JWT Decoder (No Secret)
Inspect JWT headers and payloads safely without providing a signing key.
How to Use This Tool
- 1
Paste a full JWT (header.payload.signature) into the input field.
- 2
Click Convert to decode the token locally in your browser.
- 3
Review the formatted header and payload JSON. No signature verification occurs.
Features
Base64URL decoding with helpful errors
Displays whether a signature segment exists
Never transmits tokens across the network
Common Use Cases
- •
Debug OAuth/OpenID Connect integrations
- •
Verify claim names and custom namespaces
- •
Check exp, iat, and aud values during QA
About This Tool
Drop any JSON Web Token to reveal the header and payload claims in seconds. Great for debugging auth flows, verifying claim names, and spotting expiration issues.
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Frequently Asked Questions
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