02-04-2026 00:44
02-04-2026 00:44
We have recently received Daily Activity Summary's activities.calories is returning a string ("-23") instead of -23, eg:
{
...
"activities" : [{
...
"calories": "-23"
}],
}This behavior does not align with what was defined in the documentation (https://dev.fitbit.com/build/reference/web-api/activity/get-daily-activity-summary/) where calories is expected to be of Number type.
Is this an intentional change or a bug? Thanks.
02-09-2026 17:33
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
02-09-2026 17:33
Hi @hi_SG
Thank you for submitting your question.
We will attempt to replicate the issue on our end. We’ll provide an update as soon as we can.
Best Answer02-19-2026 12:26 - edited 02-19-2026 12:26
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
02-19-2026 12:26 - edited 02-19-2026 12:26
Hi @hi_SG
We attempted to replicate the behavior in our environment but have not been able to reproduce the error. To help us investigate why you're seeing a string instead of a number, could you provide a few more details?
What is the exact Endpoint URL and date you are requesting? Is this happening for a specific day's summary, or is it occurring across all historical dates?
Was the activity resulting in '-23' calories synced from a 3rd party app or manually logged?
Could you provide the full JSON response?
Best Answer02-22-2026 20:04
02-22-2026 20:04
Hi @DorisFitbit,
1. Endpoint: .../1/user/${fitbitID}/activities/date/${date}.json, we were only able to identify for 29th Jan, but this occurred for multiple users, we are unsure if it occurred for other users on other days due to not having full access to the data. A similar issue has occurred before but there was no resolution: https://community.fitbit.com/t5/Web-API-Development/Daily-activity-summary-activeScore-returning-quo...
2. the activity resulted in "-23" calories was retrieved directly from Fitbit's endpoint, we do not do any additional manipulation to the data
3. Attached is a screenshot the full JSON response for a sample user
Thank you!
Best Answer03-04-2026 17:11
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
03-04-2026 17:11
Hi @hi_SG
Thank you for sharing!
We will investigate the issue and get back to you as soon as we have an update.
Best Answer03-05-2026 14:12
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
03-05-2026 14:12
Hi @hi_SG
We need more details from you. For privacy reason, I will send you an email so we can move this discussion to the Issue Tracker.
Best Answer