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JWT Inspector Dashboard — Token Decoder & Claim Analyzer
A developer utility dashboard for decoding, inspecting, and validating JSON Web Tokens (JWT).
A developer utility dashboard for decoding, inspecting, and validating JSON Web Tokens (JWT). Decodes header, payload, and signature segments, validates structure, analyzes claims, ticks down live token expiration, verifies HMAC signatures, and stores inspection history in localStorage.
- Instant split and Base64URL safe decoding of Header, Payload, and Signature segments
- Live ticking countdown timer with active/expired badges and time-since-expiration display
- Key claims extraction and formatting for Issuer (iss), Subject (sub), Audience (aud), Issued At (iat), and Expiration (exp)
- Client-side HMAC signature verification (HS256/384/512) powered by browser Web Crypto API
- One-click payload copying with toast notification, sample presets, and localStorage inspection history
Built with: JWT Decoder, Base64URL Safe Engine, Web Crypto API, Live Countdown Timer, Vanilla JavaScript, localStorage, CSS Grid / Flexbox, Google Fonts (Sora, Outfit, Chivo Mono)