How to access credential using javascript?

[Sev3]

Hi, Guys. I'm new in servicenow workflow and script includes module, I'm doing an api integration wherein I would like to input the credential(api key, username, password) in javascript but I don't want my credential become viewable by other user. I saw a credential module in servicenow. Is it possible to access it in script includes(javascript)? If no, I would like to know if there's an other way to do it.

Thanks in advance!

Sev.

[SanjivMeher]

If it worked kindly mark the response correct and close the thread

[Sev3]

Hello, Sorry for late reply. I try your suggestion Sanjiv this is my code 

var rtn = {};
try{
var r = new sn_ws.RESTMessageV2('ServiceNow Credential','get');
var response = r.execute();
rtn.requestBody = response.getBody();
gs.log(rtn.requestBody,'sevs');
}
catch(ex){
rtn.error = response.getErrorMessage();
gs.log(rtn.error,'sevs');

}

When I check the system log it appears that message "undefined" is there's any thing that i missed? I attached the set up of my created Rest Message

My assumption is since the already set the endpoint and Basic Authentication details I should not set it in my javascript. I'm I correct?

Another question is what if I want to change the endpoint in my Rest message is it acceptable if I will add this code in java script 

r.setEndpoint('https://dev55879.service-now.com/api/now/table/anotherTable');  //for example

Thanks