JWT Decoder
Decode JWT header and payload sections so you can inspect claims without verifying the signature.
What this tool does
HMAC signatures combine a message with a secret key. They are commonly used to verify webhook payloads and protect request integrity.
How to use it well
Start with a small sample, check the output, then paste the full text when the result looks right. For important production data, review the output before saving or sharing it.
Common uses
- Test webhook signatures
- Check API examples
- Compare backend HMAC output
Guide
HMAC Signatures Explained for API and Webhook Testing
Understand how a message, secret and hash algorithm combine to create a verifiable signature.
Read guide