verified_user JWT Decoder & Debugger

Decode, verify, and generate JSON Web Tokens (JWT) instantly. 100% client-side and secure.

lock Privacy First: All JWT processing happens in your browser. Tokens are never sent to any server.

code Encoded JWT

data_object Decoded JWT

Decoded JWT will appear here...

shield Signature Verification

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Frequently Asked Questions

What is a JWT token?

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It's commonly used for authentication and authorization in web applications.

How do I decode a JWT?

Simply paste your JWT token into the "Encoded JWT" field. The tool will automatically decode and display the header, payload, and signature in readable JSON format.

Is it safe to decode my JWT here?

Yes! All JWT decoding and verification happens entirely in your browser using JavaScript. Your tokens are never sent to any server or stored anywhere. However, be cautious with production tokens containing sensitive data.

What are the three parts of a JWT?

A JWT consists of three parts: Header (algorithm and token type), Payload (claims/data), and Signature (verification). These parts are separated by dots (.) and Base64-encoded.

How do I verify a JWT signature?

Enter your secret key or public key in the "Signature Verification" section, select the correct algorithm (HS256, RS256, etc.), and click "Verify" to check if the token is valid.

What algorithms are supported?

We support HMAC (HS256, HS384, HS512), RSA (RS256, RS384, RS512), and ECDSA (ES256, ES384, ES512) algorithms for JWT signing and verification.

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