XML Formatter

A developer-focused XML formatter that converts irregular XML into a clean, readable structure and optional minified form, with error reporting.

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648+

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 XML 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 XML Formatter analyzes input XML for well-formedness and structural consistency. It parses the document into a tree, then serializes it back using the selected formatting rules, ensuring consistent indentation, line breaks, and attribute handling. It supports both pretty-printed and minified outputs to suit development, testing, and deployment pipelines.

Conceptually the tool separates content from presentation: it preserves element relationships, namespaces, attributes, and CDATA chunks while applying a human-friendly layout. It can preserve or remove comments depending on the option chosen, and it reports errors with precise location data to speed debugging.

Who benefits: frontend and backend developers, API integrators, data engineers, and QA teams who deal with XML payloads, configuration files, or data exports. Unique differentiators include strong error diagnostics, optional comment preservation, and robust handling of common XML constructs such as namespaces and self-closing tags.

Core features include input validation, indentation control, minification, and a clean formatted output suitable for diffing and reviews, along with clear diagnostics. Typical use cases are preparing human-readable diffs for pull requests, generating consistent configuration samples, and preparing XML for automated tests.

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How to Use

Provide inputs: paste the raw XML string into the input field.
Choose formatting mode: select pretty or minified, and set indent size (default
.
Run formatter: execute the operation to produce the output.
Review outputs: inspect formatted_xml, is_valid_xml, and any errors or diagnostics.
Copy or export: copy the result or download for use in pipelines or diffs.

Frequently Asked Questions

Find Quick Answers

What happens if the XML is not well-formed?

If the input is not well-formed, the tool sets is_valid_xml to false and returns diagnostic messages with line and column numbers to help locate and fix the issue. Formatting may be partial or unavailable for invalid input.

Can I preserve comments during formatting?

Yes. Enable preserve_comments in the inputs to keep comments in their original positions in the pretty-printed output, while still applying indentation and line breaks to elements.

Does it support XML namespaces?

Yes. The formatter preserves namespace prefixes and attributes while parsing and formatting well-formed XML. It focuses on formatting correctness rather than schema validation.

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