XML Validator for Config Files
Validate XML structure and check for unclosed tags. Free browser tool — no signup.
Quick Answer
Paste XML to validate its structure: check for unclosed tags, mismatched elements, and report element and attribute counts.
How to Use the XML Validator for Config Files
- Use the input area to provide your data.
- The tool processes it instantly in your browser.
- Copy or download the result.
Frequently Asked Questions
- Which config files work with this tool?
- Any JSON configuration file: package.json, tsconfig.json, .eslintrc.json, babel.config.json, VS Code settings, AWS CloudFormation templates, and more.
- What is the difference between valid and well-formed XML?
- Well-formed XML follows syntax rules (matching tags, proper nesting). Valid XML is well-formed AND matches a specific schema (DTD or XSD). This tool checks well-formedness — the foundational requirement.
About This Tool
Configuration files are at the heart of modern software development — from package.json and tsconfig.json to VS Code settings and cloud infrastructure templates. This XML Validator for Config Files is tailored for processing XML configuration files with the precision and care they require. Configuration files often contain comments (in formats that support them), version-specific settings, and carefully structured hierarchies that must be preserved during formatting. The tool processes these files while maintaining all data integrity, ensuring that indentation reveals the logical structure of configuration sections, nested settings, and conditional values. Whether you are cleaning up auto-generated configuration, merging settings from multiple sources, or preparing config files for documentation, this tool handles the task reliably.
What is XML Validator?
An XML validator checks whether your XML document is well-formed according to the XML specification. Well-formed XML requires every opening tag to have a matching closing tag, tags to be properly nested (no overlapping), elements to use consistent naming, and special characters to be properly escaped. Validation is essential before processing XML in applications, sending SOAP requests, deploying XML configuration files, and processing data feeds. This tool identifies specific structural issues: mismatched tags, unclosed elements, and nesting problems, along with reporting the number of elements and attributes found in the document.
How to Use This Tool
- Paste your XML.
- Click Validate XML.
- See whether the document is well-formed or has issues.
- Review the specific errors or structural information.
Common Use Cases
- Formatting package.json for readability
- Cleaning up tsconfig.json and eslint configs
- Processing VS Code settings.json files
- Normalizing docker compose JSON overrides
Examples
<?xml version="1.0"?><catalog><book id="bk101"><title>XML Guide</title><price>9.99</price></book></catalog>
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