JWT Decoder
Decode your JSON Web Tokens securely without sending them to a server.
Decode JSON Web Tokens (JWT) Securely
JSON Web Tokens (JWT) are an open, industry-standard method for representing claims securely between two parties. Our online JWT Decoder allows developers to easily inspect the header and payload of any JWT without compromising security.
Client-Side Security
Security and privacy are critical when handling authentication tokens. Our JSON Web Token inspector operates entirely on the client side. Your tokens are decoded directly in your browser using JavaScript, meaning your sensitive session data, claims, and signatures are never sent to or logged by our servers.
Understanding the JWT Structure
A standard JWT consists of three parts separated by dots: Header, Payload, and Signature. This tool instantly splits the token and decodes the Base64Url encoded Header and Payload sections, transforming them into readable JSON formats so you can easily verify user roles, expiration times (exp), and issuer claims (iss) during development and debugging.