AWS CredentialProviderChain example in aws-sdk of NodeJS

aws-get-credentials.js

var AWS  = require('aws-sdk');
var chain = new AWS.CredentialProviderChain();
var credentials

AWS.CredentialProviderChain.defaultProviders = [
  function () { return new AWS.EnvironmentCredentials('AWS'); },
  function () { return new AWS.EnvironmentCredentials('AMAZON'); },
  function () { return new AWS.SharedIniFileCredentials({profile: 'my_profile_name'}); },
  function () { return new AWS.EC2MetadataCredentials(); }
]

chain.resolve((err, cred)=>{
	AWS.config.credentials = credentials = cred;
});

AWS.config.update({region: 'us-west-2' });