What information does the JWT decoder show?

It decodes and displays the JWT Header (algorithm, type), Payload (claims like sub, iat, exp), and Signature separately with color-coded JSON highlighting.

Can I check if a token is expired?

Yes, the decoder automatically converts the exp (expiration) and iat (issued at) claims to readable dates and shows a validity indicator with expiration countdown.

Is my token sent to a server?

No, all decoding happens entirely in your browser. Your JWT, including any sensitive payload data, never leaves your device.

JWT Decoder

Safely decode and inspect JSON Web Tokens (JWT) locally in your browser. Verify headers, payload, and signature without sending tokens to any server.

JWT Token

Header

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

Payload

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

Signature Verification

Verify Secret (HS256 only)

Secret is Base64 encoded

About

Instant decoding of JWT Header, Payload, and Signature
Color-coded syntax highlighting for JSON structures
Automatic expiration (exp) and "issued at" (iat) date conversion
Token validity indicator and expiration countdown
Support for multiple signing algorithms (HS256, RS256, etc.)
100% client-side execution for maximum security and privacy

ToolkitApp.net

JWT Decoder

Signature Verification

About

FAQ

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