JWT Decoder
Decode and inspect JSON Web Tokens instantly. View header, payload, and signature without any backend.
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ALGORITHM: HS256HEADER: ALGORITHM & TOKEN TYPE
{
"alg": "HS256",
"typ": "JWT"
}PAYLOAD: DATA
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022// Jan 18, 2018, 1:30 AM
}Token Structure Valid
ValidThe token structure is valid using the HS256 algorithm. The payload hasn't been tampered with.
Private & Local
Decoding is performed entirely in your browser. Your sensitive JWT strings never leave your machine.
Timestamp Conversion
Claims like iat, exp, and nbf are automatically converted to human-readable dates.
Structure Analysis
Identifies common issues like missing headers, invalid padding, or non-JSON formatted segments.