Synvara

JWT Decoder

Paste a JSON Web Token to instantly decode the header, payload, and signature locally in your browser. No data is sent to any server.

Encoded Token

Decoded Data

Header (Algorithm & Type)
{
  // Awaiting token input...
}
Payload (Data & Claims)
{
  // Awaiting token input...
}
Verify Signature
hmacSha256(base64UrlEncode(header) + "." + base64UrlEncode(payload), secret_key)