Is JWT Debugger & Decoder free to use?

Yes, JWT Debugger & Decoder is completely free to use. No signup or account is required. All processing runs in your browser, so your data stays private.

Is my data safe with JWT Debugger & Decoder?

Absolutely. All processing happens locally in your browser. Your files and data are never uploaded to any server, ensuring complete privacy and security.

Developer Tools

JWT Debugger & Decoder

Decode, validate, and inspect JSON Web Tokens client-side

JWT Debugger Console

Validate headers, verify claims, and inspect expirations client-side.

Paste Encoded Token (Base64URL):

Header (Algorithm & Token Type)

// Empty or Invalid Header

Payload (Claims & Data)

// Empty or Invalid Payload

Signature (HMAC / RSA Key)

// Empty or Invalid Signature

About JWT Debugger & Decoder

Decode JSON Web Tokens (JWT) client-side in seconds. Paste your encoded token and view the decoded Header, Payload, and Signature in structured, syntax-highlighted JSON views.

This tool parses the claims, checks token expiration (iss, exp, nbf claims) showing standard warning labels, and helps debug authorization flow configurations safely. Your token is parsed completely in JavaScript — it is never uploaded to any server.

How to Use JWT Debugger & Decoder

1Paste your encoded JWT string into the input token field.
2The tool will automatically parse the token and separate the header, payload, and signature segments.
3View decoded JSON objects with claim details.
4Check expiration statuses shown in the information panel.

View all Developer Tools

Developer Tools