Test Amazon SNS webhooks
Amazon SNS sends webhooks for each message published to a subscribed topic, plus SubscriptionConfirmation and UnsubscribeConfirmation messages. Capture them on a free webhooks.cc endpoint to see exactly what Amazon SNS sends, then replay deliveries or forward them to your local handler.
No credit card · 50 requests/day free · or get a guest URL without an account
Prefer a walkthrough? Read the local webhook testing guide.
How to test Amazon SNS webhooks
- 1
Create a webhook endpoint
Sign in free with GitHub, Google, or email to create a persistent endpoint — or grab an instant guest URL at webhooks.cc without an account.
- 2
Point Amazon SNS at your URL
Paste the endpoint URL into Amazon SNS: SNS console → Subscriptions → Create subscription (protocol HTTP or HTTPS), or the Subscribe API.
- 3
Inspect what arrives
Each delivery appears live in the dashboard with method, headers, body, query parameters, and source IP.
- 4
Forward to localhost or assert in CI
Run whk tunnel <port> to forward webhooks to a local server, or use the TypeScript SDK to wait for and assert on deliveries in tests.
Amazon SNS webhook authentication
| Algorithm | RSA-SHA1 |
|---|---|
| Verification in webhooks.cc | Capture deliveries to inspect raw signature material |
Signed in the JSON body, not a header: a base64 RSA Signature (SHA1 for SignatureVersion 1, the default; SHA256 for 2) over newline-separated field names and values. Fetch SigningCertURL only if it is an HTTPS sns.*.amazonaws.com URL, and GET SubscribeURL only after the signature verifies.
New to signature verification? Read the webhook signature verification guide.
Everything in one place
- Live dashboard — see deliveries the moment they arrive
- Forward to localhost with whk tunnel
- Replay any captured request to any URL
- Mock responses with custom status, headers, and body
- TypeScript SDK assertions for CI
- MCP server for AI coding agents
Amazon SNS webhook questions
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Sign up free, create an endpoint, and point Amazon SNS at it.
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