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What if you only know how to write Javascript?

Not a good reason. Learning Rust/Go/Java really isn't hard.

Learn more languages?

Programming languages are largely very similar, if you know one language it should not be a problem to pick up another language and write hello world code fairly quickly.

Writing a webserver in a language that offers libraries for it should also not be a problem and doable within a weekend.

If all you've got is a hammer, everything looks like a nail. If all you've got is a rock, you're going to be working even harder on pounding those nails, and god help you when you run into screws or bolts.

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