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 Time Series
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Heart Rate Time Series

The Heart Rate Time Series endpoints are used for querying the user's heart rate data. The Heart Rate Time Series endpoints support returning Intraday data (see Intraday).

The endpoints available in this section are