JavaScript Cleanup: Comments, Whitespace, and Safe Limits

JavaScript source can accumulate copied comments, inconsistent blank lines, and formatting that makes a small snippet difficult to inspect. A cleanup pass can improve readability, but JavaScript syntax has enough edge cases that removing text blindly can change program behavior.

Comments can appear near strings, regular expressions, template literals, and places where a line break affects automatic semicolon insertion. That is why a basic cleanup tool should be conservative and should never present itself as a substitute for a parser or bundler.

Use /tools/javascript-cleaner for a quick local cleanup of a small snippet when you want to inspect the remaining code. Compare the result with the original, and keep the original nearby until you have run it through the same tests or runtime that matter for the change.

For production JavaScript, use tools such as a compiler, bundler, or minifier that parse the language before transforming it. They understand syntax boundaries and can make optimizations that a simple whitespace cleanup utility should deliberately avoid.

A useful rule is to separate readability work from behavior changes. Format and review first, then make one functional change at a time with tests, so a cleanup does not hide the source of a regression.