Finding my AWS account ID using JavaScript

Question

How do I find my AWS account ID using JavaScript/NodeJS?

Should work when explicitly providing keys for a root-account or IAM user. Should also work when invoked inside of an ec2-instance which is configured with instance-profile (no keys).

Answer 1

The best way is via "Security Token Service":

var AWS = require('aws-sdk');
// Load credentials and set region from JSON file
AWS.config.loadFromPath('./config.json');

var sts = new AWS.STS();
sts.getCallerIdentity({}, function(err, data) {
   if (err) {
      console.log("Error", err);
   } else {
      console.log(JSON.stringify(data.Account));
   }
});

This would print the account ID with a simple call.