JavaScript Formatter

Make Minified & Generated JavaScript Readable

Minified JavaScript is compressed into a single line for production efficiency, but it's unreadable when you need to debug or inspect it. Generated code from bundlers, transpilers, or code generators often lacks formatting. Trying to understand function a(b){return c(b.d)?e(b.f):null} is painful compared to properly formatted code.

This JavaScript Formatter instantly beautifies any JS code, applying consistent indentation and line breaks. Read minified bundles, debug generated code, and understand code structure at a glance.

Customize Formatting Style

Indentation Options: Choose 2-space (compact, popular in modern projects) or 4-space (traditional, readable for complex nesting).

Brace Style: Select how opening braces are placed relative to statements:

• Collapse: Braces on same line as control structures (compact)
• Expand: Braces on separate lines (readable, common in some style guides)
• End Expand: Opening brace on same line, closing on new line (balanced approach)

These options let you match your team's coding standards or project conventions.

What Formatting Does

• Breaks code into readable lines at logical boundaries
• Applies consistent indentation for nested blocks
• Separates statements for clarity
• Preserves logic and functionality while improving readability
• Makes variable names, function calls, and control flow visible

Common Developer Scenarios

Debugging Minified Code: Browser throws an error in minified code? Format it to find the bug. Errors in minified bundles point to line 1, column 50000—not helpful. Format the bundle and locate the actual problem.

Reading Generated Code: Transpilers (Babel, TypeScript), bundlers (Webpack), and code generators produce valid but unformatted output. Format it to understand what was generated.

Code Review of Build Artifacts: Need to review what a bundler or build tool produced? Format the output for human inspection.

Learning from Examples: Found code on GitHub or in documentation that's minified? Format it to study how it works.

Preparing Code for Analysis: Before analyzing code complexity, performance, or security, format it for easier inspection.

One-Click Copy

Once formatted to your satisfaction, copy the output with a single click and paste it directly into your editor, documentation, or analysis tools.

Works with Minified & Poorly Formatted Code

The formatter is forgiving. It handles:

• Single-line minified code
• Multi-line code with irregular indentation
• Missing whitespace and line breaks
• Nested structures
• All valid JavaScript syntax

Syntax Highlighting

Formatted code displays with syntax highlighting, making it even easier to read. Keywords, strings, comments, and operators are visually distinguished.

Completely Local Processing

Formatting happens entirely in your browser using the js-beautify engine. Your code never leaves your machine, so you can safely format proprietary code, internal utilities, or any sensitive JavaScript.