ActiveReportsJS has the ability to convert existing .rdlx reports (ActiveReports Professional reports) and convert it to a .rdlx-json report.
Steps to Complete:
1. Open the .rdlx report in the ActiveReportsJS Designer
2. Save the report with .rdlx-json file extension
Note: Only .rdlx reports bound to JSON and CSV data sources are converted to .rdlx-json format, provided the data file is located in the same folder as the .rdlx report.