JWT Decoder Guide

Learn how to decode and understand JSON Web Tokens.

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. JWTs are commonly used for authentication and information exchange in web applications.

JWT Structure

A JWT consists of three parts separated by dots (.)

Header

Contains the token type (JWT) and signing algorithm (e.g., HS256, RS256).

Payload

Contains claims - statements about the user and additional metadata.

Signature

Used to verify the token wasn't altered. Created using the header, payload, and a secret.

How to Use This Tool

  1. Paste your JWT token in the input area
  2. The header and payload will be decoded automatically
  3. View the decoded JSON in a formatted, readable format
  4. Copy individual parts or clear to start over