Overview
Fitbit API gives you access to health and fitness data collected by Fitbit devices, including steps, heart rate, sleep, and activity logs. It uses OAuth 2.0, so users must authorize your app before you can read their data. It is great for building personal health dashboards or wellness apps.
Beginner Tip
Use the special user ID "-" as a shortcut for the currently authenticated user so you do not need to look up their Fitbit user ID separately.
Available Data
Example Response
{
"match_id": 4521,
"home_team": "Team A",
"away_team": "Team B",
"score": {
"home": 2,
"away": 1
},
"status": "Full Time",
"date": "2025-01-15",
"league": "Premier League"
} Field Reference
activities-steps List of daily step count entries for the requested date range dateTime Date of the measurement in YYYY-MM-DD format value Number of steps recorded for that day (returned as a string) summary.steps Total steps for the day when querying a single-day endpoint summary.caloriesOut Total calories burned during the day Implementation Example
const url = "https://dev.fitbit.com/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
headers: {
"Authorization": "Bearer YOUR_API_KEY"
}
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Partially tested on Apr 5, 2026
Technical Specifications
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