Free JWT Decoder Guide
July 4, 2026
JWT (JSON Web Token) is the standard for authentication in modern web applications. This guide explains how to decode JWTs and what to look for.
What is a JWT?
A JWT has three parts separated by dots: header.payload.signature. The header contains the algorithm, the payload contains claims (user data, expiry), and the signature verifies authenticity.
How to decode a JWT
- • Open the AHX JWT Decoder (link below)
- • Paste your JWT token
- • The tool decodes header and payload automatically
- • Check expiry: the tool shows if the token is valid or expired
- • Copy header or payload as needed
The tool parses the exp (expiry), iat (issued at), and nbf (not before) claims and displays them as human-readable dates. If the token is expired, it shows a red warning.