There's a new version of the HubSpot API

Starting November 30, 2022, API keys will be sunset as an authentication method. Learn more about this change and how to migrate an API key integration to use a private app instead.

Do HubSpot APIs support CORS / AJAX requests?

For the most part, the HubSpot APIs do not support cross-origin (CORS) AJAX requests. Making the request client-side using JavaScript would expose any authentication you're using for the request. In order to use JavaScript/AJAX, you would need to make the request (excluding any authentication) to an external server that could then add the needed authentication and make requests to HubSpot's APIs server-side.

The exceptions to this rule are: