To receive JSON replies from Sharepoint via the REST API, instead of XML replies the http headers need more than you use today:
Accept: text/json, text/x-json, application/vnd.atl.plugins.plugin+json, application/json
Please, can you extend the headers with "application/json;odata=verbose" to make the REST API of sharepoint answering JSON?
Would be great as the json-table would support sharepoint lists.
CF 6.7.2 / SP2013