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JavaScript Formatter

Formats JavaScript code with proper indentation, consistent spacing, and syntax structure — supports modern ES6+ features and async patterns.

100% Local Browser Native

How to Use the JavaScript Formatter

1. Paste JavaScript

Scripts of any era or size.

2. Set style rules

Indent, quotes, and semicolon policy.

3. Copy formatted code

Standardized output, logic untouched.

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Frequently Asked Questions

Semicolons added or removed?

Your choice: enforce, strip (ASI-safe patterns), or preserve. Mixed-style legacy files normalize to one rule in a single pass.

Single or double quotes?

Configurable with template literals untouched. JSX attributes follow the same rule for consistency.

ES5 or modern syntax?

Both parse: var-era scripts through ES2024 modules, classes, and optional chaining. Syntax never upgrades — only spacing normalizes.

Does JS code leave the browser?

No — formatting runs locally in your browser. Code never leaves your device.

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Last updated October 2026