JavaScript Formatter & Minifier
JavaScript Formatter & Minifier format javascript code online private beautify js source minify javascript without uploadMake JavaScript readable or compact
Paste JavaScript and choose Format JavaScript for consistent parser-based layout. Choose Minify for compact output suitable for testing or delivery, then verify the result in the target application.
Formatting changes presentation
A formatter standardizes line breaks, indentation, quotes, and expression wrapping based on parsed syntax. That exposes nested callbacks, conditions, object literals, and long chains without requiring manual spacing work. It does not simplify the algorithm, explain intent, or make unsafe code trustworthy.
Worked example
Paste const total=items.filter(x=>x.active).reduce((sum,x)=>sum+x.price,0);. Formatted output spaces the assignments and wraps the method chain when needed. Minified output returns a compact equivalent while retaining the calculation.
Minification deserves regression tests
A parser-based minifier can remove comments and whitespace, shorten local names, and simplify expressions. Modern JavaScript normally survives these transformations, but code that depends on function names, textual source, unusual global behavior, or build-time directives can break. Source maps, module boundaries, target browsers, and license comments also need project-level configuration.
Formatting is not security analysis
Readable code may be easier to audit, but this page does not execute or scan it. It cannot prove that dependencies are safe, DOM updates prevent injection, network requests protect credentials, or asynchronous paths handle failures. Treat unknown source as untrusted even after it looks clean.
Privacy and limitations
Source remains in this browser tab and is not uploaded by the tool. The formatter targets modern JavaScript syntax. The page does not transpile TypeScript or JSX, bundle modules, resolve imports, generate source maps, choose an ECMAScript compatibility target, or run lint rules. Use the project's own tested build configuration for production assets.
JavaScript Formatter FAQ
Does formatting change behavior?
It is designed not to, but generated output still needs application tests.
Can it format TypeScript or JSX?
No. This route has a focused JavaScript scope.
Should I replace my build minifier?
No. Production builds need project-specific module, target, source-map, and licensing settings.