{
  "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/spfx-serve.schema.json",
  "port": 4321,
  "https": true,
  "initialPage": "https://enter-your-SharePoint-site/_layouts/workbench.aspx",
  "serveConfigurations": {
    "default": {
      "pageUrl": "https://contoso.sharepoint.com/sites/mySite/SitePages/myPage.aspx",
      "customActions": {
        "8e99be83-ad7e-4706-a8e1-d72df435d7e9": {
          "location": "ClientSideExtension.ListViewCommandSet.CommandBar",
          "properties": {
          }
        }
      }
    },
    "extension": {
      "pageUrl": "https://contoso.sharepoint.com/sites/mySite/Shared Documents",
      "customActions": {
        "8e99be83-ad7e-4706-a8e1-d72df435d7e9": {
          "location": "ClientSideExtension.ListViewCommandSet.CommandBar",
          "properties": {
          }
        }
      }
    }
  }
}