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APIs with volumetric data either require or respond with a sheet structure. A sheet structure mimics an Excel or Google Sheet. This allows API users to send or receive more data in a smaller JSON format. The sheet contains multiple blocks, which organize data either in a table or list format. View an example workbook for TDS Form 140. In the preceding workbook, there are four separate sheets, each containing different types of data. The same data in JSON format would look like this. JSON