const SiteClient = require('datocms-client').SiteClient;
const client = new SiteClient('YOUR-API-TOKEN');
client.site.update({
  noIndex: true,
  favicon: '123',
  globalSeo: {
    siteName: 'My Awesome Website',
    fallbackSeo: {
      title: 'Default meta title',
      description: 'Default meta description',
      image: '123',
      twitterCard: 'summary_large_image'
    },
    titleSuffix: ' - My Awesome Website',
    facebookPageUrl: 'http://facebook.com/awesomewebsite',
    twitterAccount: '@awesomewebsite'
  },
  name: 'My Awesome Website',
  theme: {
    primaryColor: {
      red: 128,
      green: 128,
      blue: 128,
      alpha: 128
    },
    lightColor: {
      red: 128,
      green: 128,
      blue: 128,
      alpha: 128
    },
    accentColor: {
      red: 128,
      green: 128,
      blue: 128,
      alpha: 128
    },
    darkColor: {
      red: 128,
      green: 128,
      blue: 128,
      alpha: 128
    },
    logo: '123'
  },
  locales: [
    'en'
  ],
  timezone: 'Europe/London',
  require2fa: false,
  ipTrackingEnabled: true,
  ssoDefaultRole: '34'
})
.then((site) => {
  console.log(site);
})
.catch((error) => {
  console.error(error);
});

> node example.js
{
  "id": "155",
  "name": "My Awesome Website",
  "domain": "admin.my-awesome-website.com",
  "googleMapsApiToken": "xxxxxxxxxxxxx",
  "imgixHost": "www.datocms-assets.com",
  "internalDomain": "my-website.admin.datocms.com",
  "locales": [
    "en"
  ],
  "timezone": "Europe/London",
  "noIndex": true,
  "favicon": "123",
  "lastDataChangeAt": "2017-03-30T09:29:14.872Z",
  "frontendUrl": "https://www.mywebsite.com/",
  "require2fa": false,
  "ipTrackingEnabled": true,
  "theme": {
    "primaryColor": {
      "red": 128,
      "green": 128,
      "blue": 128,
      "alpha": 128
    },
    "lightColor": {
      "red": 128,
      "green": 128,
      "blue": 128,
      "alpha": 128
    },
    "accentColor": {
      "red": 128,
      "green": 128,
      "blue": 128,
      "alpha": 128
    },
    "darkColor": {
      "red": 128,
      "green": 128,
      "blue": 128,
      "alpha": 128
    },
    "logo": "123"
  },
  "globalSeo": {
    "siteName": "My Awesome Website",
    "fallbackSeo": {
      "title": "Default meta title",
      "description": "Default meta description",
      "image": "123",
      "twitterCard": "summary_large_image"
    },
    "titleSuffix": " - My Awesome Website",
    "facebookPageUrl": "http://facebook.com/awesomewebsite",
    "twitterAccount": "@awesomewebsite"
  },
  "account": "312",
  "buildTriggers": [
    "1822"
  ],
  "menuItems": [
    "34"
  ],
  "ssoUsers": [
    "312"
  ],
  "users": [
    "312"
  ],
  "itemTypes": [
    "44"
  ],
  "ssoDefaultRole": [
    "34"
  ],
  "roles": [
    "34"
  ]
}