Go to JSONify It
For those who have some experience in creating visualizations, particularly online visualizations using JavaScript and libraries such as D3.js, one thing that you will often come across is the need to convert your data. Typically this need will arise because the data you receive or collect will be in a human-friendly format such as an Excel spreadsheet, and in order for you to use it for the visualization you will need that data in JSON format. Annoyingly, this will often be just a one time conversion, meaning writing a stand alone script to do the conversion often seems like overkill.
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