Garmin API Integration
Start Receiving Data From Garmin In 5 Minutes
Garmin
Enable Garmin through your Terra dashboard
Select a Wearable
Garmin
Connect users to your app
0. "active_durations_data":{...}
1. "calories_data": {...}
2. "device_data": {...}
3. "distance_data": {...}
4. "heart_rate_data": {...}
5. "movement_data": {...}
6. "position_data": {...}
Start receiving data from Garmin on your app or website
How the Garmin API integration works
- Data delivery
- Garmin pushes to Terra on change
- Expected latency
- Seconds after the provider syncs
- Data types
- Activity, Body, Daily and Sleep, normalized by the Terra unified API
- Credentials
- Terra manages the Garmin API credentials, so there is nothing to register
Two ways to receive Garmin data
When data is available from a Garmin device, Terra sends it straight to your webhook. During your Terra account setup you'll be prompted for a callback URL, and that is where Terra POSTs each payload.
Garmin notifies Terra as soon as new data is available, and we POST the normalized payload straight to your webhook. No polling needed.
Garmin's Activity
Payload Preview
Terra API preserves the raw data from the wearable, it just standardizes the units and the json format. It doesn’t augment or change the raw data in any way.
Data is organized into one of 6 data types.
Learn More
Activity Payload (JSON)
{
active_durations_data: { ... }
calories_data: { ... }
data_enrichment: { ... }
distance_data: { ... }
energy_data: { ... }
heart_rate_data: { ... }
metadata: { ... }
movement_data: { ... }
polyline_map_data: { ... }
position_data: { ... }
power_data: { ... }
work_data: { ... }
}
Data can also be sent as a FIT File or with the FHIR Format.
Send Garmin data to your backend
Terra forwards every normalized payload to the destination you already use.
Webhook
Firestore
SQL
Mongo DB
Google Cloud Storage Bucket
AWS S3 Bucket
AWS Simple Queue Service
Kafka
Supabase
Azure BlobPeople Often Ask Us...
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What devices are supported?
Terra API integrates with any Garmin device currently supported by Garmin.
Terra on Garmin
Research and writing from the Terra team on Garmin.
- Blog7 Sep 2026
Garmin's Connect Developer Program is paused: what it means if you're building on wearable data
Garmin paused new Connect Developer Program applications while it updates the program. What the pause covers, why Garmin data matters, how to keep shipping.
Vanessa Neeff
- Blog6 Sep 2026
Terra's Routes API: Get training routes on your user's watch
Design an activity route once, and it lands on your users' watch ready to follow, with none of the usual file wrangling!
Vanessa Neeff
- Research27 Apr 2026
The Data Behind the London Marathon
While Sabastian Sawe was busy breaking the two-hour marathon barrier in London, the watches of 571 amateur runners told a quieter but equally fascinating story. GPS devices over-measured the course by 527 metres on average, faster runners ran with higher heart rates than the slower ones did, and Coros watches reported 47% more calories per kilometre than physiology actually supports.
Alistair Brownlee
- Research9 Apr 2026
How The Fittest Do Winter
We analyzed 856,000 exercise sessions from Europeans across 20 countries to find out how people really train across the year. The data reveals three distinct exerciser phenotypes — and an entire category of athlete that didn't exist a decade ago, invented by indoor cycling platforms like Zwift.
Alistair Brownlee
- Blog1 Jul 2026
June 2026 product update: Graphs, health insights in the dashboard, and a rebuilt Streaming API
June 2026: build a chart in the dashboard and embed it in your product, run health insights over a user's data, and a rebuilt Streaming API with a test mode.
Alex Venetidis
- Blog1 May 2026
April 2026 product update: synthetic users let you build a health app before you have any real users
April 2026: synthetic users generate realistic health data on demand, five new sources join the catalogue, and score history gets its own endpoints.
Alex Venetidis
- Blog1 Mar 2026
February 2026 product update: backfills now arrive newest first, and planned workouts reach Coros and Huawei
February 2026: backfills now deliver faster for improved onboarding experiences, planned workouts now reach Coros and Huawei, and Apple Health symptom tags are launched.
Alex Venetidis
- Research17 Dec 2025
How HRV Actually Works
We unpack what HRV really is and how it actually works to demystify the data from Apple Watch, Fitbit, and Garmin. Some devices deliver stronger signals for daily recovery (RMSSD), tightly linked to resting heart rate, while Apple produced significantly higher variability by measuring broader autonomic balance (SDNN). The results expose a fundamental metric divide: these devices are speaking different mathematical languages, meaning your choice of wearable determines whether you are tracking training readiness or overall stress.
Alistair Brownlee
- Research9 Dec 2025
How Do People Really Use Wearables?
We analyzed 93 days of continuous sleep data across Fitbit, Apple Watch, and Garmin users to answer a simple question: who actually wears their wearable device? While Garmin offers superior data fidelity, our analysis reveals it suffers from the lowest user adherence (69.3%).
Alistair Brownlee
- Research28 Nov 2025
Benchmarking Wearable Sleep Data Reliability
We analyzed sleep data from over 5,000 real-world nights across Apple Watch, Fitbit, and Garmin users. Garmin delivered the longest, most consistent sleep duration with the lowest variability and almost no outliers, while Apple consistently under-reported deep sleep and showed the highest error rates. The results reveal clear winners and losers in wearable sleep-tracking accuracy — and why device choice matters for long-term trends.
Halvard Ramstad
- Blog21 Sep 2022
Garmin HRV Data available from Terra API
Garmin HRV Data Heart Rate Variability (HRV) is a very important measurement for health and recovery. For quite a few years now, Garmin has been providing this in the sen
Elliott Yu
- Blog12 Sep 2022
HRV Comparisons: Eightsleep vs Garmin
HRV Comparison: Eightsleep vs. Garmin TL;DR Eightsleep and Garmin were found to match HRV trends at times, but not consistently enough. Eightsleep is measuring without an
Jacob Bulbul
- Blog19 Aug 2022
Identifying COVID from HRV
Identifying COVID from HRV A few weeks ago, Garmin released their new HRV measurement tool for the Fenix/Epix lines. It measures your HRV during sleep. (You can see some
Kyriakos Eleftheriou
- Blog20 May 2022
Behind the Scenes: The Data Standardisation Process
Behind the Scenes: The Standardisation Process POV: You're trying to integrate with Garmin, Google Fit, Oura, Wahoo and Fitbit for activities data to display your users'
Elliott Yu
Garmin API alternatives
These integrations also offer Activity, Body, Daily and Sleep data.
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