JavaScript Minifier / Formatter

The minifier is a single linear pass over the input — tokenize and re-emit. It is safe on every syntactically valid JavaScript file but conservative on what it rewrites.

It does

• Strip /* block */ and // line comments.
• Collapse runs of whitespace into a single space (or not — your call).
• Remove a trailing semicolon immediately before }.
• Pretty-print with a configurable indent string.

It does not

• Mangle identifier names. Manglng breaks stack traces, source maps, and any runtime property lookup (window.foo, globalThis.bar). The cost is too high for a general-purpose tool.
• Hoist, merge, or fold statements. Without a real AST, every such transform has a counterexample.
• Touch content inside strings, template literals, regex literals, or comments — including things that look like comments inside a string.