TypeScript Formatter: Clean Code and Type-Safe Formatting for TS and TSX

TypeScript brings structure and safety to the JavaScript ecosystem, but even the most type-safe code can be a mess visually. Consistent formatting is key to maintaining large codebases, especially when working with complex types, interfaces, and TSX components.

Our TypeScript Formatter provides a dedicated, browser-based environment for cleaning up your TS and TSX code instantly.

Why a Dedicated TypeScript Formatter?

While general-purpose beautifiers exist, a dedicated TypeScript formatter like ours understands the nuances of the language:

• TSX Support: Seamlessly handles React components with embedded JSX and TypeScript types.
• Complex Types & Interfaces: Correctly indents and spaces out long type definitions and multi-line interfaces.
• Generics & Decorators: Preserves the structural intent of advanced TypeScript features.
• Arrow Functions & Enums: Formats modern syntax primitives with precision.

Features for Busy Developers

1. Real-Time Auto-Format: The output updates as you type, making it perfect for quick cleanup before you commit code.
2. Resizable Split View: Adjust the size of the input and output panels to fit your screen and your code's complexity.
3. Fullscreen Mode: Maximize the output for a focused review of large components or utility files.
4. Flexible Indentation: Choose between 2, 4, or 8 spaces to match your project's tsconfig.json or .prettierrc.

How to Use the Formatter

1. Paste your TS/TSX: Paste your code or type directly into the TypeScript Formatter.
2. Verify Indentation: Select your preferred indentation level.
3. Refine types: Use the formatted view to check for structural inconsistencies in your types and interfaces.
4. Copy and Go: Hit the "Copy" button to grab your clean code for your project.

A Complete Developer Toolkit

Need more than just formatting? Use our JSON to TypeScript Converter to generate your types first, or check out our JavaScript Beautifier for standard JS tasks.

Private and Secure

Proprietary logic and internal interfaces are valuable assets. SimplyUtils processes all TypeScript formatting entirely in your browser. No code is sent to any server, so your intellectual property remains on your machine.

Common Use Cases for TypeScript Formatting

• Formatting auto-generated TypeScript from OpenAPI specs: Tools like openapi-generator and swagger-codegen produce valid but densely formatted TypeScript. Running the output through the formatter makes it readable before adding it to your codebase.
• Cleaning up code from AI assistants: GitHub Copilot, ChatGPT, and other AI tools often produce TypeScript with inconsistent indentation that doesn't match your project's style guide. The formatter normalizes it in one click.
• Reviewing interfaces from JSON conversion: After generating interfaces with our JSON to TypeScript Converter, paste them into the formatter to ensure they match your project's indentation standard.
• Pre-commit cleanup: Before committing a large refactor, paste modified files into the formatter to verify consistent indentation across all your changes — especially useful before code review.
• Formatting third-party type definitions: Community-maintained .d.ts files from DefinitelyTyped sometimes have inconsistent formatting. Formatting them makes it easier to read and understand complex type hierarchies.

TypeScript-Specific Formatting Considerations

TypeScript introduces several constructs that require special handling in formatters beyond what a JavaScript beautifier provides:

Generic type parameters: Complex generics like Map>> need careful handling to remain readable. Our formatter adds appropriate line breaks and indentation when generics span multiple lines.

Type unions and intersections: Long union types (string | number | boolean | null | undefined) are formatted on a single line when short and split across lines when they exceed your preferred line width.

Interface vs type alias: Both receive consistent indentation and spacing. Multi-line interfaces with many properties are formatted with each property on its own line for maximum readability.

Decorators: TypeScript decorators (@Injectable(), @Component()) are placed on their own lines above the class or method they annotate, matching the convention used by Angular and NestJS.

Mapped and conditional types: Advanced type utilities like Partial, Record, and conditional types (T extends U ? X : Y) are preserved exactly as written, with spacing normalized around the operators.

Frequently Asked Questions

• What is the difference between the TypeScript Formatter and the JavaScript Beautifier? The TypeScript Formatter understands TS-specific syntax: type annotations, interfaces, generics, decorators, enums, and TSX. The JavaScript Beautifier is optimized for plain JS and JSX without type annotations.
• Does formatting change the behavior of my TypeScript code? No. Formatting only affects whitespace, indentation, and line breaks. It never changes variable names, logic, or type definitions. Your compiled JavaScript output will be identical before and after formatting.
• Can I format a .tsx file with JSX? Yes. The formatter handles TSX files with both TypeScript type annotations and embedded JSX syntax. Component definitions, prop type interfaces, and JSX expressions are all formatted correctly.
• Does the formatter enforce semicolons? The tool preserves the semicolon style present in your input — it does not add or remove semicolons. Configure your preferred style in your project's .prettierrc or tsconfig to enforce it consistently.
• Can I format declaration files (.d.ts)? Yes. Type declaration files follow the same TypeScript syntax and are formatted identically to regular .ts files. This is especially useful for maintaining clean hand-written declaration files for JavaScript libraries.