How do I export/import canvas data to/from JSON?

[amsourav]

Libraries like fabric.js and paper.js have a toJSON() to extract canvas data as JSON. Do you plan to implement it?

[jakubfiala]

Hello! Unlike fabric.js and paper.js, Atrament is entirely bitmap-based, i.e. it does not store the stroke coordinates etc. This is because it's not really meant for complex vector rendering, you could think of it as a simple canvas manipulation addon, rather than a rendering library.

So I'm afraid there's no way we can do JSON export. We do, however, allow you to export the image with the toImage method (see readme). This gives you a DataURI that you can use to download, save to a server, etc. You can also restore it to your canvas by making an Image object with it and using drawImage.