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Fitbit Companion REST API - Developers

The Companion API provides information about the running companion application, access to permissions, and oAuth access tokens. The Companion provides an additional JavaScript runtime environment that exists within the Fitbit mobile application, to utilize resources and sensors of the mobile device. Fitbit applications are not required to have an associated companion unless you need to perform the following; Communicate with Web APIs, Download images or other resources from the internet, Utilize the mobile device GPS sensor and Persist data on the mobile device. The Companion APIs are accessible by applications which run within the Fitbit mobile applications only. Fitbit provides connected products that track health and fitness.