[SSN] JSON Get Key Value

A node that takes a JSON-formatted string (via a pin) and a key, then outputs the value associated with that key. Class methods ------------- INPUT_TYPES (dict): Defines the input fields for this node. In this case, a JSON string (single-line pin) and a key string. Attributes ---------- RETURN_TYPES (`tuple`): The type of the output tuple. Here, it is a single STRING. RETURN_NAMES (`tuple`): Optional: The name of the output ("value"). FUNCTION (`str`): The name of the entry-point method. This node uses "execute". CATEGORY (`str`): The category under which this node appears in the UI ("JSON"). execute(json_string, key) -> tuple: Parses the JSON from the pin and returns the value for the given key as a JSON-formatted string. If the key is not found or parsing fails, returns an empty string.