short for JavaScript Object Notation is a popular data exchange format
It was derived from the JavaScript scripting language for representing simple data structures and associative arrays, called objects. Despite its relationship to JavaScript, it is language independent, with parsers available for many languages.
Backup brought us here
> An export.json file can be constructed from pages backed up with rsync using the jq utility.
STON
JSON seems to have hit a sweet spot: it is very simple, yet just powerful enough to represent some of the most common data structures across many different languages. JSON is very readable and relatively easy to type. However, JSON knows only about lists and maps. There is no concept of object types or classes. This means that it is not easy to encode arbitrary objects, and some of the possible solutions are quite verbose (Encoding the type or class as a property and/or adding an indirection to encode the object's contents). -- Smalltalk Object Notation (STON)
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In computing, __JavaScript Object Notation__ (__JSON__) is an open standard file format that uses Human-readable medium text to transmit data objects consisting of attribute–value pairs and array data types (or any other Serialization value). It is a very common data format used for Asynchronous I/O browser–server communication, including as a replacement for XML in some Ajax (programming)-style systems - wikipedia 
NeoJSON
NeoJSON is an elegant and efficient standalone Smalltalk library to read and write JSON converting to and from Smalltalk objects. The library is developed and actively maintained by Sven Van Caekenberghe.