JWT Decoder

Decode and inspect JSON Web Tokens instantly. View header, payload, and signature without sending data to a server.

Used 5,009 times

Paste a JWT token (three base64url-encoded parts separated by dots)

This tool only decodes the token — it does not verify the signature.

Header

Algorithm and token type

Payload

Claims and data contained in the token

Signature

Raw base64url-encoded signature (cannot be verified without the secret)

About JWT Decoder

What is a JWT?

  • JSON Web Tokens are compact, URL-safe tokens
  • Three parts: Header, Payload, Signature
  • Each part is base64url-encoded
  • Widely used for authentication and information exchange
  • Signature verification requires the secret key

Use Cases

  • Inspecting token claims (iss, sub, exp, iat)
  • Debugging authentication issues
  • Checking token expiry timestamps
  • Understanding JWT structure

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