Custom Claims Decoder
Free online custom claims decoder. Decode, inspect, and debug custom claims JWT tokens. View header, payload, and signature claims. 100% browser-based, no uploads required.
What Is This?
Debugging and inspecting custom claims tokens is essential for authentication, authorization, and API security. Our free custom claims decoder helps developers decode custom claims JSON Web Tokens directly in their browser. All processing happens client-side — your tokens never leave your device. No sign-up required.
How to Use
Paste your custom claims token
Copy your custom claims JWT token and paste it into the decoder input field.
Decode the token
Click Decode to inspect the header, payload, and signature of your custom claims token.
Verify claims
Review the decoded claims including issuer, subject, expiration, and custom claims to ensure the token is valid.
Examples
Free custom claims decoder with no sign-up required
Instant token decoding with header, payload, and signature
Automatic Base64URL decoding
Expiration and claim validation
100% browser-based — tokens never leave your device
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Frequently Asked Questions
What is a custom claims token?
A custom claims token is a JSON Web Token used for custom claims authentication and authorization in web applications and APIs.
Is it safe to decode my JWT here?
Yes, all decoding happens entirely in your browser. Your tokens are never transmitted or stored.
Can I verify the signature?
The decoder parses and displays the header and payload. Use our JWT verifier to validate signatures with your secret key.