JWTデコーダー
Decode a JSON Web Token (JWT) online, free. View the header and payload instantly. Client-side only, your token never leaves your browser.
使い方 JWTデコーダー
- Paste your JSON Web Token (it starts with "eyJ").
- Click "Decode".
- Read the decoded header and payload.
よくある質問
Does this verify the signature?
No, it only decodes the header and payload for inspection. It does not validate the signature or trust the token.
Is my token sent anywhere?
No. Decoding happens entirely in your browser; your token never leaves your device.