Proxmox can be run inside a Docker container — and yes, it actually works well enough to be useful for tinkering — but the method requires deliberate compromises, extra host privileges, and several manual workarounds that make it unsuitable for production and risky for anything beyond...
A JSON parse error is a common, often confounding fault that occurs when software attempts to read text that it expects to be valid JSON but finds malformed, encoded, or unexpected content instead — the symptom you see is usually a JavaScript SyntaxError such as “Unexpected token … in JSON at...