Authenticate to Box with a Service Account and create a new App User

app.js

'use strict';
let BoxService = require('./boxClientService');
let Box = require('box-node-sdk');
const fs = require('fs');
let configFile = fs.readFileSync('config.json');
configFile = JSON.parse(configFile);
let BoxInstance = Box.getPreconfiguredInstance(configFile);
let serviceAccount = BoxInstance.getAppAuthClient('enterprise');
serviceAccount.enterprise.addAppUser('test appuser', null, function (err, user) {
    if (err) {
        console.log(err);
        return;
    }
    console.log(user);
});