Free online JWT decoder tool. Decode and inspect JWT tokens to see their payload, claims, and expiration. Supports RS256 and HS256 algorithms.
Frequently Asked Questions
What is a JWT token?
JSON Web Token (JWT) is a compact, URL-safe way to transmit information between parties as a JSON object. It consists of three parts: Header, Payload, and Signature.
Is my data secure?
Yes! All decoding happens locally in your browser. Your JWT tokens are never sent to any server. We cannot see or store your tokens.
What information does the header contain?
The header typically contains the algorithm (like HS256 or RS256) and token type (usually JWT).
What does the payload contain?
The payload (also called claims) contains the data being transmitted, such as user ID, email, roles, expiration time (exp), issued at (iat), and other custom claims.