The API (Application Programming Interface) is the way an application can enter in dialogue with Open Food Facts application server.
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It can be used to retrieve data (search), read or write information (see disclaimer, in production, this should correspond to a user scan).
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⚠ '''Disclaimer''':
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If you are not in a production scenario, think about using the pre-production instance at https://world.openfoodfacts.net.
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If you want to use data from open food facts for research, for heavy duty, or to get performance insurance, you may duplicate the database: see https://world.openfoodfacts.org/data