Hi all,
I’m looking to warehouse some graphs and would like to retain plotly’s interactive features. There’s of course no way to guarantee that a (data, layout) json structure that I save today will correctly generate a graphic on a future version of plotly, but historically, how good has plotly been at continuing to render old json correctly (not necessarily identically) when new versions roll out? Is it a development priority?
Hi @tobiashagge!
I’m not a long-term-user of plotly (yet), but according to Plotly’s CONTRIBUTING-file:
This project has a strong commitment to backwards-compatibility, so changing the graphical output for existing schema attributes and values, or changing the default value of an attribute, is generally only done as a mostly-backwards-compatible bug fix, for cases when the current graphical output is incorrect, nonsensical or otherwise very problematic.
Just a few weeks ago a new major release of plotly.js (3.0.0) was published and using my JSON from the 2.x version worked flawlessly without any problems.
So I’d say backward compatibility is good 
hth,
Martin