Another option is the TrelloExport Chrome extension: https://chrome.google.com/webstore/detail/export-for-trello/nhdelomnagopgaealggpgojkhcafhnin?hl=en-US
You may run into a situation where you need to use Trello’s JSON export to locate a piece of information. To do this, we suggest reaching out to a developer—JSON, particularly when it’s covering a whole board, can be complicated to parse out correctly. If a developer isn’t available, you may want to try using an online JSON-to-CSV converter, such as:

https://json-csv.com/

http://konklone.io/json/

http://jsonformatter.curiousconcept.com/

http://www.json-xls.com (This converts to XLS, not CSV)

via Making sense of Trello’s JSON export – Trello Help

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