const SiteClient = require('datocms-client').SiteClient;
const client = new SiteClient('YOUR-API-TOKEN');
const userId = '312';
client.user.update(userId, {
  isActive: true,
  role: '34'
})
.then((user) => {
  console.log(user);
})
.catch((error) => {
  console.error(error);
});

> node example.js
{
  "id": "312",
  "email": "mark.smith@example.com",
  "is2faActive": true,
  "fullName": "Mark Smith",
  "isActive": true,
  "meta": {
    "last_access": "2018-03-25T21:50:24.914Z"
  },
  "role": "34"
}