JavaScript Formatter

Online tool for basic JavaScript formatting with indentation, line breaks, and minification.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

JavaScript Formatter is a free online tool for formatting JavaScript fragments with indentation or minification. Processing runs locally in your browser.

What it does

Output

Processing

Continue working

Choose a related tool for the next step.

Data passed between tools is kept only in the current browser session.

How to use

Paste JavaScript code, minified fragment, DevTools snippet, or script block.
Choose mode: format with indentation or minify.
Configure indent, comments, spaces around operators, and other options.
Copy the result and review warnings if code contains TypeScript, JSX, template literals, or complex syntax.

More about this tool

JavaScript Formatter helps quickly bring JavaScript fragments to readable form with indentation and line breaks.

Useful for minified JS, DevTools snippets, small script blocks, learning examples, widget logic, and local debugging. Choose 2 or 4 space or tab indent, preserve comments, enable minification, and get warnings for complex syntax.

The service does not execute code and does not replace Prettier, ESLint, TypeScript compiler, or production project settings.

Processing runs locally in your browser.

Formats JavaScript with indentation
Can minify JS
Does not execute code
Suitable for snippets, DevTools, and small script fragments
Shows warnings for complex syntax
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the JS formatter do?

It adds line breaks and indentation to JavaScript so fragments are easier to read, check, and edit.

Can I minify JavaScript?

Yes. Minify mode removes non-significant whitespace and line breaks. It does not perform advanced minification, renaming, or tree shaking.

Does the service execute JavaScript code?

No. The tool only formats text and must not execute code via eval, new Function, or a sandbox runner.

Does this replace Prettier?

No. This is a lightweight browser formatter for small fragments. For production code use Prettier and ESLint with project settings.

Is TypeScript supported?

The main scenario is JavaScript. TypeScript syntax may trigger a warning but full TypeScript compile and format is not performed.

Is JSX or TSX supported?

JSX/TSX is not the main mode. For React code use Prettier/Babel or a dedicated tool.

What happens to template literals?

Template literal content should be preserved carefully so line breaks, strings, and ${...} expressions are not broken.

Can I use this for obfuscated code?

It may make some code more readable but does not deobfuscate logic, rename variables, or analyze behavior.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

How to use

Paste JavaScript code, minified fragment, DevTools snippet, or script block.

Choose mode: format with indentation or minify.

Configure indent, comments, spaces around operators, and other options.

Copy the result and review warnings if code contains TypeScript, JSX, template literals, or complex syntax.

More about this tool

JavaScript Formatter helps quickly bring JavaScript fragments to readable form with indentation and line breaks.

The service does not execute code and does not replace Prettier, ESLint, TypeScript compiler, or production project settings.

Processing runs locally in your browser.

Formats JavaScript with indentation
Can minify JS
Does not execute code
Suitable for snippets, DevTools, and small script fragments
Shows warnings for complex syntax
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the JS formatter do?

It adds line breaks and indentation to JavaScript so fragments are easier to read, check, and edit.

Can I minify JavaScript?

Yes. Minify mode removes non-significant whitespace and line breaks. It does not perform advanced minification, renaming, or tree shaking.

Does the service execute JavaScript code?

No. The tool only formats text and must not execute code via eval, new Function, or a sandbox runner.

Does this replace Prettier?

No. This is a lightweight browser formatter for small fragments. For production code use Prettier and ESLint with project settings.

Is TypeScript supported?

The main scenario is JavaScript. TypeScript syntax may trigger a warning but full TypeScript compile and format is not performed.

Is JSX or TSX supported?

JSX/TSX is not the main mode. For React code use Prettier/Babel or a dedicated tool.

What happens to template literals?

Template literal content should be preserved carefully so line breaks, strings, and ${...} expressions are not broken.

Can I use this for obfuscated code?

It may make some code more readable but does not deobfuscate logic, rename variables, or analyze behavior.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.