JWT Online Debugger & Decoder

Decode JSON Web Token headers and payloads with automatic validity and expiration countdown

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JWT 除錯驗證 100% Procesamiento Local en Navegador

Ingrese Token JWT (tres partes separadas por puntos)

Header.Payload.Signature

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkFsZXgiLCJpYXQiOjE1MTYyMzkwMjJ9.XbPfbIHMI6arZ3Y922BhjWgQzWXcXNrz0ogtVhfEd2o

Encabezado (Header)HS256

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

Carga útil (Payload)

Emitido en (iat): 1/18/2018, 1:30:22 AM

{
  "sub": "1234567890",
  "name": "Alex",
  "iat": 1516239022
}

Firma (Signature)

HMAC-SHA256 (base64url): XbPfbIHMI6arZ3Y922BhjWgQzWXcXNrz0ogtVhfEd2o

Offline client-side JWT parser. Decode header, payload claims, and check expiration (exp) and issued-at (iat) timestamps securely.

Preguntas Frecuentes

Is it safe to paste JWT tokens into this online tool?

Completely safe. Processing happens entirely in your local browser window without transmitting tokens to any server.

How does the tool check token expiration?

It parses exp and nbf timestamp claims and compares them to your current UTC system clock.

Automatic type inference with Serde macro injection and camelCase to snake_case conversions

Infers nested types and generates TypeScript interfaces and Zod schema validators

Generate Java 17 Records and POJO classes with automatic Jackson annotations and Lombok tags

Fast percent-encoding conversion with component mode and full URL decoding

Bidirectional conversion between Unicode characters, \uXXXX, and HTML entities

Accurate syntax error line pointers, instant indentation beautification, and minification