hello Ranchers, Is there anyway to grant access to users to specific rancher projects externally using script ?

The Rancher API is not officially supported. However some users use API calls to automate processes. You would need to first get an API key or bearer token from the rancher user settings. Then open the developer tools in the browser, give the user permission in the Rancher UI, and intercept the network traffic to see what the API call is.

thanks @tall-school-18125 I will try it out.