XML Validator Formatter

A developer-focused tool that validates and formats XML, detects well-formedness errors, and outputs clean, indented XML for debugging and integration.

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2,488+

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 Validator 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

This tool validates XML content by first checking well-formedness and then applying consistent indentation. It reports exact location of syntax errors to speed debugging and code reviews.
When formatting, users can choose indentation type and size, and opt to minify for compact pipelines. The output preserves XML declarations and DOCTYPE when present, ensuring compatibility with downstream parsers.
The process is deterministic and offline, avoiding network calls. It sanitizes external entities to protect against XXE, and provides both formatted_xml and minified_xml along with a structured error_details collection when issues exist.
Ideal for developers, data engineers, QA teams, and integration specialists who handle XML from APIs, configuration files, or data feeds; the tool improves reliability, consistency, and debugging efficiency.

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How to Use

Provide inputs: Paste XML into xml_input and set indent options.
Choose method: Select indentation type (spaces or tabs) and minification preference.
Run validation: Execute the operation to produce outputs.
Review outputs: Inspect is_well_formed, error_details, and the formatted_xml or minified_xml.
Copy or export: Copy results or download as a file.

Frequently Asked Questions

Find Quick Answers

What is well-formed XML?

Well-formed XML adheres to syntax rules such as proper nesting, closing tags, and a single root element; the validator reports exact line and column positions for any errors to guide debugging.

Can I validate against a schema?

The core tool validates well-formedness only. Schema or DTD validation is not performed by default; you would need a separate mode or tool to verify conformance against a defined schema.

How are formatting options applied?

Formatting applies a deterministic indentation with the chosen size and type, preserving document structure while producing either a readable formatted XML or a compact minified form for pipelines.

Is external entity processing blocked?

Yes. External entities are disabled by default to mitigate XXE vulnerabilities; documents containing DOCTYPE or ENTITY references may be rejected or sanitized for safety.

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