const { SiteClient } = require('datocms-client');
async function run() {
  const client = new SiteClient('YOUR-API-TOKEN');
  
  const accessTokenId = '312';
  const accessToken = await client.accessToken.regenerateToken(accessTokenId);
  
  console.log(accessToken);
}
run();

> node example.js
{
  "id": "312",
  "name": "Read-only API token",
  "token": "XXXXXXXXXXXXXXX",
  "canAccessCda": true,
  "canAccessCdaPreview": true,
  "canAccessCma": true,
  "hardcodedType": "",
  "role": "34"
}