Free Online TypeScript Formatter

Format, beautify, and minify TypeScript code instantly. Supports interfaces, types, generics, enums, decorators, and all modern TS features.

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code Input TypeScript

// User interface with generic type
interface ApiResponse<T> {
  data: T;
  status: number;
  message: string;
}

// Type alias with union
type UserRole = 'admin' | 'user' | 'guest';

// Enum definition
enum HttpMethod {
  GET = 'GET',
  POST = 'POST',
  PUT = 'PUT',
  DELETE = 'DELETE',
}

// Class with decorator and generics
@injectable()
class UserService<T extends IUser> {
  private users: Map<string, T> = new Map();

constructor(@inject('Logger') private logger: Logger) {}

async findById(id: string): Promise<T | undefined> {
    return this.users.get(id);
  }

async create(data: CreateUserDto): Promise<T> {
    const user = { id: crypto.randomUUID(), ...data } as T;
    this.users.set(user.id, user);
    this.logger.info(`User created: ${user.id}`);
    return user;
  }
}

// Type predicate function
function isAdmin(user: IUser): user is AdminUser {
  return user.role === 'admin';
}

// Const assertion
const COLORS = ['red', 'green', 'blue'] as const;
type Color = (typeof COLORS)[number];

code Output Result

Key Features

palette

Syntax Highlighting

Color-coded TypeScript keywords, types, decorators, generics, strings, and numbers for better readability.

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Full TS Support

Full support for interfaces, type aliases, generics, enums, decorators, utility types, and all modern TypeScript syntax.

bolt

Instant Processing

All operations run locally in your browser for instant results with no server roundtrips.

lock

Privacy Protected

Your code never leaves your browser. No server storage or tracking.

Frequently Asked Questions

Getting Started

What is a TypeScript formatter?expand_more

A TypeScript formatter takes compressed or inconsistently styled TS code and rewrites it with uniform indentation, spacing, and line breaks. It supports interfaces, type aliases, generics, enums, decorators, and all modern TypeScript syntax.

Is this TypeScript formatter free?expand_more

Yes. All tools are completely free and run locally in your browser. No signup, no limits, no hidden costs.

Does the tool store my code?expand_more

No. Your TypeScript code never leaves your browser. All processing happens locally on your device.

Features & Usage

How do I format TypeScript?expand_more

Simply paste your TypeScript into the input area and click the "Format TypeScript" button. The tool provides professional-grade formatting with 2-space indentation, preserving all TypeScript-specific syntax.

Does it support decorators and generics?expand_more

Yes. Decorators (@expression), generic type parameters (<T, U extends ...>), type annotations, and utility types (Partial<T>, Pick<T, K>) are all preserved and properly formatted.

Does the formatter handle JSX in TSX files?expand_more

This tool targets TypeScript syntax (interfaces, types, generics). For TSX files with JSX expressions, we recommend using a dedicated tool like Prettier for complete JSX formatting support.

Troubleshooting

Will minifying change my type definitions?expand_more

No. This tool performs whitespace minification only. It removes unnecessary spaces and comments but preserves all TypeScript types, interfaces, generics, and decorators as-is.

Can I use this tool offline?expand_more

Yes! Once you've visited the page, all functionality works offline thanks to service workers and local processing.

Free Online TypeScript Formatter

Key Features

Syntax Highlighting

Full TS Support

Instant Processing

Privacy Protected

Frequently Asked Questions

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