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I am trying to build a code that download all files from the provided end points. However, I do not want to download the files everytime and will only download the files if the data in the endpoints is changed/added. I assume that this is provided by the "last_updated" field in the JSON as shown in the API reference JSON snippet - https://open.fda.gov/api/reference/. What is the URL that provides me similar JSON output?

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The endpoint for downloads is: https://api.fda.gov/download.json

I would log a bug on https://github.com/FDA/open.fda.gov letting them know that the above endpoint should be documented.

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Confusing indeed -- the site doesn't appear to provide a query URL to get the provided JSON output, as you noticed.

For now, it seems like your best bet might be paginating through AWS S3 directory listings available at http://download.open.fda.gov/ and looking at each <Content>'s <Key> and <LastModified> timestamp.

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