How to use JavaScript Minifier
- Paste plain JavaScript source into the input box.
- Select Minify to load the local Terser parser and generate compact source.
- Review sizes and syntax errors, then copy or download the .js result.
A closer look
JavaScript cannot be safely minified by stripping whitespace with regular expressions. Strings, template literals, regex literals, automatic semicolon insertion, and modern syntax all affect meaning. Terser parses the program and prints a compact representation. This tool disables variable mangling and compression transformations, preserving names and avoiding assumptions about how your code is used. It supports modern JavaScript such as arrow functions and async/await; TypeScript and JSX should be compiled before input. The source is parsed as data and never executed.
A practical example
Compact const total = 2 + 3; without executing it. Variable names remain intact; this tool does not bundle imports or compile TypeScript.
A useful tip
Keep the original source for editing and run your own application tests before shipping any generated file. Comments beginning with ! or containing @license or @preserve are retained. The tool does not generate source maps or bundle imports.
Good questions. Simple answers.
Why is the size reduction smaller than a production bundler’s?
This tool removes formatting conservatively. It does not rename variables, remove unused code, merge modules, or apply compression rewrites.
Will minification run my code or resolve imports?
No. Terser reads the source without evaluating it. Import paths remain in the output and are not fetched.
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