The USDA FoodData Central API provides access to nutrient data for over 300,000 foods including Foundation Foods, branded products, SR Legacy, and survey foods (FNDDS). Each food record includes macronutrients, micronutrients, serving sizes, and data source information. Rate limited to 1,000 requests per hour with a free data.gov API key. Data is public domain under CC0 license.
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You can search foods by keyword with filters for data type and brand (foods/search), retrieve the full nutrient profile for a specific food by its FDC ID (food/{fdcId}), look up multiple foods at once in a batch request (foods endpoint), and page through the complete food database (foods/list).
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