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JWT Decoder Online

Decode JWT tokens online for free. View header, payload, claims, and signature. Check expiration time and validate JWT structure instantly.

Free Online JWT Decoder

Decode any JSON Web Token (JWT) instantly in your browser. This tool parses the Base64URL-encoded header and payload, displays all claims, and checks token expiration. All processing happens client-side for maximum security.

How to Decode a JWT Token

  1. Copy your JWT token from your application, API response, or browser developer tools
  2. Paste the token into the input field above
  3. Click "Decode JWT" to see the header, payload, and signature
  4. Review the claims including issuer (iss), subject (sub), and expiration (exp)

Frequently Asked Questions

Is it safe to decode JWT tokens online?
Yes, this JWT decoder processes everything in your browser. Your token is never sent to any server. However, remember that JWT headers and payloads are only Base64URL-encoded (not encrypted), so avoid putting sensitive information in JWTs.
What is the difference between decoding and verifying a JWT?
Decoding a JWT means reading the header and payload by Base64URL-decoding them. Anyone with the token can do this. Verifying a JWT means checking the signature using the secret key or public key to confirm the token has not been tampered with. This tool decodes JWTs but does not verify signatures.
How do I know if my JWT token has expired?
Look at the "exp" (expiration) claim in the payload. It contains a Unix timestamp indicating when the token expires. This tool automatically checks the expiration and shows whether your token is still valid or has expired.
What are the common JWT claims?
The most common registered JWT claims are: iss (issuer), sub (subject/user ID), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (JWT ID). Applications may also include custom claims like "role", "email", or "name".

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