How do I get data from a website (browser console logs) to Splunk using the JavaScript SDK?

Hi, How do I get data from a website about errors, debug logs (console.log) to Splunk? I have used the Javascript SDK and the issue is with how the credentials need to be passed. It's like posting my Splunk credentials so openly. Is there a way for me to get the data from website to an on-premises Splunk (Like Splunk MINT for mobile devices)? Thanks, Arun