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JWT Decoder
Inspect, decode, and validate JSON Web Tokens (JWT) locally. Your tokens are processed entirely in-browser and never sent to any server.
JWT Token Input
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Frequently Asked Questions
Everything you need to know about processing files securely in your browser
What is a JSON Web Token (JWT)?
A JSON Web Token (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. It consists of three parts separated by dots: Header, Payload, and Signature.
Is it safe to paste my JWT tokens into this decoder?
Yes, it is completely safe. Unlike other web-based decoders, this JWT decoder parses and decodes the token entirely in your browser using local JavaScript. Your token and its sensitive payload claims are never sent to any server.
Can this tool verify the signature of my JWT?
This tool is a local decoder that inspects the JSON payload and header claims. It does not perform cryptographic signature validation, which typically requires sharing public/private keys or querying server-side authentication providers.
How can I read the expiration date (exp) of a JWT?
The payload of a JWT often contains an exp claim, which is a Unix timestamp. This tool automatically translates that timestamp into a human-readable local date and time and highlights if the token is expired.