Version 4 JSONToolsExtension is now available, complete with updated documentation and examples!
Version 4 brings more stability to the extension with checking for null values to prevent runtime errors in JSON that uses null values. Version 4 also fixes GetStringInArrayByIndex to use non-zero indexes.
You can find the extension, updated documentation, and sample project here: http://thunkableblocks.blogspot.com/2017/07/jsontools-extension.html