How to Decode JWT Tokens Directly in Your Browser Without a Backend

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JSON Web Tokens (JWTs) are widely used in modern authentication systems like OAuth and OpenID Connect, but their contents can be inspected without any backend or external library. A JWT consists of three base64url-encoded parts — header, payload, and signature — separated by dots, and the payload can be decoded entirely within a browser using basic JavaScript. Decoding a JWT reveals standardized claims such as issuer, subject, expiration time, and custom fields like user roles or permissions. However, decoding does not verify the token's signature, which requires the server's secret or private key to confirm authenticity. Security best practices include whitelisting signing algorithms, avoiding localStorage for token storage due to XSS risks, and always validating the expiration claim server-side.

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