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I feel like this page does a good job of telling me nothing. It's a representation of a graph? Where each node can be a text string or a file or a URL or a container of other nodes? And somehow these links and files and containers have a color? What is the purpose of this? Why would I want my file to be blue?

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Perhaps the home page is more useful than the spec to explain the purpose of the file format: https://jsoncanvas.org/

See also the original inspiration for the format: https://obsidian.md/canvas

It's a reinvention of SVG with all the same problems. JSON is not any better in terms of data efficiency or fast updating. It's like these people have never done graphics programming.

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