JWT Decoder

Decode and inspect the header, payload, and signature of any JSON Web Token (JWT).

About JWT Decoder

Debugging authentication tokens? The Free JWT Decoder is the perfect tool for developers. It's the Best JWT Decoder to securely decode jwt token online. It reads payloads and headers entirely client-side, ensuring your tokens stay private.

Features

• Decodes JWT Header and Payload data instantly
• Pretty-prints the embedded JSON objects
• Identifies standard claims like "exp" (expiration) and "sub"
• Strictly local execution - extremely secure for private tokens
• Clear, color-coded interface

How to Use

1. Paste your raw JWT string (usually 3 base64 segments separated by dots).
2. The tool will instantly parse the token.
3. View the Header details on the top.
4. View the Payload (claims) on the bottom.

Frequently Asked Questions

Does this tool verify the JWT signature?

No, this tool only decodes the Base64 payload so you can read the contents. It does not cryptographically verify the signature against a secret.

Is it safe to paste production JWTs?

Yes! Our tool decodes the token entirely in your local browser using Javascript. No tokens are sent to any external server.

Why is the third part of the token unreadable?

The third part is the cryptographic signature. It is binary data representing the hash, not readable text.

What is the "exp" claim?

The "exp" claim represents the expiration time of the token, usually written as a Unix Timestamp.

Does the JWT decoder verify signatures?

No, it only decodes the Base64 header and payload. It does not validate the secret key.

Is it safe to paste a production JWT?

Yes, all decoding happens locally in your browser so your token is never compromised.

Can I see the expiration time?

Yes, the 'exp' claim is decoded and displayed in standard readable format.

Is this a free jwt decoder?

Yes, this free jwt decoder is available for all developers.

Is it safe to decode jwt token online here?

Yes, the best jwt decoder runs purely in the browser, meaning your tokens are never logged.