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To get a file’s information, not it’s content, call the GET /files/:id API with the id of the file. 
curl -i -X GET "https://api.box.com/2.0/files/12345" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

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File ID

The id for any file can be determined by visiting a file in the web application and copying the id from the URL. For example, for the URL https://*.app.box.com/file/123 the file_id is 123.

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Additional fields

To get more of the fields for a file, make sure to pass along the fields query parameter.

Learn about requesting extra fields