JSON Web Token Inspector
Inspect token claims, headers, and signatures with UTF-8 safe Base64Url decoding and live validity badges.
VALID (Expires in 7 yrs)
Encoded JWT String
exp (Expires At)
5/18/33, 3:33 AMExpires in 7 yrs
iat (Issued At)
10/27/24, 3:33 AM2 yrs ago
sub (Subject)usr_0a1b2c3d4e
iss (Issuer)https://auth.gigachad.dev
Header: Algorithm & Type
{
"alg": "HS256",
"typ": "JWT",
"kid": "pub-key-02"
}Payload: Data & Claims
{
"sub": "usr_0a1b2c3d4e",
"name": "Alex Chad",
"email": "chad@gigachad.dev",
"role": "tech_lead",
"iat": 1730000000,
"nbf": 1730000000,
"exp": 1999999999,
"iss": "https://auth.gigachad.dev",
"aud": "gigachad-api-gateway"
}Signature (Raw):HqZ4e18hW1XkK8mUvJ2d9nC8p7q6fL1sZ8e9a2b3c4d
Token Decoding & Encoding Forensics Reference
How It Works & Key Formulas (Quick Reference)
Technical figures, mathematical formulas, and verified on-chain mechanics.
Yes, all decoding is executed strictly client-side inside the browser using standard Base64URL and UTF-8 Web APIs. No token strings, claims, or signature hashes are ever transmitted across the network, logged to analytics, or written to server databases.
Full-Stack Engineering & AI Systems Consulting
Need a custom full-stack Next.js web app, production AI/RAG search system, or cloud architecture? Work with me.
I engineer high-throughput web applications, vector-based semantic search engines, interactive data visualizations, and production-grade cloud architectures. Whether you need an elite MVP built in weeks, legacy platform refactoring, or enterprise scale, let's build something exceptional.
Next.js 15 & TypeScriptAI RAG & Vector EmbeddingsAWS Cloud & Micro-Frontends