JWT Decoder
Paste your JSON Web Token (JWT) to instantly decode its header and payload. Processing happens entirely in your browser.
Frequently Asked Questions
What is a JSON Web Token (JWT)?
JWT is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Are JWT tokens encrypted?
By default, no. Standard JWTs are Base64Url encoded, meaning anyone who intercepts the token can decode and read the payload. They provide integrity (via the signature), not confidentiality.
Is it safe to paste my production token here?
Yes, it is completely safe. The decoding logic is executed using JavaScript running locally within your browser. No server requests are made with your token data.
Why doesn't the tool verify the signature?
Verifying the signature requires the private secret key stored on your backend server. This tool is designed for quick debugging and reading of public claims without asking you to expose your highly sensitive secret keys.
Secure and Private JWT Parsing for Developers
JSON Web Tokens (JWT) represent a compact, URL-safe means of representing claims to be transferred between two parties. Whether you are debugging OAuth2 flows, verifying authorization scopes, or checking the expiration time (exp) of an access token, a reliable decoder is an essential utility for backend and frontend developers alike.
Unlike many online utilities, our JWT parser respects your application’s security boundaries. The Base64Url decoding script runs entirely client-side. This guarantees that your sensitive authentication tokens never leave your local machine, ensuring compliance with strict privacy and security standards.
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