JWT Decoder for OAuth Debugging vs Hash Generator for Webhook Verification

Overview

JWT Decoder for OAuth Debugging

Decodes and inspects JWT access tokens, ID tokens, and refresh tokens from OAuth 2.0 and OpenID Connect flows. Reveals claims, scopes, issuer, audience, and expiration — essential for debugging authentication failures in modern web applications.

Best for:

✓ Debugging 403 Forbidden errors by inspecting token scopes
✓ Verifying token expiration (exp claim) for refresh logic
✓ Checking issuer (iss) and audience (aud) claims match expectations
✓ Inspecting custom claims (roles, permissions, tenant ID)

Hash Generator for Webhook Verification

Generates HMAC-SHA256 signatures to verify webhook authenticity — confirming that incoming webhooks are genuinely from the expected service (Stripe, GitHub, Slack) and have not been tampered with by attackers.

Best for:

✓ Verifying Stripe webhook signatures (HMAC-SHA256)
✓ Validating GitHub webhook payloads
✓ Debugging Slack event API signature verification
✓ Testing HMAC signature generation for custom webhook systems

Feature Comparison

Feature	JWT Decoder for OAuth Debugging	Hash Generator for Webhook Verification
Verification type	Token claims and expiry inspection	Payload integrity via HMAC signature
Auth protocol	OAuth 2.0, OpenID Connect	Webhook signature verification
What is verified	Who the user is and what they can access	That the payload is authentic and untampered
Cryptographic operation	Decode (read signed payload)	Hash (compute expected signature)
Secret required	Optional (inspect without verification)	Yes — shared secret for HMAC
Use in production code	Token validation middleware	Webhook handler signature check
Debugging scenario	401/403 errors, expired tokens	400 errors, webhook delivery failures
Works offline	Yes — client-side	Yes — client-side

Real Usage Examples

JWT Decoder for OAuth Debugging

Input

eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJhdXRoMC5jb20iLCJzdWIiOiJ1c2VyMTIzIiwiZXhwIjoxNzEzMTAwMDAwfQ.sig

Output

Issuer: auth0.com
Subject: user123
Expires: 2024-04-14T14:26:40Z
Status: EXPIRED

Hash Generator for Webhook Verification

Input

Webhook body: {"event":"payment.success"}
Secret: whsec_abc123

Output

HMAC-SHA256: 5d5b09c29d3f8b0e11e8b68c0e66eab73...

When to Use Each Tool

Use JWT Decoder for OAuth Debugging when...

Use JWT Decoder when debugging authentication issues — a user gets 403 Forbidden, and you need to check if their token has the right scopes, has not expired, and was issued by the expected identity provider.

Use Hash Generator for Webhook Verification when...

Use Hash Generator when setting up or debugging webhook integrations — verifying that incoming webhooks from Stripe, GitHub, or Slack have valid HMAC signatures, confirming they are authentic and have not been intercepted.

Use both together when...

In a payment flow: JWT Decoder verifies the user identity and permissions to initiate a payment, while Hash Generator verifies that the subsequent Stripe payment confirmation webhook is authentic and untampered.

Try Both Tools Free

Both tools run entirely in your browser — no signup, no data collection, no limits.

Open JWT Decoder for OAuth Debugging Open Hash Generator for Webhook Verification

Frequently Asked Questions

How do I verify a Stripe webhook signature?

Stripe sends an HMAC-SHA256 signature in the Stripe-Signature header. Compute HMAC-SHA256 of the raw request body using your webhook signing secret. If your computed hash matches Stripe signature — the webhook is authentic.

Why is my JWT token being rejected even though it looks valid?

Common causes: 1) Token is expired (check exp claim with JWT Decoder), 2) Wrong audience (aud does not match your API), 3) Wrong issuer (iss does not match your auth provider), 4) Missing required scopes/claims.

Are webhook secrets the same as JWT secrets?

No. JWT secrets (or private keys) are used to SIGN tokens at the identity provider. Webhook secrets are shared between services to verify payload authenticity. Different protocols, different secrets, different purposes.

Can I use the same tool for both JWT verification and webhook signatures?

They serve different purposes: JWT Decoder reads token contents (claims, expiry). Hash Generator computes digests for signature comparison. Some JWT libraries also verify signatures, but webhook HMAC verification is a separate concern.