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API developer guides & resources

HubSpot's APIs, which you can find the reference documentation here, allow you to build a functional app or integration quickly and easily. Here's an overview of what you'll need to use them.

Building apps

Before HubSpot users can start installing your app, you'll need to get set up in your developer account. From there, you can create an app, configure OAuth, and create a test environment. Start building now.


Most HubSpot API endpoints support both OAuth and API keys.

Please note: starting November 30, 2022, HubSpot API keys will no longer be able to be used as an authentication method to access HubSpot APIs. In addition, starting July 15, 2022, accounts without a HubSpot API key already generated will no longer be able to create one.

Instead, you'll need to use a private app access token or OAuth to authenticate API calls. Learn more about this change and how to migrate an API key integration to use a private app instead.

  • If you want to list your app in the HubSpot App Marketplace or have multiple users install it, you must use OAuth.
  • If you're building a private app, you can make calls using your app's access token, which also implements OAuth.

Usage and limits

Learn about our usage guidelines, rate limits, and how to check your API call usage.

App Partners and the App Marketplace

Review app listing requirements and create your app listing.

Learn to use APIs and build apps on HubSpot Academy

Learn more about the HubSpot APIs, developer accounts, and how to start making calls using both OAuth and API keys with these short (and free!) HubSpot Academy videos.


Quick links

Related docs

API reference docs