JavaScript Beautifier

Professional JavaScript code formatter and beautifier. Transform minified or poorly formatted JS code into clean, readable, and well-organized code with proper indentation and structure.

Formatting Options:

characters

Code Style:

Advanced Options:

Preset Styles:

How to Use JavaScript Beautifier

  1. Input Code: Paste JavaScript code or upload a JS file
  2. Configure Style: Choose formatting preferences
  3. Select Preset: Use predefined style guides (optional)
  4. Beautify: Click "Beautify JavaScript" to format
  5. Review Output: Check the formatted code
  6. Download/Copy: Save or copy the beautified code

Understanding Code Beautification

✨ What is JavaScript Beautification?

JavaScript beautification is the process of formatting code to make it more readable and maintainable. It involves proper indentation, spacing, line breaks, and consistent styling without changing the code's functionality.

Before and After Examples
Basic Function Formatting
Before (Minified): 
function hello(name){if(name){console.log('Hello, '+name+'!');}else{console.log('Hello, World!');}}
After (Beautified): 
function hello(name) {
  if (name) {
    console.log('Hello, ' + name + '!');
  } else {
    console.log('Hello, World!');
  }
}
Object and Array Formatting
Before: 
const user={name:'John',age:30,hobbies:['reading','coding','gaming'],address:{street:'123 Main St',city:'New York'}}
After: 
const user = {
  name: 'John',
  age: 30,
  hobbies: ['reading', 'coding', 'gaming'],
  address: {
    street: '123 Main St',
    city: 'New York'
  }
}
Arrow Functions and Modern JS
Before: 
const numbers=[1,2,3,4,5];const doubled=numbers.map(n=>n*2);const filtered=doubled.filter(n=>n>4);
After: 
const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(n => n * 2);
const filtered = doubled.filter(n => n > 4);
Complex Control Structures
Before: 
for(let i=0;i
After: 
for (let i = 0; i < items.length; i++) {
  if (items[i].active) {
    processItem(items[i]);
    if (items[i].priority === 'high') {
      urgentItems.push(items[i]);
    }
  }
}

Formatting Options Explained

⚙️ Customization Settings

Indentation Type

Spaces: Uses space characters for indentation

Tabs: Uses tab characters for indentation

Recommendation: Spaces are more consistent across editors

Indentation Size

2 spaces: Compact, good for nested code

4 spaces: More readable, traditional choice

8 spaces: Very readable but takes more space

Brace Styles

Collapse: Opening brace on same line

Expand: Opening brace on new line

End-expand: Closing brace aligned with statement

Max Line Length

80 characters: Traditional limit, good for side-by-side viewing

100 characters: Modern standard, balances readability

120+ characters: Allows longer lines, less wrapping

Popular Style Guides

📋 Industry Standards

Google JavaScript Style Guide

Indentation: 2 spaces

Line length: 80 characters

Braces: Required for all control structures

Semicolons: Always required

Quotes: Single quotes preferred

Airbnb JavaScript Style Guide

Indentation: 2 spaces

Line length: 100 characters

Braces: Same line opening

Semicolons: Always required

Quotes: Single quotes for strings

Standard JavaScript Style

Indentation: 2 spaces

Line length: No limit

Braces: Same line opening

Semicolons: Never use semicolons

Quotes: Single quotes preferred

Prettier Style

Indentation: 2 spaces

Line length: 80 characters

Braces: Consistent formatting

Semicolons: Always add

Quotes: Double quotes preferred

Benefits of Code Beautification

🎯 Why Beautify JavaScript?

Improved Readability

Well-formatted code is easier to read and understand

  • Clear code structure
  • Consistent indentation
  • Logical line breaks
  • Proper spacing
Better Maintainability

Organized code is easier to modify and debug

  • Faster bug identification
  • Easier code reviews
  • Simplified refactoring
  • Reduced development time
Team Collaboration

Consistent formatting improves team productivity

  • Uniform code style
  • Reduced merge conflicts
  • Better code reviews
  • Easier onboarding
Professional Standards

Clean code reflects professional development practices

  • Industry best practices
  • Code quality standards
  • Professional appearance
  • Better documentation

Common JavaScript Patterns

🔧 Formatting Different Code Structures

Function Declarations
Before: 
function calculateTotal(items,tax=0.08){let total=0;for(const item of items){total+=item.price*item.quantity;}return total*(1+tax);}
After: 
function calculateTotal(items, tax = 0.08) {
  let total = 0;
  for (const item of items) {
    total += item.price * item.quantity;
  }
  return total * (1 + tax);
}
Class Definitions
Before: 
class User{constructor(name,email){this.name=name;this.email=email;}getName(){return this.name;}setEmail(email){this.email=email;}}
After: 
class User {
  constructor(name, email) {
    this.name = name;
    this.email = email;
  }

  getName() {
    return this.name;
  }

  setEmail(email) {
    this.email = email;
  }
}
Promise Chains
Before: 
fetch('/api/users').then(response=>response.json()).then(users=>users.filter(u=>u.active)).then(activeUsers=>console.log(activeUsers)).catch(error=>console.error(error));
After: 
fetch('/api/users')
  .then(response => response.json())
  .then(users => users.filter(u => u.active))
  .then(activeUsers => console.log(activeUsers))
  .catch(error => console.error(error));
Object Destructuring
Before: 
const{name,age,address:{street,city,zipCode}}=user;const{firstName='Unknown',lastName='User'}=name||{};
After: 
const {
  name,
  age,
  address: {
    street,
    city,
    zipCode
  }
} = user;

const {
  firstName = 'Unknown',
  lastName = 'User'
} = name || {};

Best Practices

✅ JavaScript Formatting Guidelines

Consistency is Key
  • Choose a style: Pick one style guide and stick to it
  • Use tools: Integrate formatters into your workflow
  • Team agreement: Ensure team uses same formatting
  • Automate: Use pre-commit hooks for formatting
Readability First
  • Logical grouping: Group related code together
  • Meaningful names: Use descriptive variable names
  • Comments: Add comments for complex logic
  • White space: Use spacing to improve readability
Modern JavaScript
  • ES6+ features: Use modern syntax consistently
  • Arrow functions: Format consistently with regular functions
  • Template literals: Use for multi-line strings
  • Destructuring: Format complex destructuring clearly

Integration with Development Tools

🛠️ Automated Formatting

VS Code Integration

Install Prettier extension and configure format on save

{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "prettier.singleQuote": true,
  "prettier.tabWidth": 2
}
ESLint Configuration

Use ESLint with formatting rules

{
  "extends": ["eslint:recommended"],
  "rules": {
    "indent": ["error", 2],
    "quotes": ["error", "single"],
    "semi": ["error", "always"]
  }
}
Git Pre-commit Hook

Automatically format code before commits

#!/bin/sh
# .git/hooks/pre-commit
npx prettier --write "src/**/*.js"
git add -A

Troubleshooting

🔧 Common Issues and Solutions

Syntax Errors After Formatting

Cause: Original code had syntax errors

Solution: Fix syntax errors before beautifying

Prevention: Validate JavaScript before formatting

Inconsistent Formatting

Cause: Mixed formatting options or incomplete processing

Solution: Use consistent settings, reformat entire file

Prevention: Use preset styles for consistency

Long Lines Not Breaking

Cause: Max line length setting too high or disabled

Solution: Adjust max line length setting

Prevention: Set appropriate line length limits

Comments Getting Misaligned

Cause: Complex comment structures or inline comments

Solution: Manually adjust comment formatting

Prevention: Use consistent comment styles

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