JSON null value checker

Description
Given a JSON file as input, identify the keys for which the value is null. If the file contains &gt;1 JSON object, the output should specify which objects contain which keys with null values. Similarly with arrays: output should specify which arrays&#160;contain which keys with null values.&#160;So&#160;probably the output should contain as many fields as there are layers of nesting: objects, arrays, arrays nested in arrays, ..., keys.<div><br/></div><div>Some test data that you might work with are the hub repositories for the Digital Public Library of America: http://dp.la/info/developers/download/</div>
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