JWT デコーダー

JWT（JSON Web Token）のヘッダー、ペイロード、署名をブラウザ内でデコード・確認します。

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Drag & drop a file here, or click to browse

Input

Output

Privacy: This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.

Examples

Example 1

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Click "Example 1" above to load

Frequently Asked Questions

Q: Does it verify the JWT signature?

A: No, this tool only decodes (base64url decodes) the token parts for inspection.

Q: Is it safe to paste my token?

A: Yes, decoding happens entirely in your browser. Never share tokens containing production secrets.

Q: What is a JWT?

A: A JSON Web Token is a compact, URL-safe format for representing claims between two parties.

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Privacy & Security

This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.