Is it possible to sync google sheets to backendless, I've found zapier as a solution but i am looking for direct integration through google appscript, Is it possible?

I need to sync my google sheets to backendless database, i.e., all my worksheets in my sheet needs to be transferred to respective tables.

If you can make REST API calls in appscript, you can use our API to populate the Backendless database:
https://backendless.com/docs/rest/data_saving_objects_overview.html