I was editing some daashboard JSON this week, and must of used the incorrect syntax for one of the new Bindings 2.0. I was then met with an issue where I couldnt access my dashboard JSON.
I was met with no errors or anything... and I couldnt access my code to fix the binding issue.
I spoke to Geoff Rothman who mentioned that there is a URL trick to get access back to the JSON. Shown in the GIF below.. you can remove the /edit from the dashboard URL and replace with /json