JWT decoder
Decode a three-part token and inspect its contents with a clear verification warning.
Read the JSON header and payload of a JWT without verifying it.
About this tool
The JWT decoder reads the Base64 URL encoded header and payload from a JSON Web Token and formats both as JSON. It also tells you whether a signature segment is present. The signature is not verified, so the decoded claims must never be treated as trusted or authentic. Use this tool for non-sensitive test tokens, debugging token structure, or checking claim names and timestamps before proper verification in your application.