JS Beautifier

Beautify JavaScript Code

Indentation Style:

Formatting Options:

JavaScript Formatting Quick Reference

Common Formatting Rules

Element Style Convention
Indentation 2 or 4 spaces (preferred) or tabs
Line Length 80-100 characters maximum
Braces Same line or new line (K&R vs Allman style)
Function Declarations Space after function name: function name() {}
Operators Spaces around operators: a = b + c
Commas Followed by space: [1, 2, 3]
Semicolons End statements with semicolons
Comments // Single line or /* Multi-line */

Common Style Guides

  • Google JavaScript Style Guide
  • Airbnb JavaScript Style Guide
  • StandardJS
  • ESLint Recommended Rules
  • jQuery Core Style Guidelines

About JS Beautifier

JavaScript code can sometimes become difficult to read due to minification, obfuscation, or inconsistent formatting. A JS Beautifier is a tool that helps developers format JavaScript code into a structured, readable, and properly indented format. It enhances code maintainability and debugging efficiency by applying standardized styling rules.

Web developers, frontend engineers, and software professionals often use beautification tools to clean up messy code, analyze compressed scripts, and improve collaboration in coding environments.

Core Capabilities

  • Code Formatting: Properly indents and structures JavaScript code for readability.
  • Minified Code Expansion: Converts minified JavaScript back into human-readable format.
  • Syntax Highlighting: Enhances clarity by applying different colors to keywords, functions, and variables.
  • Customizable Formatting Rules: Adjust indentation, line wrapping, and spacing preferences.
  • Cross-Platform Compatibility: Works in web browsers and supports multiple JavaScript environments.

Common Use Cases

Restoring Readability to Minified Code

Minification removes whitespace and reduces variable names to optimize file size, making JavaScript unreadable. Beautifying the code restores its original structure for easier debugging.

Example
Minified Code:
function test(){return"hello".toUpperCase()}
Beautified Output:
function test() { return "hello".toUpperCase(); }

Debugging and Code Analysis

Developers working with third-party scripts or legacy codebases can use a beautifier to make the code easier to understand and modify.

Example
Unformatted Code:
if(x){y();z();}else{w();}
Beautified Output:
if (x) { y(); z(); } else { w(); }

Standardizing Code Formatting

Consistent formatting improves collaboration among development teams by ensuring uniform code styling across projects.

Example
Before Beautification:
let a=5, b=10;function sum(){return a+b;}
After Beautification:
let a = 5, b = 10; function sum() { return a + b; }

Improving Code Readability in APIs and JSON Responses

Some JavaScript-based APIs return JSON data in compact form. Beautifying it makes the response more readable.

Example
Minified JSON:
{"name":"John","age":30,"city":"New York"}
Beautified JSON:
{ "name": "John", "age": 30, "city": "New York" }

Troubleshooting & Best Practices

Use Consistent Formatting Rules

Align beautification settings with team coding standards.

Avoid Beautifying Obfuscated Code

Some obfuscation techniques make beautification ineffective.

Enable Linting Tools

Combine with JavaScript linters like ESLint for best practices enforcement.

Check for Syntax Errors

Beautification improves readability but does not fix logical or syntax errors.

Keep Minified Versions for Production

Beautified code is ideal for development but not for deployment due to increased file size.

How to Use the JS Beautifier

  1. Paste or Upload JavaScript Code: Insert the unformatted JavaScript snippet.
  2. Select Formatting Preferences: Adjust indentation levels, line breaks, and other options.
  3. Click Beautify: The tool automatically formats the code.
  4. Copy and Use the Output: Implement the formatted JavaScript in projects or debugging sessions.

Specifications

  • Supported Languages: JavaScript, JSON, JSX, and TypeScript.
  • Indentation Options: Supports spaces (2 or 4) and tabs.
  • Line Wrapping: Customizable maximum line length.
  • Syntax Highlighting: Color-coded output for better readability.
  • System Compatibility: Works on Windows, macOS, Linux, iOS, and Android.
  • Browser Requirements: Compatible with Chrome, Firefox, Safari, and Edge.