How to Use the JWT (JSON Web Token) Decoder
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1
Paste your encoded JSON Web Token (JWT) into the input box.
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2
The token will be split into Header (red), Payload (purple), and Signature (blue).
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3
Inspect formatted JSON claims with syntax highlighting.
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4
Check the live token status badge: "ACTIVE" or "EXPIRED" with human-readable timestamps (iat, exp, nbf).
Practical Example & Use Case
Common Real-World Scenario
Inspecting auth claims, user roles, audience (aud), and expiration deadlines on OAuth2 / OpenID Connect tokens during API development.
Technical Notes & Limitations
Browser Engine Architecture
Performs client-side base64url decoding and claim verification. Cryptographic signature verification requires your private key which should never be exposed in a browser.
Frequently Asked Questions
Is it safe to paste confidential tokens here?
Yes! Unlike remote websites, WebUtilities decodes tokens 100% inside your browser memory. No token is ever transmitted over the network.