Modernizing the Fitbit Developer Experience.
The Fitbit Web APIs are moving to a new, scalable infrastructure. We will be deprecating the legacy Fitbit Web API in September 2026. To ensure uninterrupted data continuity for your users, you will need to migrate your applications. Detailed migration guides are live on the Google Health API developer site.
Heart Rate Variability
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Heart Rate Variability

The Heart Rate Variability (HRV) endpoints are used for querying the user’s heart rate variability data.

Developers can request the following API endpoints when integrating the HRV data type:

If your application has been granted intraday access, the following endpoints can be used. See Intraday.