JWT Decoder

Decode and inspect JSON Web Tokens.

Encoded JWT

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

Features

Instant Decoding

See the header and payload of a JWT as you paste it in.

Formatted Output

Displays the decoded JSON in a clean, readable format.

Error Handling

Notifies you if the token is malformed.

About JWT Decoder

A client-side tool to decode and inspect the contents of a JSON Web Token (JWT). Simply paste your token to view the header and payload in a beautified JSON format. It's a quick and secure way to debug JWTs without exposing them to a server.

How to Use JWT Decoder

Paste your JWT: Enter the full JWT string into the input field.
View decoded parts: The tool will instantly display the decoded Header and Payload.
Inspect the data: Review the contents of the token. Note: This tool does not verify the signature's authenticity.