Developer Tools
XML Formatter
Format, beautify, and validate messy XML strings. 100% client-side and secure.
XML Validator
A secure, strict, client-side XML syntax checker and validator. Ensure your XML documents are perfectly well-formed. This tool automatically parses your XML, counts elements and attributes, and flags precise line/column locations of any missing closing tags, invalid nesting, or illegal characters.
Validation Report
Elements -
Attributes -
Lines -
What is the XML Validator?
The XML Validator analyzes your XML payload to verify that it is syntactically well-formed, identifying exact line numbers and columns where structural errors occur.
How to Use
- Paste your raw XML code into the input area or upload a `.xml` file.
- The tool instantly analyzes the code as you type (or when you click Validate).
- If the XML is valid, you will see a green success banner along with stats (element count, attribute count, line count).
- If the XML is invalid, a red error banner will highlight the exact error message provided by the parsing engine, including the line and column number.
Common Use Cases
- Debugging broken SOAP or REST API XML responses.
- Checking configuration files (like Tomcat server.xml or Maven pom.xml) before deploying to production.
- Locating hard-to-find unclosed tags in massive XML data dumps.
Key Benefits
- Provides exact line and column numbers for rapid debugging.
- Counts total structural elements for quick document analysis.
- 100% client-side execution means it is instantly fast and completely private.
Frequently Asked Questions
What does "well-formed" XML mean?
A well-formed XML document strictly adheres to the XML syntax rules. This means it must have a single root element, all tags must be properly nested and closed, attribute values must be quoted, and special characters must be properly escaped.
Does this tool validate against an XSD schema?
Currently, this tool focuses on structural validation (checking if the XML is well-formed and syntactically correct). Strict schema (XSD/DTD) validation typically requires external schema fetching which is outside the scope of this client-side syntax checker.
Is my XML data safe?
Absolutely. The XML Validator processes all data locally in your browser using the native `DOMParser` API. Your files and text are never transmitted to our servers.
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