There is an Object Array. How to convert it to Json Array? 
ie, the output should be
ROW_DATA = [{ "autor": "", "autorznak": "A22", .... }, { "autor": "", "autorznak": "A22", .... }] Source: https://ru.stackoverflow.com/questions/648266/
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ROW_DATA = obj.books- GrundyROW_DATA = JSON.stringify(obj.books);- Igor