Lottie Animator

Lottie is JSON, which makes it easy to write and easy to write wrongly. The failure mode is specific and nasty: a broken Lottie still parses. A missing os on a polystar, an easing handle one level too high, a layer without ip/op — the file loads, the player reports no error, and the canvas stays empty. And a correct file can still be ugly: linear, bouncy, crowded, purple.

So do not judge an animation by whether the JSON is valid. Judge it by looking at it.

Paths below are relative to this skill's directory; from another project, call them by absolute path. The renderer needs npm install once, in the repository that holds package.json.

Fast path: start from a recipe