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

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