Cooperation between Box and DataSpider

I wanted to connect Box and DataSpider (currently mitocoX), so I created a custom app from the development console, downloaded a JSON file, and tried to set it in DataSpider.
However, I get an error and can’t connect.
If you are an expert, please tell me if I should use a file other than a JSON file, and if so, where can I download a file other than a JSON file?
I’m a newcomer, so there are a lot of things I don’t understand, but , thank you.