Decode JSON Web Tokens, check expiry and verify HS256 signatures.
When working with modern web applications, APIs, and microservices, JSON Web Tokens (JWTs) are everywhere. Whether you are implementing authentication, managing user sessions, or securing data exchange, you often need to inspect the contents of a token. Our online jwt decoder is a lightweight, fast, and secure tool designed to help developers instantly parse and read the internal data of any token without leaving the browser.
Because security and privacy are paramount when handling authentication credentials, Potato PDF processes your data client-side. Your sensitive tokens are never uploaded or stored on any external server, ensuring complete confidentiality during your debugging sessions.
A JSON Web Token consists of three distinct parts separated by periods: the Header, the Payload, and the Signature. While they are base64Url encoded for safe transmission, they are not encrypted by default. This means anyone can read the contents if they know how to decode the encoding scheme.
Using a reliable jwt decoder saves you from running manual command-line scripts or writing custom parsing functions every time you need to check an expiration time (exp), user ID, or assigned roles. It provides an immediate, human-readable breakdown of the token structure so you can verify claims, troubleshoot login issues, and inspect metadata in seconds.
Inspecting your authentication tokens takes just a few seconds with our streamlined interface:
Yes. All decoding processes happen entirely within your browser using client-side scripts. Your tokens are never transmitted to our servers.
This utility focuses primarily on decoding and inspecting the header and payload claims for debugging purposes. It does not perform cryptographic signature verification against a secret or public key.
Yes, all tools on Potato PDF, including our developer utilities, image converters, and document editors, are 100% free with no registration or hidden fees required.