JSON Formatter
Format, minify and validate JSON with useful syntax errors.
Developer toolsJWT Decoder
Decode JWT headers and payloads locally without trusting the signature.
Processed locally in your browser — your data is not uploaded.Loading your tool…
How to use JWT Decoder
- Paste a three-part JWT.
- Decode its header and payload as formatted JSON.
- Review timestamp claims and copy only what you need.
Does decoding verify a JWT?
No. Decoding a JWT does not verify that its signature is valid or that its claims are trustworthy.
No sign-up is required. The calculation or transformation happens in this browser tab and the result is available immediately.
Good to know
Which timestamps are interpreted?+
Numeric exp, iat and nbf claims are shown in UTC and browser-local time.
Is the token stored?+
No. It remains only in the current page state.
Is my input uploaded?+
No. Processing happens in this browser tab and the tool does not send your input or result to Metyris.