Minify JavaScript

Minify JavaScript layout while preserving strings, regexes, and token boundaries.

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ToolJavaScript Minifier

Input

Output

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How it works

Comments and nonessential whitespace are removed while quoted values, templates, regex literals, and required separators remain. This is lexical minification, not dead-code elimination or name mangling.

A syntax-preserving pass is suitable for a quick preview.
AST-aware build tools handle deeper compression.

Worked example

Minify JavaScript

Remove whitespace and comments from JavaScript code

Input

											// Utility function
function add(a, b) {
  return a + b;
}

const result = add(2, 3);

Output

												function add(a,b){return a+b;}const result=add(2,3);

When to use this

Transfer-size estimates, bookmarklets, and pre-bundle reviews minify JavaScript.

Edge cases

A newline after return can affect automatic semicolon insertion.
A slash may begin a regex or mean division.
Joining identifiers changes their token.

References

ECMAScript specification