How to Decode a JWT in Your Browser Without Exposing It to Third Parties

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A JSON Web Token (JWT) consists of three Base64URL-encoded segments — header, payload, and signature — joined by dots, and its contents can be read by anyone who holds the token without needing a secret key. Decoding can be done directly in a browser console using a one-line JavaScript command, avoiding the need to paste tokens into online tools that may transmit them to external servers. Security experts warn that decoding a token is not the same as verifying it; only server-side signature validation, combined with checks on expiry, issuer, and audience fields, confirms whether a token should be trusted. A common vulnerability arises when applications blindly accept the algorithm specified in the token header, including the insecure 'none' algorithm, which can be exploited by attackers. Users are advised to avoid pasting production tokens into untrusted decoders, use test tokens where possible, and revoke any credentials that may have been exposed.

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