What it does?

{
	"a": "b"
}

URL Friendly Format-> https://someexample.com/object?a=b

{
	"a": {
		"b" : "c"
	}
}

URL Friendly Format-> https://example.com/object?a[b]=c

{
	"a": {
		"b" :  {
				"c" : "d"
			}
		}
}

URL Friendly Format-> https://example.com/object?a[b][c]=d