ToolsJWT Decoder
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Decode and inspect JSON Web Tokens (JWT) including Header (ALGO), Payload (CLAIMS), and Signature without exposing your secret keys or tokens to third-party servers.
100% Client-Side Privacy
Tokens, code & payloads never leave your browser.
Zero Latency Execution
Instant processing via native browser Web APIs.
No Account Required
Unlimited, free access without paywalls or quotas.
Paste your encoded JWT (the string starting with eyJ...) into the token input box.
Review the decoded Header (algorithm & token type) and Payload claims (user ID, permissions, roles, expiration).
Verify if the token is still active, expired, or not yet valid based on unix timestamps.
Verify token claims, custom scopes, roles, and expiration times during authentication workflows in Laravel Sanctum/Passport, NextAuth.js, or Auth0.
// Standard Decoded JWT Payload Claims
{
"iss": "https://kodersolution.com",
"sub": "user_98412",
"aud": "api://backend",
"role": "admin",
"iat": 1725184800, // Issued at
"exp": 1725271200 // Expires at (24 hours later)
}Check why an API returns 401 Unauthorized by verifying if the `exp` claim has passed or if required permission scopes are missing.
No. JWT headers and payloads are merely Base64URL-encoded JSON objects, not encrypted. Anyone can decode and read the payload. The secret key is only required to sign or verify the authenticity of the signature.
No. The decoding is performed 100% client-side inside your browser. No tokens, secrets, or payloads are stored or logged.
Decoding extracts the readable JSON claims from the token without validating the signature. Verification uses a cryptographic secret or public key (e.g. RS256) to ensure the token was not tampered with by an attacker.
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