My node js server is hosted on aws. I need to make a post API call to ec2-18-219-87-48.us-east-2.compute.amazonaws.com:3000/loadFile
You can execute a POST request with webix.ajax() method:
webix.ajax().post(url).then(function(){ .. get response ..});
https://docs.webix.com/helpers__ajax_operations.html#sendingdata