Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used to securely transmit information between parties. A JWT consists of three Base64URL-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims such as user ID and expiry), and the Signature (used to verify the token's authenticity).
Is it safe to decode a JWT online?
NexKit's JWT decoder runs entirely in your browser — no token data is sent to any server. Decoding (reading the header and payload) is safe because the data is only Base64URL-encoded, not encrypted. However, you should never share your JWT with untrusted third-party tools, as anyone with your token can use it until it expires.