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JS Formatter & Minifier

Format and minify JavaScript code

Input JavaScript
Output

About JS Formatter & Minifier

Minified JavaScript is deliberately unreadable — one line, no whitespace, shortened variable names. When you need to understand what a vendor script or production bundle is doing, the formatter adds indentation and line breaks to make it navigable. The minifier goes the other direction — strips whitespace and comments for smaller file size. This is basic whitespace-only minification (no variable renaming, no dead code elimination) — use a proper bundler for production builds. Handles modern JavaScript syntax including arrow functions, destructuring, template literals, and async/await.

Common Use Cases

  • →Un-minifying third-party scripts to understand what they do
  • →Debugging production bundle output
  • →Quick minification when a build tool is not available
  • →Reading vendor code to debug an integration

Frequently Asked Questions

Formatting vs transpiling — what is the difference?+
Formatting only changes whitespace — logic is unchanged. Transpiling (Babel, SWC) converts syntax from one version of JavaScript to another for browser compatibility. This tool only formats.
Is this the same as Prettier?+
No. Prettier is an opinionated formatter with consistent style rules and handles edge cases thoroughly. This provides basic indentation without enforcing a style. For a real project, use Prettier.
Does minification make code faster?+
It reduces file size and therefore download time. It does not optimise the execution logic — for that, use a bundler with tree-shaking and optimisation passes.