JWTデコーダー

JSON Web Tokenをデコード。ヘッダー、ペイロード、署名を表示。

JWT Token

About JSON Web Tokens

JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. A JWT consists of three parts: Header (algorithm & type), Payload (claims & data), and Signature (verification). JWTs are commonly used in OAuth 2.0, OpenID Connect, and API authentication.

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JDJWT Token Decoder JPJWT Parser JVJWT Validator →BBase64 Decoder

How to Use

Paste your JWT token in the input field
The header, payload, and signature are decoded automatically
View expiration time and other claims
Copy decoded sections as needed

Common Use Cases

Debugging authentication tokens
Inspecting JWT claims and expiration
Verifying token structure during development
Understanding OAuth2 and API tokens

Frequently Asked Questions

What is a JWT?

JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It contains a header, payload, and signature.

Is it safe to decode JWTs here?

Yes. Decoding happens entirely in your browser. No tokens are sent to any server. Note: decoding only reads the token — it does not verify the signature.

Can this tool verify JWT signatures?

This tool decodes and displays the token contents. Signature verification requires the secret key, which should not be entered into any online tool.