How can I have clients edit structured JSON for data collaboration?

I regularly build apps that have semi-static data sets that I define with JSON objects.

Usually the client will send me something like a spreadsheet or doc and I’ll translate it into a JSON object to feed into an app.

The client will often then need to update the data. Instead of:

A) Having them send me another spreadsheet that I need to convert again then merge with the app data

B) Give them access to the app data directly

I’d love some sort of collaborative JSON editing interface that we could work on, where the schema of the object is fixed so that they can’t mess it up.

Does anyone know of something like this?