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/ JWT Decoder

JWT Token

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JWT Decoder

Decode and inspect JSON Web Tokens (JWT) to view header, payload, and signature

■ 01

What is a JWT?

JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts: Header, Payload, and Signature, separated by dots (.).

■ 02

How does it work?

JWT Structure Header: Contains the token type (JWT) and the signing algorithm (e.g., HS256, RS256) Payload: Contains the claims - statements about an entity and additional data Signature: Used to verify the token hasn't…

■ 03

Sample Case

Covers Example JWT structure so you can compare common inputs and outputs quickly.

/ Code

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/ Integration

Source code from the selected tool, shown here alongside the live version on the right.

/ Source Code

TypeScript

typescript

type DecodedJWT = {
  header: any;
  payload: any;
  signature: string;
};

// Decode base64url (JWT uses a URL-safe variant of base64)
function base64UrlDecode(str: string): string {
  // Replace URL-safe characters
  let base64 = str.replace(/-/g, '+').replace(/_/g, '/');