JavaScript Formatter

Format or minify JavaScript code with configurable indentation, line breaks, and comment handling for snippets and DevTools output.

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

JavaScript Formatter is a free online tool that adds line breaks and indentation to JavaScript code, making it easy to read. It is useful for minified JS, DevTools snippets, small script blocks, learning examples, and widget logic. The tool runs in your browser, does not execute code, and does not send data to the server.

What it does

Output

Processing

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

How to use

Paste JavaScript code, a minified snippet, a DevTools output, or a script block.
Choose a mode: format with indentation or minify.
Configure indent size, comment handling, operator spacing, and other options.
Copy the result and review warnings if the code contains TypeScript, JSX, template literals, or complex syntax.

More about this tool

JavaScript Formatter quickly brings a JavaScript snippet to a readable form with line breaks and indentation. The tool is useful for minified JS, snippets from DevTools, small script blocks, learning examples, widget logic, and local debugging.

You can choose 2 or 4 space or tab indentation, preserve comments, enable minification, and get warnings about complex syntax. The service does not execute code and is not a replacement for Prettier, ESLint, TypeScript compiler, or production project tooling.

All processing is done locally in the browser. Your data is not sent to the server.

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

Frequently Asked Questions

What does the JavaScript Formatter do?

It adds line breaks and indentation to JavaScript code so a fragment is easier to read, review, and edit.

Can JavaScript be minified?

Yes. In minify mode the tool removes insignificant whitespace and line breaks. It does not perform advanced minification such as variable renaming or tree shaking.

Does the tool execute JavaScript code?

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

Does this replace Prettier?

No. This is a lightweight browser formatter for small snippets. For production code, use Prettier and ESLint with your project's configuration.

Is TypeScript supported?

The primary use case is JavaScript. TypeScript syntax can be detected and a warning shown, but full TypeScript compilation and formatting is not performed.

Is JSX or TSX supported?

JSX/TSX is not the intended mode for this tool. For React code, use Prettier/Babel or a dedicated tool.

What happens to template literals?

Template literal contents should be preserved carefully to avoid breaking line breaks, string values, and expressions inside ${}.

Can the tool be used on obfuscated code?

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

Is my data sent to the server?

No. JavaScript is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.

How to use

Paste JavaScript code, a minified snippet, a DevTools output, or a script block.

Choose a mode: format with indentation or minify.

Configure indent size, comment handling, operator spacing, and other options.

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

More about this tool

All processing is done locally in the browser. Your data is not sent to the server.

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

Frequently Asked Questions

What does the JavaScript Formatter do?

It adds line breaks and indentation to JavaScript code so a fragment is easier to read, review, and edit.

Can JavaScript be minified?

Yes. In minify mode the tool removes insignificant whitespace and line breaks. It does not perform advanced minification such as variable renaming or tree shaking.

Does the tool execute JavaScript code?

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

Does this replace Prettier?

No. This is a lightweight browser formatter for small snippets. For production code, use Prettier and ESLint with your project's configuration.

Is TypeScript supported?

The primary use case is JavaScript. TypeScript syntax can be detected and a warning shown, but full TypeScript compilation and formatting is not performed.

Is JSX or TSX supported?

JSX/TSX is not the intended mode for this tool. For React code, use Prettier/Babel or a dedicated tool.

What happens to template literals?

Template literal contents should be preserved carefully to avoid breaking line breaks, string values, and expressions inside ${}.

Can the tool be used on obfuscated code?

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

Is my data sent to the server?

No. JavaScript is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.