JWT Converter

Decode, verify, and generate JSON Web Tokens securely right in your browser with real-time validation.

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Encoded Token

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Decoded Data

Header

Payload

Signature

HMACSHA256(

base64UrlEncode(header) + "." +
base64UrlEncode(payload),

)

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Understanding JSON Web Tokens

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

Our JWT Converter provides a premium, browser-side experience for developers to inspect and debug tokens without compromising security. Every byte is processed locally on your machine, ensuring your sensitive authentication data never touches our servers.

The Header

Contains the algorithm and token type. Decoded first to understand how to process the payload.

The Payload

Contains the claims (data). This is the heart of the token where user information is stored.

The Signature

Ensures the token hasn't been altered. Verified using a secret or public key.

Security Best Practices

Local Verification

Always verify JWTs on your server using a trusted library. Never trust client-side data without cryptographic verification of the signature.

No Sensitive Data

JWTs are encoded, not encrypted by default. Never store passwords, API keys, or sensitive PII inside the payload claims.

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