Would this be correct:
Web.config
<appSettings><add key="webpages:Version" value="3.0.0.0"/><add key="webpages:Enabled" value="false"/><add key="PreserveLoginUrl" value="true"/><add key="ClientValidationEnabled4.5.1" value="true"/><add key="UnobtrusiveJavaScriptEnabled" value="true"/></appSettings>
To appsettings.json:
{"AppSettings": {"webpages:Version": "3.0.0.0","webpages:Enabled": "false","PreserveLoginUrl": "true","ClientValidationEnabled4.5.1": "true","UnobtrusiveJavaScriptEnabled": "true" } }