Respond to client

String returns the ID as a string for logging/display

* Get an item from localStorage. Returns null if expired or not found. * @param {string} key - Key to retrieve * @returns {*|null} - Stored value or

Update entry in User map

toJSON converts the request to a JSON string

executeRequest is a helper that sends a JSON-RPC request and returns the parsed response

newRequest creates a new request builder with string or numeric ID

compareJSON compares two JSON objects and returns a human-readable diff