Secure JSON Web Token Decoder
JSON Web Tokens (JWT) are the standard for securely transmitting session data between parties as a JSON object. Because the payload is merely Base64Url encoded (not encrypted), developers often need to inspect the claims inside the token during debugging. Our JWT Decoder easily unwraps the token to reveal its hidden data.
Does decoding a JWT compromise security?
No. A standard JWT payload is designed to be public and readable by anyone who holds the token. The security of a JWT relies entirely on its Signature, which prevents tampering. You should never store highly sensitive information like passwords or credit card numbers inside a JWT payload.
Privacy
While JWT payloads shouldn't contain critical secrets, they often contain internal user IDs, email addresses, and active session identifiers. Pasting your active session tokens into a random server-side decoder is extremely risky. Our JWT decoder runs 100% locally in your browser. We do not transmit or log your tokens.