It's an attempt to emulate a JavaScript object within the limits of VBA syntax. It's fully recursive, so you can have endless parents and children depth, can handle arrays, and knows how to Parse JSON, and how to create it. I use it in almost everything I do in VBA - The great thing for me is to be able to 'create classes on the fly' with dynamic properties, which is exactly what we need to be able to parameterize VBA applications. 

As a reminder here's a cJobject slide primer

Javascript like objects and JSON processing in VBA from Bruce McPherson

Here's how it looks against the equivalent JavaScript using a few common things you need to do. Since we are creating classes on the fly at run time, the syntax of VBA makes it a little more wordy, but it achieves approximately the same thing. There are a few useful things exposed also that don't exist in javaScript

what	vba	JavaScript
Create an object from a JSON string	set job = JSONParse(jsonString)	var job = JSON.parse(jsonString);
Create a JSON string from an object	JSONStringify (job) or job.stringify()	JSON.stringify(jsonString);
Create a new object (using Nothing as the argument makes this the root)	set job = new cJobject job.init (Nothing)	var job = {};
Access the key of an object (for example the word 'name' of the object job.name)	s = job.key	n/a
Access the full key of an object (for example the word 'boss.name' of the object job.boss.name)	s = job.fullKey	n/a
Access the child of an object	set j = job.child("name")	j = job.name;
Access the value of a child	v = job.child("age").value	v = job.age;
Access the string value of a child	v = job.child("age").toString	v = job.age.toString();
Access the value of an object	v = j.value	v = j
Access multiple values deep	v = job.child("name.first").value or v = job.child("name").child("first").value	v=job.name.first
Iterate through the children of an object	for each j in job.children	for (var k in job)
Find out how many children an object has	n = job.children.count	var n = 0; for (var k in job) { n++ ;}
Find the parent object	set j = job.parent	n/a
Find an object with a particular  key somewhere in a branch	set j = job.find ("child.first")	n/a
Add a new object as a child	job .add "someKey"	job.someKey = {};
Add a new object and give it a value	job.add "someNumber","someValue"	job.someNumber = someValue;
Set an object to a value	j.value = 100	j = 100;
Add an array	job.add("someArray").addArray	job.someArray = [];
Add a new member value to an array	job.child("someArray").add(,200)	job.someArray.push(200);
Add a new object to an array	job.child("someArray").add("newObject")	job.someArray.push({someObject:null});
iterate through an array	for each j in a.children	for (var i=0; i <a.length;i++) { a[i];}
check if an object exists	if not job.childExists("someKey") is nothing	if (job.hasOwnProperty("someKey"))
check to see if im part of an array	if job.isArrayMember	n/a
find the topmost object of this tree	set root = job.root	n/a
Access my index number in an array	n = job.childIndex	n/a
Access the 1st element of an array	a.children(1)	a[0]
The length of an array	a.children.count	a.length
check to see if im an array	if a.isArrayRoot	if (Array.isArray(a))