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JavaScript Beautifier Formatters

JavaScript formatted successfully!

Formatting Options

Presets:

Input JavaScript

Beautified Output

Code Complexity:
Low

Drop JavaScript files here

or click to select files

Generate Configuration File

Create a configuration file for your preferred formatter:

Generated Configuration

Developer Guide

Learn how to format JavaScript programmatically and integrate formatting into your workflow.

Using Prettier (Node.js)

const prettier = require('prettier'); // Format JavaScript code const formattedCode = prettier.format(code, { parser: 'babel', semi: true, singleQuote: true, tabWidth: 2, trailingComma: 'es5', printWidth: 80 }); // Format with config file const config = await prettier.resolveConfig('.prettierrc'); const formatted = prettier.format(code, { ...config, parser: 'babel' });

Using ESLint (Command Line)

# Install ESLint npm install --save-dev eslint # Initialize configuration npx eslint --init # Format files npx eslint --fix src/**/*.js # Format with specific rules npx eslint --fix --rule 'indent: ["error", 2]' src/

Using js-beautify

const beautify = require('js-beautify').js; // Basic beautification const beautified = beautify(uglyCode, { indent_size: 2, indent_char: ' ', max_preserve_newlines: 2, preserve_newlines: true, keep_array_indentation: false, break_chained_methods: false, indent_scripts: 'normal', brace_style: 'collapse', space_before_conditional: true, unescape_strings: false, wrap_line_length: 0, wrap_attributes: 'auto', wrap_attributes_indent_size: 2, end_with_newline: true });

Formatting Rules & Best Practices

Indentation

Use consistent indentation (2 or 4 spaces). Avoid mixing tabs and spaces.

// Good if (condition) { doSomething(); } // Bad if (condition) { doSomething(); }

Quotes

Use single quotes for strings, except to avoid escaping.

// Good const name = 'John'; const quote = "It's working"; // Bad const name = "John";

Semicolons

Be consistent with semicolon usage. Either always use them or rely on ASI.

// With semicolons const x = 5; const y = 10; // Without semicolons const x = 5 const y = 10

Arrow Functions

Use arrow functions for anonymous functions and callbacks.

// Good array.map(item => item * 2); // Less preferred array.map(function(item) { return item * 2; });

Integration Tips

  • Pre-commit Hooks: Use husky and lint-staged to format code before commits
  • Editor Integration: Configure your editor to format on save
  • CI/CD Pipeline: Add formatting checks to your build process
  • Team Standards: Share configuration files across your team
  • Git Hooks: Automatically format staged files before commit

What is JavaScript Beautification?

JavaScript beautification is the process of formatting JavaScript code to improve its readability and maintainability. A JavaScript beautifier automatically applies consistent indentation, spacing, line breaks, and formatting rules to make your code more organized and easier to understand, debug, and collaborate on.

How Does JavaScript Beautification Work?

Our JavaScript beautifier uses sophisticated parsing techniques to:

  • Parse JavaScript code into an Abstract Syntax Tree (AST)
  • Apply formatting rules based on popular style guides (Standard, Airbnb, Google, Prettier)
  • Handle modern ES6+ syntax including arrow functions, async/await, and destructuring
  • Preserve code functionality while improving readability
  • Format JSX syntax for React applications
  • Maintain or adjust quote styles and semicolon usage

Benefits of Using a JavaScript Beautifier

📖 Enhanced Readability

Clean, well-formatted code is easier to read, understand, and review during code reviews.

🐞 Easier Debugging

Properly formatted code makes it simpler to spot syntax errors and logical issues.

⚡ Faster Development

Spend less time formatting manually and more time writing functional code.

🤝 Team Consistency

Enforce consistent coding standards across your entire development team.

JavaScript Formatting Examples

Before Beautification:
const users=[{id:1,name:"John"},{id:2,name:"Jane"}];function getUser(id){return users.find(user=>user.id===id);}const result=getUser(1);console.log(result);
After Beautification:
const users = [
  { id: 1, name: "John" },
  { id: 2, name: "Jane" }
];

function getUser(id) {
  return users.find(user => user.id === id);
}

const result = getUser(1);
console.log(result);

Frequently Asked Questions

What JavaScript versions are supported?

Our beautifier supports all modern JavaScript including ES6+ features like arrow functions, async/await, destructuring, template literals, classes, modules, and the latest ECMAScript proposals.

Can it format React JSX code?

Yes! Our beautifier fully supports JSX syntax used in React applications. It properly formats JSX elements, attributes, and embedded JavaScript expressions.

How do I choose between different style guides?

We offer presets for popular style guides including Standard, Airbnb, Google, and Prettier. Choose based on your team's preferences or project requirements. You can also customize individual settings.

Does it preserve code functionality?

Absolutely! Beautification only changes the formatting and appearance of your code. The functionality, logic, and behavior remain exactly the same.

Can I use this for production code?

Yes, our beautifier is safe for production code. However, we recommend using it as part of your development workflow with proper version control to track changes.

JavaScript Formatting Best Practices

  • Consistent Indentation: Use 2 or 4 spaces consistently (avoid mixing tabs and spaces)
  • Meaningful Variable Names: Use descriptive names that explain the purpose
  • Function Length: Keep functions short and focused on a single task
  • Comment Complex Logic: Add comments for non-obvious code sections
  • Use Modern Syntax: Prefer const/let over var, arrow functions where appropriate
  • Consistent Quotes: Choose single or double quotes and stick with it
  • Semicolon Usage: Be consistent with semicolon usage (always or never)
  • Line Length: Keep lines under 80-120 characters for better readability

Popular JavaScript Style Guides

Standard Style

No semicolons, 2 spaces, single quotes

Airbnb Style

Semicolons, 2 spaces, single quotes, trailing commas

Google Style

Semicolons, 2 spaces, single quotes, ES6+

Prettier

Opinionated formatter with minimal configuration

Technical Implementation

Our JavaScript beautifier leverages industry-standard parsing libraries to ensure accurate and reliable formatting:

  • Uses js-beautify library for core formatting functionality
  • Supports full ECMAScript specification including latest proposals
  • Handles edge cases like template literals, regex patterns, and comments
  • Preserves important whitespace in strings and JSX
  • Maintains source maps for debugging purposes

Whether you're working on vanilla JavaScript, Node.js applications, or modern frameworks like React, Vue, or Angular, our JavaScript beautifier helps you maintain clean, consistent, and professional code that follows industry best practices.