I want to check the data come into piwebapi using Rest, is there any way log the incomming data in piwebapi Rest POST request
Logs are written to the Event Viewer: PIWebAPI
Here is a general list of what is stored in each log file, do not rely solely on checking one log file however.
If you need further debugging you can open %pihome64%WebAPI\OSIsoft.REST.Host.exe.xml and uncomment the following lines. This will generate a PIWebAPI.log file.
Retrieving data ...