Is there limits to the size of JSON POST Request?

I sent some JSON Data for POST Request but it lead to error response:

My Data had 677 features in area and 678 priorities:

I’m not sure if the request data was too large. If I get the error “Unable to process JSON” what could be cause of this? was the format incorrect?

Are you using a custom model for the Routing API?

If the custom model is too large a different error message should come back. This looks like an incorrect format.

But in general it is better if you simplify your areas (e.g. use less 1e-5 precision or less for the coordinates) and only use areas that you actually need for this request.