XML Validator
Paste or drop any XML document and instantly check if it's well-formed. Invalid XML shows the exact error location and context. Valid XML displays element count, depth, attribute stats, and namespace info. Nothing leaves your browser.
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What This Tool Does
Validates XML document syntax in your browser, checking for well-formedness errors including unclosed tags, mismatched nesting, and illegal characters — with exact line and column numbers.
Who This Is For
- Backend developers debugging XML payloads from third-party APIs or SOAP services
- Data engineers validating XML exports before importing into downstream systems
- Anyone hand-editing XML configuration files who wants to catch errors before deployment
- Developers writing XML generation code who want to verify output structure
Example: Input: An XML document that may have unclosed tags, mismatched nesting, or encoding issues → Output: A pass/fail result with the exact line number and error description for every well-formedness violation found
How It Works
Common XML Errors This Tool Detects
| Error | Example | Fix |
|---|---|---|
| Unclosed tag | <name>Alice | Add closing </name> |
| Mismatched tags | <Name>...</name> | XML is case-sensitive — match exactly |
| Unescaped ampersand | AT&T | Use & for & |
| Unquoted attribute | <book id=1> | Quote it: id="1" |
| Spaces in tag names | <First Name> | Use underscores: <First_Name> |
| No root element | Two sibling top-level tags | Wrap in a single root element |
| Invalid characters | Control characters (0x00–0x1F) | Remove or encode them |
When to Use This Tool
- →Debugging SOAP API responses that fail to parse
- →Checking XML configuration files (.config, .csproj, web.xml) for syntax errors
- →Validating RSS or Atom feed XML before publishing
- →Verifying SVG files are well-formed before embedding in HTML
- →Checking XML output from a JSON to XML conversion
🔒 Privacy & Security
All validation runs in your browser using the built-in DOMParser API. No XML is uploaded to any server. This is important when validating XML that contains SOAP credentials, configuration secrets, API tokens, or customer data.
You Might Also Need
Related Guides & Tutorials
XML to JSON Conversion: Complete Guide with Examples
Step-by-step walkthrough for converting XML to JSON, with handling for attributes, namespaces, and arrays.
GuideJSON vs XML vs CSV: Which Data Format Should You Use?
A practical breakdown of when to use JSON, XML, or CSV — with real-world API and data pipeline examples.
TutorialHTML Best Practices for Clean Markup
Principles of clean markup that apply equally to XML — proper nesting, attribute quoting, and element naming.
Related Tools
- Need to convert XML to JSON for an API? → XML to JSON Converter
- Convert JSON payloads back to XML for SOAP services. → JSON to XML Converter
- Format and pretty-print your HTML markup. → HTML Formatter
- Validate and beautify JSON data. → JSON Validator
Frequently Asked Questions
xmllint or IDE plugins.