Security & Authentication100% Client-Side (No server logs)

JWT Debugger & Decoder

Inspect JSON Web Tokens in real time. Decode header algorithms, inspect payload claims, and verify expiry dates locally.

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Test with Samples:

Active & Valid720h 0m remaining

Expires on: Mon, 18 May 2026 13:20:00 GMT (Mon, 18 May 2026 13:20:00 GMT)

Issued At (iat):

Sat, 18 Apr 2026 12:20:00 GMT

Encoded JWT Token

Header Payload Signature

HEADER: Algorithm & Token Type

{
  "alg": "HS256",
  "typ": "JWT"
}

PAYLOAD: Data Claims & Expiry

{
  "sub": "usr_8492049102",
  "name": "Al Amin",
  "email": "developer@merxodevsolutions.pro.bd",
  "role": "super_admin",
  "iss": "https://auth.merxodevsolutions.pro.bd",
  "aud": "merxodev-api-gateway",
  "iat": 1776514800,
  "nbf": 1776514800,
  "exp": 1779110400
}

Cryptographic Signature Verified Locally

Decoded without secret verification. To verify authenticity, your backend validates the signature using your private key or secret.

Signature: c4dE_39FkL78w0_sample_signature_abc123

Zero Server Transmission

Unlike many online tools that send your authorization tokens to remote servers, this tool executes strictly in your browser using standard Base64Url decoders.

Automatic Time Parsing

Unix timestamps like exp and iat are automatically translated into human-readable local time and UTC with active countdowns.

RFC 7519 Standards

Full compliance with JSON Web Token specifications, ensuring reliable decoding for Auth0, Supabase, NextAuth, Firebase, and custom JWT servers.