Free developer tool

JavaScript, JSON & CSS minifier

Minify JavaScript with Terser, JSON with the browser parser, or CSS with CSSO entirely in your browser with no code upload or execution.

Runs locallyUpdates as you type

Language

Input

Output

Your result will appear here.

Processed only on this device

About this tool

What javascript, json & css minifier does

Reduce JavaScript, JSON, or CSS source size with language-aware parsing, compression, and whitespace removal.

How it works

Bundled Terser and CSSO processors handle JavaScript and CSS. JSON is parsed for validity and serialized without insignificant whitespace. All processing stays local and supplied code is never executed.

Common uses

When to use it

Minify a JavaScript module for a small static asset
Compact JSON for a request or fixture
Compress CSS before embedding it

Scope

Limits to know

Aggressive JavaScript name mangling can make debugging harder
Minification is not encryption or a security boundary

Worked example

Example input and result

Use the prefilled value in the tool above or paste a similar value of your own.

Input

function greet(name) {
  const message = `Hello, ${name}!`;
  return message;
}
console.log(greet('admin'));

Result

function greet(e){return`Hello, ${e}!`}console.log(greet("admin"));

Quick answers