The easiest way to debug Web SDK based applications is to use the Chrome Developer Tools. Use the Console tab to explore objects as shown in the screenshot below.
Underlying the Web SDK an application programming interface (API) is used. To see the information sent across the network, click on the Network tab within the Developer Tools. A network activity timeline appears. Underneath that, under the Name heading, you can click on an API interaction and see the content sent and the response. The screenshot below shows the response from a Verify Document API response.
JSON format content can be copied from the Network view and then pasted into online JSON Pretty Print tools in order to make it more readable.