Is it safe to paste private authentication tokens into this JWT decoder?

Yes. Zapixal processes all JWT tokens completely client-side in your browser memory sandbox. No token, header, payload, or secret key is ever transmitted over the network or saved to remote logs.

How does the JWT expiration countdown work?

The decoder reads the standard "exp" (expiration timestamp), "iat" (issued at), and "nbf" (not before) claims from the payload, converts the Unix epochs into local and UTC date strings, and computes the exact remaining lifetime or time elapsed since token expiry.

Can I verify HMAC signatures (HS256, HS384, HS512) locally?

Yes. The built-in signature verification engine uses the browser native Web Crypto API (SubtleCrypto) to calculate the HMAC digest against your secret key locally in browser memory without sending your secret anywhere.

What is the difference between JWT and JWE tokens?

A standard JWT (JWS) consists of 3 dot-separated Base64URL segments (Header, Payload, and Signature) where the payload is encoded and readable. A JWE (JSON Web Encryption) consists of 5 segments where the payload is cryptographically encrypted and requires a private decryption key.

JavaScript is Required

Zapixal is a client-side application. It requires JavaScript to process images securely in your browser without uploading them to a server. Please enable JavaScript to use this tool.

Client-Side

JWT Debugger & Decoder

Name: Zapixal - JWT Debugger & Decoder
Availability: InStock
Author: Zapixal

Decode, inspect, and verify JSON Web Tokens (JWT) in browser memory. View claims, expiration timers, and verify HMAC signatures with zero server uploads.

Developer Suite5 Tools

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