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Converting from JavaScript Object Notation (JSON) to Comma-Separated Values (CSV) is a common need in daily workflows. subscribe(function(jsonObj){ //single json object will be emitted for each csv line // parse each json asynchronousely return new Promise(function(resolve,reject){ All the drug details in DrugBank in CSV format The fastest way to scrape a modern web app into CSV or JSON is to use a web extraction API that handles JavaScript rendering and parallel extraction. 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