JWT Decoder Online — Decode JSON Web Tokens
Decode and inspect JWT (JSON Web Token) headers, payloads, and claims.
Frequently Asked Questions
How do I decode a JWT token online?
Paste your JWT token into the input box. Our decoder instantly splits and decodes the header (algorithm info) and payload (claims data) into readable JSON.
Is my JWT token safe when decoded here?
Yes! All decoding happens entirely in your browser using JavaScript. No data is sent to any server. Your tokens remain completely private and secure.
Can this verify JWT signatures?
This tool decodes and displays JWT contents (header and payload). Signature verification requires the secret key or public key and is not performed client-side for security reasons.
What JWT claims can I see?
All standard claims are displayed: sub (subject), iss (issuer), exp (expiration), iat (issued at), aud (audience), and any custom claims in the payload.
Privacy First: All processing happens directly in your browser. Your data never leaves your device.