

Open this when the payment problem is really making you question the app stack and workflow choice behind it.

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Lovable reviews

Open this when repeated billing drift makes you question whether the current generated full-stack path is still worth the cleanup cost.

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Cursor review

Open this when the next move is owning more of the billing and entitlement logic directly in code.

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Deploy hub

Open this when the payment bug is really part of a bigger production handoff and environment problem.

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Firecrawl review

Open this when the app also needs live data or richer infra decisions and the stack question is getting broader than Stripe itself.

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Quick Fix Summary

Most likely cause	The raw request body must be used for signature verification, not the parsed JSON body.
Fastest fix	Use raw body for verification
Use this page if	Error: webhook signature verification failed

Exact errors people search for

If one of these matches what you are seeing, you are likely on the right fix page.

Stripe says webhook signature verification failed
Webhook requests arrive but every event gets rejected
400 errors appear on the Stripe webhook endpoint

You're in the right place if...

!Error: webhook signature verification failed
!Webhooks received but rejected
!400 errors on webhook endpoint

Why this happens

The raw request body must be used for signature verification, not the parsed JSON body.

Fix

Use raw body for verification

The most common mistake — using parsed JSON instead of raw text:

// WRONG — body is already parsed:
const body = await req.json()

// CORRECT — use raw text:
const body = await req.text()

const event = stripe.webhooks.constructEvent(
  body,
  req.headers.get('stripe-signature'),
  process.env.STRIPE_WEBHOOK_SECRET
)

Prevent this next time

Always use req.text() (not req.json()) for the body in webhook handlers. This preserves the exact bytes Stripe signed.