I'm not sure why it popped up today, but it's nice to see it on HN again! A brief timeline with some links to past discussions:

- 2022: The .canvas open format was created for Obsidian Canvas [0].

- 2024: Official 1.0 spec of JSON Canvas [1].

- 2024-2025: A number of apps/libraries built up around conversion, storage, and import/export [2].

- 2026: Obsidian Skills [3] includes support for .canvas (along with .md and .base) to make it easy for LLMs to read/write JSON Canvas, and opens interesting visualization/interaction patterns with agents.

[0]: https://news.ycombinator.com/item?id=34066824

[1]: https://news.ycombinator.com/item?id=39670922

[2]: https://jsoncanvas.org/docs/apps/

[3]: https://github.com/kepano/obsidian-skills