JavaScript Beautifier

What is JavaScript?

JavaScript is a high-level, interpreted programming language that is one of the core technologies of the World Wide Web. It enables interactive web pages and is an essential part of web applications. JavaScript can be used for both client-side and server-side development.

// Modern JavaScript Example
const fetchUserData = async (userId) => {
  try {
    const response = await fetch('/api/users/' + userId);
    const userData = await response.json();
    
    return {
      success: true,
      data: userData,
      timestamp: new Date().toISOString()
    };
  } catch (error) {
    console.error('Failed to fetch user data:', error);
    return {
      success: false,
      error: error.message
    };
  }
};

// Usage
fetchUserData(123)
  .then(result => {
    if (result.success) {
      console.log('User data:', result.data);
    } else {
      console.error('Error:', result.error);
    }
  });

Why Format JavaScript?

Properly formatted JavaScript improves readability, makes debugging easier, and follows best practices for maintainable code. Our formatter helps you:

• Improve Readability: Consistent indentation and spacing make code easier to read
• Debug Issues: Proper formatting helps identify syntax errors and logical problems
• Team Collaboration: Consistent formatting ensures all team members can easily understand the code
• Code Reviews: Well-formatted code makes code reviews more efficient and effective
• Maintenance: Clean code is easier to maintain and modify over time

JavaScript Best Practices

Follow these guidelines for clean, maintainable JavaScript:

• Use consistent indentation - 2 or 4 spaces for better readability
• Use meaningful variable names - Choose descriptive names that explain purpose
• Add comments for complex logic - Explain the "why" not the "what"
• Use const and let - Prefer const for immutable values, let for mutable ones
• Follow naming conventions - camelCase for variables and functions, PascalCase for classes
• Keep functions small - Single responsibility principle

Common JavaScript Errors

Here are the most frequent JavaScript formatting mistakes and how to fix them:

function calculateTotal(items){let total=0;for(let i=0;i<items.length;i++){total+=items[i].price;}return total;}

const user={
name:"John",
age:30,
email:"john@example.com"
};

const message = "Hello World"
console.log(message)
return message