📌 Overview

Decode a JSON Web Token (JWT) to inspect its header and payload. Views claims like exp and iat locally without sending the token anywhere.

🔐 JWT Decoder

Decode a JSON Web Token (JWT) to inspect its header and payload. Views claims like exp and iat locally without sending the token anywhere.

JWT

Header

Payload

🔒 All processing happens in your browser. No data is uploaded to any server.

📋 How to Use

Paste your JWT into the input box.
The header and payload are decoded instantly.
Review the claims and expiry time.
Nothing is uploaded — it is safe to inspect.

❓ FAQ

Does it verify the signature?

No. This tool only decodes the token for inspection. Signature verification requires your secret/key and should be done server-side.

Is my token sent anywhere?

No. Decoding is fully local in your browser, so it is safe for sensitive tokens.

What do exp and iat mean?

exp is the expiration time and iat is the issued-at time, both as Unix timestamps; we show them in readable form.

💡 Use Cases

🔑

Auth Debugging

Inspect claims during development.

⏰

Expiry Checks

See when a token expires.

🧪

Testing

Verify payload contents quickly.

🔗 Related Tools

📖 Deep Dive: JWT Decoder

Decode a JSON Web Token (JWT) to inspect its header and payload. Views claims like exp and iat locally without sending the token anywhere.

JWT Decoder is a free tool that runs 100% in your browser. No signup, no uploads — your data stays private. Perfect for everyday text and data tasks, saving you time and reducing mistakes.