TypeScript Formatter

Formats TypeScript code to a consistent style for developers, teams, and automated workflows, ensuring readability and maintainability across projects.

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1,420+
Total Calculations Run
< 15ms
Browser Execution Speed
100%
Client-Side Privacy
4.9 / 5.0
User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how TypeScript Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}
Computed Result { "id": 1, "status": "active", "roles": [ "admin" ] }
Execution Mode Client-Side In-Browser JS
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About This Tool

The tool formats TypeScript and TSX/JSX code to a consistent style across teams and CI pipelines. It solves the problem of inconsistent indentation, quotation rules, and semicolon placement. By enabling reproducible formatting, it reduces unnecessary diffs in pull requests and accelerates code reviews.
The formatter analyzes TypeScript/TSX source code, constructs an AST, and emits normalized output according to a configurable style. Required features include correct parsing of TS syntax, preservation of comments, and deterministic output. Advanced features include tsconfig-aware options, multi-file formatting, incremental processing, and custom rule sets. It supports common options like semicolon usage, string quotes, trailing comma handling, tab width, and line length.
Efficiently handles large codebases and integrates with existing npm tooling for seamless adoption in existing pipelines.
Who benefits: developers, teams enforcing a shared style, and CI systems that enforce formatting as part of the build. It is especially helpful in large monorepos where multiple contributors introduce style drift. It provides deterministic results so cross-branch diffs are minimized.
Core value and features: AST-based formatting, tsconfig awareness, multi-file processing, and robust error handling. It does not perform semantic refactoring or linting; it focuses strictly on presentation rules. Use it to standardize code and improve maintainability without changing behavior.

How to Use

  1. Provide inputs: supply the TypeScript source code and optional formatting options (semi, singleQuote, trailingComma, tabWidth, useTabs).
  2. Set formatting preferences: adjust rules for semicolons, quotes, trailing commas, and line width as needed.
  3. Execute formatting: run the formatter via npm script or tool invocation on the target input(s).
  4. Review outputs: receive formatted code and a summary of changes or diffs in metadata.
  5. Apply changes: write the formatted code back to files or export as patches for review.
How to use typescript formatter npm

Frequently Asked Questions

Find Quick Answers

What languages does it format?
The tool formats TypeScript and TSX/JSX syntax. It respects project tsconfig rules and preserves comments and type annotations while normalizing whitespace and line breaks.
Can it format multiple files or an entire project?
Yes. It supports file globs or directory inputs and can produce per-file formatted outputs along with a summary, making it suitable for batch formatting in CI or pre-commit hooks.
How does it handle comments?
Comments are preserved and repositioned to maintain their association with code blocks. The formatter avoids altering semantics while normalizing layout, ensuring comments remain attached to relevant code.
Is it safe for CI integration?
Yes. It can run as part of a build or pre-commit workflow, producing deterministic output for identical inputs and options, with structured metadata for auditing formatting changes.

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