JWT Decoder

Security100% Browser Processing

💡 What is JWT? JWT (JSON Web Token) is a token-based authentication method for securely transmitting information. Consists of header, payload, and signature.

Standard RFC 7519 - JSON Web Token

JWT Decoder decodes JWT (JSON Web Token) to separate and view header, payload, and signature components.

How to Use

  1. 1

    Paste JWT token into input field

  2. 2

    Header and payload are automatically decoded

  3. 3

    View token info: expiration, issuer, audience, etc.

  4. 4

    Verify signature algorithm and token structure

Use Cases

Debugging

Check and debug API authentication token contents.

Token Validation

Verify token structure and expiration time.

Development

Test JWT communication between backend and frontend.

Learning

Understand JWT structure and how it works.

What is JWT?

JWT is a secure JSON-format token with Header.Payload.Signature structure.

Header: Token type and signing algorithm info

Payload: User info and claim data

Signature: Signature ensuring token integrity

Frequently Asked Questions (FAQ)

Q.Do you verify signatures?

A. No. This tool only decodes. Signature verification requires secret keys and must be done server-side.

Q.Are JWTs encrypted?

A. No. JWTs are only Base64 encoded, not encrypted. Don't include sensitive info.

Q.Is my data safe?

A. Yes. All decoding happens in your browser and nothing is sent to servers.

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