Why format JavaScript code?

Formatted code is: easier to read and understand, consistent across team, easier to debug, less prone to errors, and follows best practices. Good formatting shows code structure, scope blocks, and function boundaries clearly.

What are common formatting styles?

Two main styles: braces on same line (function() {}) - K&R/JavaScript standard, or braces on new line (function() {}). Use consistent indentation (2 or 4 spaces, or tabs). Tools like Prettier auto-format following config rules.

What's the difference between formatter and linter?

Formatter adjusts code appearance (spacing, indentation, line breaks). Linter checks code quality (unused variables, syntax errors, best practices). Use both: formatter for style, linter for correctness. They serve different purposes.

JavaScript Formatter - Format & Beautify JS Code

Indent:

Input JavaScript

Formatted JavaScript

Formatted JS will appear here...

Beautify JavaScript code with proper indentation and formatting. For complex JS files, consider using a professional formatter like Prettier.

What is JavaScript Formatter?

JavaScript formatters reorganize code with consistent indentation, spacing, and structure. Clean code improves readability, catches errors visually, and aids collaboration. This tool handles minified JS, messy code, and inconsistent formatting - adding proper braces spacing, statement separation, and block indentation. For production projects, consider Prettier or ESLint for automated formatting.

How to Use

Paste JavaScript code (minified or unformatted)
Select indentation preference (2 or 4 spaces)
Click 'Format JS' to beautify the code
Copy formatted output for your project

Why Use This Tool?

Convert minified JS to readable format

Consistent indentation throughout

Proper brace and block spacing

Easier debugging and code review

Quick cleanup without tool setup

Handles functions, objects, and arrays

Tips & Best Practices

2 spaces is JavaScript convention
Minified code needs formatting before editing
Format before debugging - structure reveals bugs
Use Prettier for production projects
Check bracket balance after formatting
Preserves comments in the code

Frequently Asked Questions

What does this formatter handle?

Basic JavaScript formatting: braces indentation, statement separation, operator spacing. Handles functions, objects, arrays, and basic control flow. Complex syntax (decorators, JSX, TypeScript) may not format perfectly - use Prettier for full formatting.

Should I use 2 or 4 space indentation?

2 spaces is JavaScript/TypeScript convention. 4 spaces works for teams that prefer more visible indentation. Match your project's existing style. Consistency matters more than the specific number.

What about semicolons?

This formatter preserves your semicolon usage - adding semicolons if present, respecting ASI (automatic semicolon insertion) if omitted. It doesn't enforce semicolon style. Use ESLint for semicolon rules.

Can formatting change code behavior?

No - formatting only changes whitespace, never logic. Indentation, spacing, and newlines don't affect JavaScript execution. Your code runs exactly the same before and after formatting.

What's the difference from Prettier?

This is a basic formatter for quick cleanup. Prettier is a professional formatter with full AST parsing, handling complex syntax, JSX, TypeScript, and supporting many configuration options. Use Prettier for production projects.

How do I format entire files?

Paste the full file content, format, and copy the result. For large files or multiple files, use Prettier CLI: prettier --write "src/**/*.js". This tool works best for individual snippets and quick formatting needs.

JavaScript Formatter