Validate XML document well-formedness and detect syntax errors with native DOMParser diagnostics.
The XML syntax is well-formed with matching tags and valid attributes.
The Todoal XML Validator is a fast, browser-native markup linting tool designed to verify XML well-formedness and detect syntax errors in real time. XML enforces strict structural rules: every opening tag must have an exact matching closing tag, attribute values must always be enclosed in quotes, elements must be properly nested without overlapping, and special characters (like <, >, and &) must be entity-encoded.
Our validator uses native browser DOMParser engines to parse XML payloads, immediately catching unclosed tags, attribute syntax violations, invalid root node configurations, and encoding issues with precise error line numbers and descriptive diagnostic messages.
Instantly identifies the exact line number, column, and tag name causing XML parsing failures, enabling rapid debugging of large configuration files and feeds.
Validates single root element rules, proper tag nesting depth, XML namespace prefixes (xmlns), and CDATA section integrity.
Download validated XML documents directly as .xml files or copy clean markup to your clipboard with keyboard shortcuts (Ctrl+Enter).
All validation executes locally in your browser memory. No proprietary enterprise schemas, configuration files, or data feeds are ever uploaded to third-party servers.
Validation is the first step toward robust data pipelines. Once validated, format and beautify your XML documents with our companion XML Formatter, or inspect scalable vector graphics with the SVG Viewer. For web markup and data serialization, format HTML with the HTML Formatter, validate JSON schemas with the JSON Validator, and format JSON payloads with the JSON Formatter.
For database and script workflows, format SQL queries using the SQL Formatter, format scripts with the JavaScript Formatter, and test regex patterns with the Regex Tester. Explore all tools in the Developer Tools Suite.
<item>) must have a corresponding closing tag (</item>) with identical case sensitivity.id="123").& unless enclosed inside CDATA blocks.Leverages native browser DOMParser to detect unclosed tags, attribute quote mismatches, illegal characters, and schema violations with high precision.
Ensures CDATA blocks and named entity references are structured correctly without breaking the overall document tree hierarchy.
Unlike web browsers which can tolerate minor HTML syntax quirks, enterprise XML parsers operate on strict 'fail-fast' XML specifications. An unescaped ampersand in an RSS feed, a missing closing slash in an SVG element, or a mismatched case in an Android manifest will cause SOAP endpoints and compilation tools to abort instantly. Running your XML payloads through Todoal's local validator guarantees document well-formedness before deployment.
Large XML documents—such as Google XML sitemaps, RSS podcast feeds, financial payment schemas, and SVG icon sets—must strictly adhere to XML syntax rules. A single unescaped ampersand or missing closing tag will cause search engine crawlers and feed aggregators to reject the entire document. Todoal's XML Validator performs deep well-formedness parsing in client memory, identifying exact line errors instantly.
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