What is TypeScript and why should I use a TypeScript formatter?

TypeScript is a strongly-typed superset of JavaScript developed by Microsoft that adds static type definitions to your code. Using a TypeScript formatter is essential for maintaining consistent code style across your project, automatically validating syntax and type correctness, catching potential bugs before runtime, and ensuring your code follows industry best practices. Our formatter helps developers save time by automatically formatting code, validating types in real-time, and compiling TypeScript to JavaScript with optimized output for production environments.

How do I validate TypeScript syntax and check types online for free?

Simply paste your TypeScript code into the left editor panel and click the 'Validate TypeScript' button. The tool instantly performs comprehensive syntax checking and type validation using the official TypeScript compiler. You'll receive real-time feedback with specific error messages, line numbers, and actionable suggestions for fixing issues. The status indicator displays green for valid code and red when errors are detected. This validation process catches type mismatches, missing properties, incorrect function signatures, and potential null/undefined access issues before you run your code.

Can I convert TypeScript to JavaScript online and choose different ES versions?

Yes! Click the 'Compile to JS' button to instantly transpile your TypeScript code to clean JavaScript. Our tool supports multiple ECMAScript target versions including ES5, ES2015 (ES6), ES2020, ES2022, and ESNext. You can select your preferred target from the dropdown menu based on your browser compatibility requirements. The compiler handles all modern TypeScript features including decorators, async/await, optional chaining, nullish coalescing, and JSX/TSX syntax. The output JavaScript is production-ready and optimized for your chosen target environment.

What TypeScript formatting and beautification options are available?

Our formatter provides comprehensive beautification options powered by Prettier, the industry-standard code formatter. You can customize indentation with 2 spaces, 4 spaces, or tabs to match your team's coding standards. The beautifier automatically applies consistent formatting rules including semicolon usage, quote style (single vs double), trailing commas, bracket spacing, and arrow function parentheses. Additional features include import statement organization, unused code detection, and code minification for production builds. All formatting preserves your code's functionality while ensuring it follows TypeScript and JavaScript best practices.

Does this TypeScript formatter support React with TSX and JSX syntax?

Absolutely! Our formatter provides full support for TSX (TypeScript with JSX) syntax, making it perfect for React developers. It correctly handles React components, JSX elements, props typing with interfaces, hooks with proper type inference, and complex component patterns. The formatter preserves JSX formatting while applying TypeScript rules, validates component props types, checks hook dependencies, and ensures proper event handler signatures. Whether you're building class components or functional components with hooks, our tool maintains your JSX structure while formatting the surrounding TypeScript code.

How does the TypeScript type analysis feature work?

The type analysis feature provides a comprehensive overview of your TypeScript code structure. Click 'Check Types' or 'Analyze Code' to view detailed information about all interfaces, type aliases, enums, classes, and generic type parameters in your code. The analyzer displays type definitions, identifies exported types, shows inheritance relationships, and calculates type coverage percentage. This helps you understand your codebase's type architecture, identify missing type definitions, and ensure comprehensive type safety throughout your project. The analysis runs entirely in your browser using the official TypeScript compiler for accurate results.

Can I analyze import statements and optimize dependencies in my TypeScript code?

Yes! The 'Analyze Imports' feature provides a complete dependency graph showing all import statements and their sources. You can see which external packages you're using, identify relative vs absolute imports, and detect circular dependencies. The 'Organize Imports' button automatically sorts your imports alphabetically, groups them by type (external packages first, then local imports), and removes duplicate imports. The 'Remove Unused' feature detects potentially unused variables and imports, helping you clean up your code and reduce bundle size. These tools are essential for maintaining clean, efficient TypeScript projects.

What is code complexity analysis and how does it help my TypeScript development?

The complexity analysis feature calculates cyclomatic complexity by counting decision points in your code including conditional statements (if/else), loops (for/while), switch statements, and logical operators. It provides a complexity score categorized as Low (simple, maintainable code), Medium (moderate complexity), or High (complex code that may benefit from refactoring). This metric helps identify functions that are too complex, may contain bugs, or are difficult to test. Use this information to make informed decisions about refactoring, breaking down large functions, and improving code maintainability. Lower complexity generally correlates with fewer bugs and easier maintenance.

TypeScript Formatter Online

Professional TypeScript beautifier with real-time validation, comprehensive type checking, and seamless JavaScript compilation

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Complete Guide to TypeScript Formatting, Validation, and Compilation

Why Professional TypeScript Formatting Matters for Modern Development

TypeScript has become the industry standard for building scalable, maintainable JavaScript applications by adding static typing and advanced language features. However, managing consistent code style, complex type definitions, proper compilation settings, and ensuring type safety across large codebases presents significant challenges. Our professional TypeScript formatter online tool addresses these pain points by providing instant syntax validation, automatic code beautification with Prettier, comprehensive type analysis, import optimization, and seamless JavaScript compilation with multiple ES target support. Whether you're refactoring legacy JavaScript to TypeScript, building enterprise React applications, debugging type errors, optimizing production bundle sizes, or ensuring team-wide code consistency, this formatter ensures your TypeScript code is clean, type-safe, performant, and production-ready without requiring any local tooling installation.

Step-by-Step Guide: How to Format and Compile TypeScript Code

Input Your TypeScript Code: Paste your TypeScript or TSX code directly into the left editor panel for immediate processing. Alternatively, click "Upload File" to select local TypeScript files (.ts, .tsx, .mts, .cts) from your computer, or use "Load from URL" to fetch TypeScript code from remote repositories or CDNs. The editor provides intelligent syntax highlighting, bracket matching, auto-indentation, and real-time error underlining for enhanced coding experience.
Validate Syntax and Type Safety: Click "Validate TypeScript" to perform comprehensive syntax and semantic analysis using the official TypeScript compiler. The tool instantly identifies syntax errors, type mismatches, missing property definitions, incorrect function signatures, and potential runtime errors. Validation results appear in the status bar with specific error messages, line numbers, and actionable suggestions. Use "Check Types" for detailed type inference analysis and to verify all type annotations are correct.
Apply Professional Formatting: Select your preferred code style from the indentation dropdown menu (2 spaces for compact code, 4 spaces for readability, or tabs for traditional formatting). Click "Beautify" to apply Prettier-based formatting that handles complex TypeScript features including generic type parameters, decorators, conditional types, mapped types, and JSX/TSX syntax. The beautifier ensures consistent semicolon usage, quote style, trailing commas, and bracket spacing across your entire codebase.
Compile to Optimized JavaScript: Choose your target ECMAScript version from the compilation dropdown based on your browser compatibility requirements (ES5 for legacy browsers, ES2015-ES2022 for modern environments, or ESNext for cutting-edge features). Click "Compile to JS" to transpile TypeScript to clean, optimized JavaScript. The compiler handles modern features like async/await, optional chaining, nullish coalescing, top-level await, and class fields while maintaining type safety during transformation.
Analyze Code Quality and Structure: Use "Analyze Code" to view comprehensive type definitions including interfaces, type aliases, enums, and classes. Click "Analyze Imports" to review dependency graphs and identify circular dependencies. Run "Complexity Check" to calculate cyclomatic complexity metrics and identify functions that may benefit from refactoring. These insights help maintain high code quality standards and improve long-term maintainability.
Optimize and Export Results: Use "Organize Imports" to automatically sort and group import statements. Click "Remove Unused" to detect potentially unused variables and imports. Apply "Remove Types" to strip all type annotations for JavaScript output. Finally, click "Download" to save your formatted TypeScript, compiled JavaScript, or type declaration files. Use "Share Code" to generate unique URLs for team collaboration and code review.

Advanced TypeScript Features and Capabilities

Comprehensive Type System Analysis

Advanced type checking with generic inference, union and intersection type validation, conditional type evaluation, mapped type support, and template literal type analysis for complete type safety

Full TSX and JSX Support

Complete React TypeScript integration with props interface validation, hooks type inference, component generic typing, event handler signatures, and children prop type checking

Intelligent Import Optimization

Automatically organize and sort imports, remove unused dependencies, detect circular imports, convert between named and default imports, and optimize import paths for better tree-shaking

Type Declaration Generation

Generate production-ready .d.ts declaration files for library development, API documentation, and TypeScript package publishing with accurate type exports and ambient declarations

Decorator and Metadata Support

Full support for experimental decorators used in Angular, NestJS, TypeORM, and other frameworks with proper metadata reflection and decorator factory patterns

Advanced Module Resolution

Smart path resolution with baseUrl, paths alias support, module augmentation, namespace merging, and proper handling of CommonJS and ES Module interoperability

TypeScript Compiler Options and Configuration

ECMAScript Target Versions: Compile TypeScript to different JavaScript versions (ES5 for maximum browser compatibility including IE11, ES2015/ES6 for modern browsers, ES2020/ES2022 for recent environments, or ESNext for latest proposals). Each target maintains complete type safety during compilation while optimizing output syntax, polyfills, and runtime helpers based on the selected JavaScript version capabilities.

Strict Type-Checking Mode: The formatter enforces TypeScript strict mode by default, which enables all strict type-checking options including strictNullChecks (catching potential null/undefined errors), strictFunctionTypes (proper function signature matching), strictBindCallApply (type-safe function binding), noImplicitThis (explicit this typing), and noImplicitAny (requiring explicit type annotations). This comprehensive approach catches type errors that would otherwise cause runtime failures.

Module System Support: Full support for multiple module formats including CommonJS (require/module.exports for Node.js), ES Modules (import/export for modern JavaScript), AMD (Asynchronous Module Definition for browser loaders), UMD (Universal Module Definition for libraries), and SystemJS. The tool automatically handles import/export statement transformations, module resolution strategies, and interoperability between different module systems.

JSX and TSX Processing: Configure JSX factory functions for React (React.createElement), Preact (h function), Vue (custom renderers), or other frameworks. Choose between preserve mode (keeping JSX for Babel processing), react mode (compiling to React.createElement calls), or react-native mode. The formatter correctly handles JSX props typing, children validation, fragment syntax, and custom JSX pragma comments.

Code Quality Metrics and Analysis Tools

Our comprehensive analyzer provides detailed code quality metrics including cyclomatic complexity scores (measuring code decision paths), type coverage percentage (showing how much of your code is explicitly typed), dependency depth analysis (identifying tightly coupled modules), unused export detection (finding dead code), and potential code smell identification (highlighting anti-patterns). These metrics help teams maintain high code quality standards, make informed refactoring decisions, identify technical debt, reduce bug density, and improve overall codebase maintainability. The complexity analyzer specifically helps identify functions exceeding acceptable complexity thresholds (typically 10-15) that should be broken down into smaller, more testable units.

Frequently Asked Questions About TypeScript Formatting

Q: What TypeScript versions and language features are fully supported by this formatter? A: The formatter supports TypeScript 5.x with all latest language features including the satisfies operator for type validation without widening, const type parameters for improved generic inference, decorator metadata for reflection APIs, using declarations for resource management, import attributes for JSON modules, and support for upcoming ECMAScript proposals. The tool is regularly updated within 48 hours of new TypeScript releases to ensure compatibility with the latest syntax and type system improvements, making it suitable for cutting-edge TypeScript development. Q: How does the type checker handle external library dependencies and third-party type definitions? A: The formatter includes built-in ambient type definitions for common environments including full DOM API types (for browser development), Node.js core module types (for server-side code), and popular npm packages like React, Lodash, and Express. For custom types or specific library versions, you can paste interface definitions, type declaration files (.d.ts content), or import statements directly in your code. The type checker supports declaration merging, module augmentation, and global type extensions to accommodate complex typing scenarios in real-world applications. Q: Can I validate and format TypeScript configuration files like tsconfig.json? A: While primarily designed for TypeScript source code (.ts/.tsx files), the formatter can validate and beautify tsconfig.json configuration files when you switch the editor mode to JSON. It ensures your configuration follows the official TypeScript schema requirements, validates compiler options, checks for deprecated settings, suggests optimal configurations for your target environment, and highlights common misconfigurations that could lead to type-checking issues or compilation errors. This helps maintain consistent tooling configuration across your development team. Q: Does this tool support monorepo architectures and TypeScript project references? A: The formatter handles individual TypeScript files and can process code with path mappings, baseUrl configurations, and module aliases commonly used in monorepos. While it doesn't directly load entire project reference graphs (which would require file system access), you can paste relevant type definitions to establish context for cross-package type checking. For comprehensive monorepo support with project references, build order management, and incremental compilation, consider using this tool alongside your local TypeScript setup for quick validation and formatting tasks. Q: What's the difference between TypeScript errors and regular JavaScript syntax errors? A: TypeScript's type system catches errors at compile-time that JavaScript only discovers at runtime, often causing production crashes. TypeScript errors include type mismatches (assigning wrong types to variables), missing required properties (incomplete object shapes), incorrect function signatures (wrong parameter types or counts), unsafe null/undefined access (accessing properties on potentially null values), and invalid generic type arguments. JavaScript syntax errors only catch basic parsing issues like missing brackets or invalid keywords. TypeScript prevents entire categories of runtime bugs including the infamous "Cannot read property 'x' of undefined" error by ensuring type safety throughout your codebase. Q: Can I use this formatter for Angular, Vue, Svelte, or other framework-specific TypeScript? A: Absolutely! The formatter provides excellent support for framework-specific TypeScript syntax. For Angular, it handles decorators (@Component, @Injectable), dependency injection types, RxJS observable types, and template type checking. For Vue 3, it supports Composition API with proper type inference for ref, reactive, computed, and props. For Svelte, it correctly processes TypeScript in script tags with context="module" and generic component types. Enable the experimental decorator option for full Angular compatibility. The formatter preserves framework-specific patterns while applying standard TypeScript formatting rules. Q: Is my proprietary TypeScript code secure when using this online formatter? A: Yes, your code is completely secure and private. All processing happens entirely in your browser using WebAssembly (TypeScript compiler) and client-side JavaScript (Prettier). No code is ever transmitted to external servers or stored in any database. The TypeScript compiler runs locally in your browser sandbox, and no network requests are made during formatting, validation, or compilation operations. This architecture ensures your proprietary business logic, sensitive algorithms, and confidential code remain completely private. You can even use this tool offline once the page is initially loaded. Q: What specific formatting rules and code style guidelines does the beautifier enforce? A: The beautifier uses Prettier with TypeScript-optimized rules to ensure consistent code style. Specific rules include mandatory semicolons (preventing ASI issues), single quotes for strings (unless string contains single quote), trailing commas in ES5+ targets (for cleaner git diffs), arrow function parentheses when needed (maintaining clarity), consistent spacing around operators and brackets, proper line breaks for readability, max line length of 100 characters (balancing readability and screen space), and consistent indentation. All rules follow industry best practices and are battle-tested in thousands of production TypeScript projects. You can customize indentation style (2/4 spaces or tabs) while maintaining other rules for consistency.

Need assistance with TypeScript formatting, have questions about specific features, or want to suggest improvements? Visit our Support Center for comprehensive help with TypeScript-related issues, feature requests, and detailed documentation about this tool's capabilities.