tofo-boxtools

JWT Decoder

developer

Decode JSON Web Tokens and inspect header, payload, and signature.

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What is JWT Decoder?

JWT Decoder is a free online developer utility. Decode JSON Web Tokens and inspect header, payload, and signature. It runs entirely in your browser, making it fast and accessible without any setup or installation.

How to Use JWT Decoder

  1. 1

    Paste your JWT token into the input field. A JWT has three parts separated by dots.

  2. 2

    The tool decodes and displays the Header (algorithm and token type), Payload (claims and data), and Signature.

  3. 3

    Check the expiry time (exp claim) and issued-at time (iat claim) to verify token validity.

  4. 4

    Note: This tool only decodes — it does not verify the signature. Never share tokens containing sensitive data.

Common Use Cases

  • →Speeding up repetitive development tasks.
  • →Validating and transforming data during debugging.
  • →Generating test data for development and QA environments.

Frequently Asked Questions

What is a JWT?

A JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It consists of three Base64URL-encoded parts separated by dots: Header (algorithm), Payload (claims), and Signature.

Does this tool verify the JWT signature?

No. This tool only decodes the header and payload — it does not verify the signature. Signature verification requires the secret key or public key used to sign the token, which should never be shared publicly.

What are JWT claims?

Claims are statements about the user or token stored in the payload. Standard claims include: sub (subject/user ID), exp (expiry time), iat (issued at), iss (issuer), and aud (audience). Custom claims can contain any application-specific data.

Is it safe to paste my JWT here?

JWTs are not encrypted by default — the payload is only Base64-encoded and can be decoded by anyone. However, avoid pasting tokens that contain sensitive data or are still valid for production systems. Use test tokens when possible.

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