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What do you mean by “it doesn’t work”? It’s possible to store pretty much any kind of data in a JSON, even binary if you’re into that - storing octree should actually be quite easy, since it’s just boundaries.
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Not directly an answer to the question, but most likely an answer to your challenge overall (ie. there’s little reason for reinventing the wheel, if there’s a ready robust opensource alternative
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- three-mesh-bvh: see this example and this example. Three-mesh-bvh runs on pure optimised magic, so using it may not only spare you all the unnecessary coding, but will also likely work faster
- recast-navigation-js: this is a different approach to navigation in games (although a better one compared to raycasting, if you want to implement character movement and AI navigation.) You can combine it together with raycast collisions, since these are generally more expensive.