Splunkd Error in certificate validation

Hello Team, We are developing our own web portal where we need few data from splunk to be displayed on that web portal. So we have downloaded Splunk JS Stack from splunk website. We are able to successfully connected to the splunk instance using 8089 port and we are getting the data but we are getting SSL certificate validation error. Can you please help us here. We would like to solve it from SplunkJSStack. Thanks in advance.