Webhook Signature Simulator & Localhost Dispatcher
Generate HMAC-SHA256 signatures for Stripe, GitHub, Shopify, and Razorpay, and dispatch mock webhooks to localhost.
Simulate cryptographically valid HMAC-SHA256 webhook signatures for Stripe, GitHub, Razorpay, Shopify, Paddle, and Clerk, and dispatch mock webhooks directly to your local API endpoints without third-party tunnels.
Webhook Signature Simulator & Localhost Dispatcher
Generate HMAC-SHA256 signatures for Stripe, GitHub, Shopify, and Razorpay, and dispatch mock webhooks to localhost.
Standard Stripe checkout webhook with timestamped v1 HMAC-SHA256 signature verification.
Signed using HMAC-SHA256 with timestamp prepended: t={ts}.{payload}
Dispatches a live HTTP POST directly from your browser with accurate provider signature headers.
import crypto from 'crypto';
export function verifyWebhookSignature(rawBody: string, signature: string, secret: string): boolean {
const expectedSignature = crypto
.createHmac('sha256', secret)
.update(rawBody)
.digest('hex');
return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expectedSignature));
}Share This Tool
Help your team and fellow developers save time with free, private client-side utilities.
Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools
How to Use Webhook Signature Simulator & Localhost Dispatcher
Select Provider
Choose your webhook platform (Stripe, GitHub, Razorpay, Shopify, Paddle, Clerk, or Custom HMAC).
Enter Signing Secret & Payload
Provide your webhook signing secret and edit the test JSON event payload.
Review Computed Signature Header
Inspect the generated header (e.g. Stripe-Signature with UNIX timestamp prefix).
Dispatch to Localhost
Enter your local server URL (e.g. http://localhost:3000/api/webhooks) and send a live HTTP POST.
Practical Examples & Conversions
Payload: {"type": "payment_intent.succeeded"}, Secret: "whsec_..."Stripe-Signature: t=1700000000,v1=6d7f3e8a...
Frequently Asked Questions (PAA)
HMAC-SHA256 Webhook Signature Verification: RFC 2104 Internals and Provider Formats
How HMAC keyed hashing works under RFC 2104, why hash(key + message) is broken, and how to verify Stripe, GitHub, and Shopify signatures correctly with raw bodies and constant-time comparison.
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Authoritative Standards & Citations
Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:
RFC 7519: JSON Web Token (JWT)
Standardized compact, URL-safe means of representing claims to be transferred between two parties.
Web Cryptography API Specification
Standard JavaScript API for performing basic cryptographic operations in web applications.
RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace
Definition of uniform format and generation algorithms for UUIDs.