Does this verify the signature?

No — this tool only decodes and displays the header and payload. It does not verify the signature, since that requires the secret key.

JWT Decoder

Decode and inspect JWT tokens

Token

Header

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

Payload

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

Signature (unverified)

SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

A JWT has three Base64URL-encoded parts separated by dots: header.payload.signature. This tool decodes the header and payload.

Example 1

A standard HS256 JWT

Header shows alg and typ; payload shows claims like sub and name

Format, beautify, and minify JSON data instantly

Validate JSON syntax and find errors

Encode text or files to Base64

Decode Base64 strings back to text