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1. You could in theory set a javascript string as the value of a feature and eval it on the client, but it's usually not the best idea from a security point of view. 2. Yes, if you give someone the

engineer

role, you can restrict access to specific environments. This does require a paid GrowthBook license though

Hey @future-teacher-7046 👋! Is there a way to inject JS through the visual editor or any other way without dev work?

No, that's not possible currently. You could in theory make a feature flag with JavaScript code as the value and eval it on the front end, but that can open up some pretty big security holes, so I wouldn't recommend it.