I prefer the dark theme in any IDE I work with, so I thought, there has to be a way to enable a dark theme for JSFiddle.
It’s a bit hacky, but it gets the job done.
What we need to do is run a JS snippet in chrome dev tools, which alters the look of the JSFiddle editor.
Here we go:
Open your JSFiddle editor window here: https://jsfiddle.net/
Hit f12 to open chrome dev tools.
Hit ‘Cmd + Opt + I’ to open chrome dev tools.
Give the snippet a name. You can see I called mine ‘dark theme jsfiddle’.
Paste in the contents of the following file
More themes available here: https://userstyles.org/styles/browse/jsfiddle