JavaScript Beautifier & Formatter
Unminify, format, and structure messy or compressed JavaScript code with customizable indentation and syntax checks.
What is the Online JavaScript Beautifier & Formatter?
The NexTools JavaScript Beautifier is an online code formatting utility designed to turn minified, packed, or poorly indented JavaScript, TypeScript, and JSON files into cleanly indented, human-readable code. Minified scripts frequently collapse whitespace, remove line endings, and pack entire functions onto a single line to save bandwidth. While ideal for production deployment, it makes debugging, auditing, and learning from third-party libraries nearly impossible.
Our beautifier reconstructs code hierarchy by inserting proper indentation levels, aligning closing braces, managing inline operators, and ensuring code conforms to standard clean code conventions without modifying any runtime behavior.
Key Capabilities of JavaScript Beautifier
Flexible Indentation Control
Choose between 2 spaces (standard for Google, Airbnb, and React projects), 4 spaces (classic standard), or true Tabs to fit your team's style guide.
Brace Placement Alignment
Format block braces according to standard K&R style (braces inline with function/loop declarations) or Allman style (braces starting on a fresh line).
TypeScript & JSON Compatible
Works seamlessly with modern ES6+ modules, async/await arrow functions, TypeScript interface definitions, and JSON payload structures.
100% Client-Side Privacy
Formatting algorithms run entirely in your local browser sandbox. Proprietary client-side logic, API secrets, and source code are never transmitted to external servers.
Step-by-Step: How to Beautify JavaScript Code
- Paste or upload code: Paste minified JS code into the left editor, or click "Upload .js" to read an existing file.
- Configure formatting options: Select your preferred indentation (2 spaces, 4 spaces, or Tab) and brace style.
- Review the beautified output: The formatted code is generated instantly in the right panel with clear nested indentation.
- Copy or download: Click "Copy JS" to send the output to your clipboard, or "Download" to save the formatted file locally.
Frequently Asked Questions (FAQ)
Does beautifying JavaScript alter its execution logic?
No. Beautification only reformats whitespace, indentation, and line breaks. It never renames variables, changes expression evaluation order, or removes statements.
Can a beautifier recover original variable names from minified JS?
No. When JavaScript is mangled during minification (e.g. converting calculateTaxAmount to a), the original identifiers are discarded unless a source map (.map file) is available. Beautifiers restore indentation and structure, but identifiers remain as they were minified.
Why should I use 2 spaces vs 4 spaces for JavaScript?
2 spaces is the standard recommended by Google, Airbnb, and npm guidelines because JavaScript code frequently involves deep callback nesting, object literals, and promises. 2 spaces prevents lines from stretching too far horizontally.
Can I format JSON with this tool as well?
Yes. Any valid JSON string pasted into the editor will be formatted with correct line breaks, indentation, and key-value alignment.