Developer tool / Token
JWT Decoder
Inspect JWT headers and payloads locally in your browser with clear warnings that decoding is not signature verification.
Token input
Paste a three-part JWT. Encrypted five-part JWE tokens are not supported in this version.
Header
Algorithm and token metadata
Payload
Claims are decoded, not trusted
How to use it
- 1 Paste a three-part JWT into the input panel.
- 2 Review the decoded header, payload, and time claims locally.
- 3 Copy the sections you need without sending the token anywhere.
Useful for
- Inspecting API auth tokens during development
- Checking JWT claim names and time values
- Debugging token shape without using an external decoder
Good to know
- This tool decodes tokens but does not verify signatures, issuers, audiences, or permissions.
- Encrypted JWE tokens are not supported in this version.
- Decoded claims are readable JSON, not proof that a token is safe or valid.
Questions
JWT Decoder FAQ
Does the JWT Decoder upload my token?
No. The header and payload are decoded entirely inside your browser. Utilshub does not receive the token or decoded claims.
Does decoding verify the JWT signature?
No. This version only decodes the readable header and payload. It does not verify the signature, issuer, audience, expiration policy, or trustworthiness of the token.
Can it decode encrypted JWT or JWE values?
No. This first version is for standard three-part JWT values only. Five-part encrypted JWE tokens are rejected with a clear message.
Why are iat, nbf, and exp shown as dates?
Those common claims are Unix timestamps in seconds. The tool converts them into readable UTC dates so you can inspect token timing faster.
Continue locally
Related tools
Keep working with another browser-only tool. Your files and tool inputs stay on your device.