JavaScript Minifier

Minification shrinks JavaScript so it downloads and parses faster, since the engine ignores comments and most whitespace. This tool performs three text substitutions with regular expressions: it deletes single-line comments (everything after // to the end of the line), deletes block comments (/* ... */), and collapses every run of whitespace — spaces, tabs, and newlines — down to one space, then trims the ends. It does not parse the code into an abstract syntax tree, so it has no understanding of strings, template literals, or regex literals. That has real consequences. A URL inside a string, such as 'https://example.com', contains // and gets truncated mid-string, breaking your code. Whitespace inside a string or template literal is also collapsed, mangling intentional formatting. And because runs are reduced to a single space rather than removed, tokens like a + b keep their spaces, so the savings are modest. There is no name mangling and no dead-code elimination. Real minifiers such as Terser, esbuild, and SWC tokenize the source first, so they preserve string contents while safely removing far more, typically reaching 60-80% reduction.