→JSON-string

according to Wikipedia (https://en.wikipedia.org/wiki/JSON): In computing, JavaScript Object Notation or JSON is an open-standard file format that uses human-readable text to transmit data objects consisting of attribute–value pairs and array data types (or any other serializable value). It is a very common data format used for asynchronous browser–server communication, including as a replacement for XML in some AJAX-style systems. ...

See http://json.org/index.html for an introduction into JSON.