Apart from designing reports, the ActiveReportsJS Designer can be used to import an existing .rdlx report (report type for ActiveReports .NET) and convert it to a .rdlx-json report. This saves the time and effort of a developer to manually replicate the layout in ActiveReportsJS. See this topic on designing reports with ActiveReportsJS Designer.
Follow these simple steps to migrate .rdlx report to .rdlx-json report:
Note: Only reports bound to JSON and CSV data source are converted to .rdlx-json format, provided the data file is located in the same folder as report.