JWT Decoder
Decode JSON Web Tokens and inspect header and payload details.
Paste a token to instantly decode its structure.
About this tool
A JSON Web Token (JWT) consists of three Base64URL-encoded parts separated by dots: the header (algorithm and token type), the payload (claims/data), and the signature. This tool decodes the header and payload so you can inspect their contents. Note: this tool does NOT verify the signature — it only decodes and displays the data. Never share tokens containing sensitive data in untrusted tools; this one processes everything locally in your browser.