JWT Parser
Decode and inspect the headers, payload claims, and signature structure of JSON Web Tokens (JWT) securely in your browser.
Header (Algorithm & Key ID)
Payload (Claims / Data)
Signature Block (Raw Base64URL)
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Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.
Is my JWT token transmitted to a server?
No. Decoding and parsing happen 100% locally in your browser using JavaScript. Your token, secrets, and claims are never sent to our servers.