const { SiteClient } = require('datocms-client');
async function run() {
  const client = new SiteClient('YOUR-API-TOKEN');
  
  const itemTypes = await client.itemTypes.all();
    
    itemTypes.forEach((itemType) => {
      console.log(itemType);
    });
}
run();

> node example.js
{
  "id": "44",
  "name": "Blog post",
  "apiKey": "post",
  "collectionAppearance": "compact",
  "singleton": false,
  "allLocalesRequired": false,
  "sortable": true,
  "modularBlock": false,
  "draftModeActive": false,
  "tree": false,
  "orderingDirection": null,
  "orderingMeta": "created_at",
  "hasSingletonItem": false,
  "hint": "Blog posts will be shown in our website under the Blog section",
  "singletonItem": null,
  "fields": [
    "124"
  ],
  "titleField": null,
  "imagePreviewField": null,
  "excerptField": null,
  "orderingField": null,
  "workflow": null
}