sarwarfx // jwt
HUB
AUTH_SECURITY // ZERO_LOG_CLIENT_DECODER

JWT TOKEN INSPECTOR & CLAIMS AUDITOR

Decode encoded JWT tokens, analyze payload claims, verify signature encoding, and inspect live expiration countdown timers in an airgapped browser sandbox.

ENCODED JWT TOKEN [HEADER.PAYLOAD.SIGNATURE] ● READY
TOKEN LIFECYCLE & EXPIRATION TELEMETRY
[STANDBY]
[EXP] EXPIRATION DATE:
--
--
[IAT] ISSUED AT:
--
--
[NBF] NOT BEFORE:
--
--
HEADER [ALGORITHM & TOKEN TYPE] 
{}
SIGNATURE [DIGITAL CIPHER]
--
PAYLOAD [DECODED CLAIMS & ENTITY DATA] 
{}

JSON Web Token (JWT) Zero-Upload Security Specification

RFC 7519 compliant client-side JWT parser designed for authentication telemetry, session debugging, and claim auditing.

01 / LOCAL BASE64URL DECODING

Your auth tokens, user identifiers, and private API claims are decoded in-memory using standard Base64URL decoding. Tokens are never transmitted to any third-party server.

02 / AUTOMATIC TIME RESOLUTION

Converts standard UNIX timestamps (`exp`, `iat`, `nbf`) into local timezone strings with real-time countdown alerts for instant session validity checks.

03 / STRUCTURAL VALIDATION

Validates tripartite token architecture (`header.payload.signature`) with real-time syntax checking and actionable error reporting on corrupted tokens.

FREQUENTLY ASKED QUESTIONS

Q: Does this tool verify the cryptographic signature?
This client-side tool inspects the token structure and checks expiration times. Verifying HMAC or RSA signatures requires your private server key or public certificate, which should never be exposed in a client browser.

Q: Is it safe to paste production bearer tokens?
Yes. This utility runs 100% in your local browser sandbox on Cloudflare Pages static edge hosting. No tokens are logged, stored, or sent across the network.