Hi , I am trying to upload a file through Imported data Project using API. Is there any API which I can use. I did see this “Add Records to Imported Data Project API ” but the limitation here is convert the convert the data to Json and also only 50 records at a time.

There is an Load into a Data Project Task through Workflows that should get you pass the 50 record limitation. But you will have to use an SFTP or Google Sheets or another File Extraction option available.