JWT Inspector & Token Decoder
100% Client-Side • Local Browser ProcessingEncoded JWT Token
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Encoded JWT Token
Header
Awaiting token input
Payload
Awaiting token input
Signature
Signature verification requires the secret key and is not performed client-side.
Local browser processing • No token data sent to any server
100% Client-Side Decoding
JWT decoding uses native atob/TextDecoder APIs. Your token never leaves your browser.
Expiration Validation
Live exp claim validation shows whether the token is currently active or expired with exact timestamps.
Syntax Highlighted Output
Header and payload are rendered with full JSON syntax highlighting for easy inspection.
Open & Client-Side
Built for Daily Developer Workflows
Free, browser-based utilities that format, validate, and convert data locally. No accounts, no ads, no backend data collection.