Free TypeScript Formatter – Beautify TS Code Online

Format and beautify TypeScript code with customizable options. Configure indentation, quotes, semicolons, and trailing commas. Real-time formatting with instant preview. Free, fast, and browser-based.

What Is a TypeScript Formatter?

A TypeScript formatter automatically reorganizes and beautifies TypeScript code according to consistent style rules. It handles indentation, spacing, line breaks, and other stylistic elements to produce clean, readable, and maintainable code.

Why Format TypeScript Code?

Readability: Well-formatted code is easier to read, understand, and debug. Consistent formatting reduces cognitive load when reviewing code.

Team Collaboration: When all team members use the same formatting rules, code reviews focus on logic rather than style debates.

Error Prevention: Proper formatting can reveal syntax errors and structural issues that are hidden in messy code.

Professional Quality: Clean code demonstrates attention to detail and professional standards.

How to Use This Formatter

Step 1: Paste Your Code

Enter your TypeScript code in the input area. The formatter handles:

• Interfaces and types
• Classes and functions
• Arrow functions
• Generics
• All TypeScript syntax

Step 2: Configure Options

Click "Options" to customize:

Step 3: Review Output

The formatted code appears instantly in the right panel.

Step 4: Copy or Download

Copy to clipboard or download as a .ts file.

Formatting Options Explained

Indentation: Spaces vs Tabs

The eternal debate! Here's when to use each:

Spaces (Recommended):

• Consistent rendering across editors
• Industry standard (most style guides prefer)
• Better for web publishing

Tabs:

• User-adjustable display width
• Smaller file sizes
• Accessibility (users can set preferred width)

Quote Style: Single vs Double

TypeScript style guides (including TSLint, ESLint) commonly prefer single quotes.

Semicolons: Yes or No?

With Semicolons:

• Explicit statement termination
• Avoids ASI (Automatic Semicolon Insertion) issues
• Traditional JavaScript style

Without Semicolons:

• Cleaner, less cluttered code
• Modern style (growing popularity)
• Requires understanding ASI rules

Trailing Commas

Trailing commas on the last item in multiline arrays/objects:

With trailing comma:

const user = {
  name: 'John',
  age: 30,
  email: '[email protected]',  // Trailing comma
};

Benefits:

• Cleaner git diffs (adding items doesn't modify previous line)
• Easier reordering
• Consistent structure

TypeScript Formatting Best Practices

Interface Formatting

Well-formatted interface:

interface User {
  id: number;
  name: string;
  email: string;
  createdAt: Date;
  roles: string[];
  metadata?: Record<string, unknown>;
}

Guidelines:

• One property per line
• Consistent semicolon usage
• Optional properties marked with ?
• Proper indentation

Function Formatting

Arrow functions:

const fetchUser = async (id: number): Promise<User> => {
  const response = await fetch(`/api/users/${id}`);
  return response.json();
};

Traditional functions:

async function fetchUser(id: number): Promise<User> {
  const response = await fetch(`/api/users/${id}`);
  return response.json();
}

Class Formatting

class UserService {
  private readonly apiUrl: string;

  constructor(apiUrl: string) {
    this.apiUrl = apiUrl;
  }

  async getUser(id: number): Promise<User> {
    const response = await fetch(`${this.apiUrl}/users/${id}`);
    return response.json();
  }

  async getAllUsers(): Promise<User[]> {
    const response = await fetch(`${this.apiUrl}/users`);
    return response.json();
  }
}

Guidelines:

• Blank line between methods
• Access modifiers explicit
• Consistent method formatting

Generic Types

type Result<T, E = Error> = {
  success: boolean;
  data?: T;
  error?: E;
};

function handleResult<T>(result: Result<T>): T | never {
  if (result.success && result.data) {
    return result.data;
  }
  throw result.error ?? new Error('Unknown error');
}

Integration with Development Tools

VS Code Settings

Configure VS Code for TypeScript formatting:

{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "typescript.preferences.quoteStyle": "single",
  "editor.tabSize": 2
}

Prettier Configuration

Create .prettierrc:

{
  "semi": true,
  "singleQuote": true,
  "tabWidth": 2,
  "trailingComma": "all",
  "printWidth": 80
}

ESLint + Prettier

Combine linting and formatting:

npm install eslint prettier eslint-config-prettier

This Tool vs IDE Formatters

Common TypeScript Style Guides

Airbnb TypeScript

• Single quotes
• Semicolons required
• 2-space indentation
• Trailing commas
• No unused variables

Google TypeScript

• Single quotes
• Semicolons required
• 2-space indentation
• Named exports preferred
• Explicit return types

StandardJS

• Single quotes
• No semicolons
• 2-space indentation
• No trailing commas
• Space after keywords

Frequently Asked Questions

Does this validate TypeScript?

This tool formats code but doesn't validate TypeScript types. For type checking, use the TypeScript compiler (tsc).

Can it fix syntax errors?

No. The formatter works on syntactically correct code. Fix errors before formatting.

Is my code sent to a server?

No. All formatting happens locally in your browser. Your code never leaves your device.

Does it support JavaScript?

Yes! TypeScript is a superset of JavaScript. JS code formats correctly.

Can I format partial code snippets?

Yes. Paste any valid TypeScript snippet for formatting.

How does it handle comments?

Comments are preserved and properly indented with their associated code.

TypeScript vs JavaScript Formatting

TypeScript adds type annotations that require special formatting:

// TypeScript with types
function greet(name: string, age: number): string {
  return `Hello ${name}, you are ${age} years old`;
}

// Equivalent JavaScript
function greet(name, age) {
  return `Hello ${name}, you are ${age} years old`;
}

Type annotations should:

• Follow parameter name with : type
• Use spaces around | in unions
• Align consistently in interfaces

Related Tools

Explore more developer tools:

• JavaScript Formatter — Format JS code
• JSON Formatter — Beautify JSON
• SQL Formatter — Format SQL queries
• HTML Formatter — Beautify HTML
• CSS Formatter — Format CSS

Paste your TypeScript code above to format it with your preferred style. Clean, consistent code in seconds.