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Would this be overkill to use just for a textbox with realtime code highlight (for SQL)? That's the only feature I'm interested in.

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Yes, you probably want something like CodeMirror https://codemirror.net/

I'd second CodeMirror - I've been tinkering with it (v2 - https://codemirror.net/2/) for a couple of weeks and it's pretty nice to use. I'm using a bit of simple syntax highlighting.

There's also a react wrapper (for versions 1 and 2).

Check out Ace Editor too: https://ace.c9.io/

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