TypeScript Formatter
Format and beautify TypeScript code with Prettier using professional style guides. Choose from Standard, Airbnb, or Google presets, or customize formatting options. Includes syntax validation, format-on-paste, and side-by-side diff viewer.
Formatting Style Guide
Options
Recommended Settings
Style Guide Presets
- •Standard: Double quotes, semicolons, 80-char line limit, ES5 trailing commas
- •Airbnb: Single quotes, 100-char limit, trailing commas everywhere
- •Google: Single quotes, 80-char limit, no bracket spacing, avoid arrow parens
- •Custom: Full control over all Prettier formatting options
Best Practices
- •Use Prettier for consistent formatting across your entire team
- •Enable format-on-paste for quick cleanup of external TypeScript code
- •Check the diff viewer to understand what Prettier changed
- •Start with a preset that matches your team's preferences
Pro Tips
- •Prettier is the industry standard used by VS Code, React, Angular, and Vue
- •The diff viewer shows exactly what changed during formatting
- •Airbnb preset enforces 100-character line limits for better readability
- •All TypeScript features (generics, decorators, types) are fully supported
Most Popular
Most users choose Standard or Airbnb presets with format-on-paste enabled
When to Use This Tool
Standardize code formatting across TypeScript projects using industry-standard style guides (Standard, Airbnb, Google). Perfect for team collaboration, code reviews, and maintaining consistent code style. Automatically formats type annotations, generics, interfaces, and decorators according to best practices.
Recommended: Team Development
Format TypeScript code generated by tools, transpilers, or AI assistants. Makes generated code readable and consistent with your project's style guide. Especially useful for code generated from JSON schemas, OpenAPI specs, or GraphQL schemas that often lacks proper formatting.
Recommended: Code Generation
Format TypeScript examples for tutorials, API docs, README files, or technical blog posts. Ensures code examples are professionally formatted and easy to read. Automatically applies consistent indentation, spacing, and line breaks that enhance code comprehension for learners.
Recommended: Documentation & Education
How It Works
Paste or type TypeScript code into the input area
Select a style guide preset (Standard/Airbnb/Google) or choose Custom
Optionally enable 'Format on paste' for automatic formatting
Tool performs basic syntax validation before formatting
Click 'Format Code' to beautify your TypeScript
Prettier formats types, generics, interfaces, and decorators
Indentation, spacing, quotes, and line breaks are normalized
Statistics show formatting changes and processing time
Toggle 'Show Diff' to see before/after comparison
Copy formatted code or download as .ts file
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side TypeScript with Prettier library for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
What's the difference between the TypeScript style guide presets?
Standard: Uses double quotes, semicolons, 80-character line limit, and ES5 trailing commas. Airbnb: Uses single quotes, 100-character line limit, trailing commas everywhere, and 'always' arrow parens. Google: Uses single quotes, 80-character limit, no bracket spacing, and 'avoid' arrow parens. All use 2-space indentation. Custom mode lets you configure every option individually.
Does Prettier change my TypeScript code logic?
No, Prettier is strictly a code formatter that only changes whitespace, indentation, line breaks, and code layout. It never modifies your code's logic, type annotations, or behavior. Your TypeScript will compile and execute identically before and after formatting. Prettier is AST-based (Abstract Syntax Tree), ensuring it fully understands your code structure before formatting.
Can Prettier format TypeScript-specific syntax?
Yes! Prettier has excellent TypeScript support and properly formats all TypeScript features including type annotations, generics, interfaces, type aliases, enums, decorators, namespaces, and JSX/TSX. It understands TypeScript's syntax completely and formats it according to best practices while preserving all type information.
What are the benefits of using Prettier for TypeScript?
Prettier is the industry standard formatter used by major projects like VS Code, React, and Vue. Benefits include: automatic formatting on save, no debates about code style, consistent formatting across teams, better code reviews (focus on logic not style), supports all TypeScript features, and integrates with all major editors and build tools.
Can I customize the formatting options?
Yes! Select 'Custom' preset to configure options including print width (line length), tab width, tabs vs spaces, semicolons, quote style, trailing commas, bracket spacing, and arrow function parentheses. While Prettier is opinionated, it provides enough options to match most team preferences. Start with a preset and tweak options as needed.
How does format-on-paste work?
When enabled, TypeScript code is automatically formatted as soon as you paste it into the input area. This is perfect for quickly cleaning up code from GitHub, Stack Overflow, documentation, or AI-generated code. The formatting happens instantly using your selected preset, saving you from manually clicking the Format button.
Is my TypeScript code safe and private?
Absolutely! All formatting happens 100% client-side in your browser using Prettier's WebAssembly build. Your TypeScript code never leaves your computer, is never sent to any server, and is not stored anywhere. The tool works completely offline after initial page load, ensuring complete privacy and security for your proprietary source code.