CSP for Monaco Editor Embeds

Monaco Editor is one of those libraries that looks simple until you deploy it behind a strict Content Security Policy. Then the fun starts: web workers, dynamic loading, styles, fonts, and sometimes blob URLs depending on how you bundle it. If you’re embedding Monaco on a site with a real CSP, you need to decide two things early: Are you self-hosting Monaco assets or pulling them from a CDN? Are Monaco workers loaded as separate files, or through blob: URLs? That choice changes your policy a lot. ...

August 19, 2026 · 6 min · headertest.com