HTML JavaScript Formatter

A fast HTML and JavaScript formatter for developers, students, and code reviewers to standardize style, readability, and consistency.

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1,460+

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 HTML JavaScript 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

Formats HTML and JavaScript code to a consistent style without changing semantics. It preserves comments, string literals, and functional structure while adjusting indentation, line breaks, quote styles, attribute arrangement, and tag alignment. The formatter supports HTML, HTML5, JSX/TSX, and plain JavaScript, making it suitable for mixed-language projects.

Conceptually, the tool tokenizes input, builds language-specific representations (HTML AST or JavaScript AST), and re-serializes code using a deterministic printer. It implements common formatting rules: indentation size, newline handling, wrapping of long attributes, normalization of self-closing tags, and consistent quote usage. It can operate in strict or lenient modes to accommodate team conventions.

Who benefits: front-end teams maintaining large codebases; students learning standards; code reviewers and auditors who need stable diffs. Unique value: language-aware, multi-language formatting in a single pass, with a rich set of user-configurable options and a clean, predictable output suitable for version control and automated tooling.

Core features include language-aware parsing, a stable formatting pipeline, and a clear output with preserved semantics. Advanced features include custom indentation, line-wrapping strategies, attribute quote options, and optional preservation of user comments or specific tag layouts. Typical use cases include pre-commit formatting, CI pipelines, editor integrations, and batch reformats.

Save your calculation history with a free account

How to Use

Provide inputs: code_text, language_mode, and optional options.
Configure formatting preferences: indent_size, wrap_attributes, quote_style, max_line_length.
Run formatting: invoke the formatter to produce the formatted code.
Review outputs: compare with original and ensure semantics are preserved.
Export: copy to clipboard, download, or integrate via API/ CLI.

Frequently Asked Questions

Find Quick Answers

What languages are supported?

The formatter supports HTML, HTML5, JSX/TSX, and plain JavaScript. It parses each language with appropriate rules and prints a consistent style. CSS formatting is not included in this tool, and mixed templates are formatted according to the active language context.

Does formatting change code behavior?

No. The tool only alters whitespace, indentation, and layout. It preserves tokens, string literals, comments, and structural semantics to ensure identical runtime behavior after formatting.

Can I customize formatting rules?

Yes. You can configure indentation size, line wrapping, quote style (single vs double), and whether to normalize self-closing tags. Advanced options include attribute order handling and comment preservation policies to match team conventions.

How can I integrate formatting into workflows?

The formatter exposes programmatic interfaces suitable for CLI or API integration. It can be invoked in editors, CI pipelines, or batch processes to produce consistently formatted output across projects.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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