JWT Decoder
🤖 Agent ReadyDecode and inspect JWT tokens — header, payload, signature
Frequently Asked Questions
Does this JWT decoder verify signatures?
No — this tool decodes JWT header/payload and shows claims in your browser. Signature verification requires your secret key (HS256) or public key (RS256/ES256).
How do I check if a JWT token is expired?
Look at the exp claim in the payload. This tool compares exp to the current time and labels the token as expired or valid.
Can I decode malformed JWT tokens?
Only correctly structured JWTs (header.payload.signature) can be decoded. If parsing fails, check for missing sections, invalid Base64URL, or copied whitespace.
Is my token uploaded anywhere?
No. Decoding runs client-side in your browser.
Related Tools
Working with auth and API payloads? Decode tokens, inspect JSON claims, and safely encode/decode values in one flow.