JWT Debugger

Securely decode, verify, and edit JWTs locally in your browser.

Encoded JWT

HEADER

PAYLOAD

SIGNATURE

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100% Local Processing: Data is processed securely in your browser without server uploads.
Base64Url Normalization: Accurately decodes multi-byte characters preventing garbled text.
Real-time Validation: Automatically checks expiration (exp) and visualizes security risks.
Two-way Editing: Edit the JSON payload to instantly re-encode into a new JWT in real-time.