How to fetch JSON of a design file, any direct api for that

How to fetch JSON of a design file, any direct api for that provided by Figma

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Please visit the Figma Developers website for more information.
https://www.figma.com/developers/api

there is any way to get JSON for a frame

Yes you can. Follow the links in my post above to explore all the capabilities of the API.

@tank666 there is any way to get prototype comments

Use the GET comments endpoint.