This tool requires that you have prior knowledge and understanding of JSON data and its structure. If this is something you are unfamiliar with do not worry, you can use any spreadsheet software to fill your CSV file with content. Spreadsheet software I recommend are Calc by Open Office or Google Sheets if you prefer an online solution.
I highly recommend that you download the example files for this tool as they may help give you a better understanding of how it works.
You must first provide a valid JSON feed that allows for CORS within the first input field.
This is the array containing all of the content that you wish to grab. When providing the path of the parent array you must end it with '[*]' as this will tell the tool that this is the array containing all of the content that you wish to grab and associate with the variable/s from your template. An example parent would be: data.children[*]
Within the first input you will provide one of your templates variables and in the second input the JSON path you would like to associate with it. So if you were to have an image variable in your template that you want to have associated with an image URL from the JSON feed you would put something like 'photograph' into the first input and 'data.children[*].data.url' into the second input. If the JSON path that you wish to associate with a variable is within the parent array you must provide '[*]' within the parent part of the path. (Currently online string values can be grabbed).
Once all of the vairable names and values have been assigned you can then click on the cloud icon on the bottom right to grabd and collate the data. To save the collated data as a CSV file you can click on the save button that is also found on the bottom right.
This tool is still a concept so a lot of features and functionality are still in production and will improve over time!