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XML Validator

データ開発者

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入力

自動処理

出力

クライアント側

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ガイド

XML Validator

Validate your XML documents instantly for well-formedness and syntax errors. This tool uses a standards-compliant XML parser to check your markup and pinpoint exactly where problems occur, showing line numbers, column positions, and clear error descriptions.

使い方

Paste or type your XML content into the input area. The validator automatically checks your document as you type and displays results below. If your XML is valid, you will see a green confirmation message. If there are errors, each one is listed with its line number, column position, and a description of the problem. Click “Try an example” to load a sample XML document and see the validator in action.

特徴

リアルタイム検証 – XML is validated automatically as you type, with no need to click a button
詳細なエラーレポート – Errors include line numbers, column positions, and descriptive messages to help you locate and fix issues quickly
Well-Formedness Checking – Detects unclosed tags, mismatched elements, invalid characters, and other common XML syntax problems
クライアント側処理 – All validation happens in your browser; your XML data is never sent to a server

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 よくある質問

What is the difference between well-formed and valid XML?

Well-formed XML follows the basic syntax rules of XML: proper nesting, matching tags, a single root element, and correct attribute quoting. Valid XML goes further by also conforming to a schema or DTD that defines allowed elements and structure. This tool checks for well-formedness.
What are the most common XML syntax errors?

The most common errors include unclosed tags, mismatched opening and closing tag names, missing root elements, unescaped special characters like ampersands and angle brackets, and incorrectly quoted attribute values.
Why does XML require strict syntax compared to HTML?

XML was designed as a data interchange format where precision matters. Unlike HTML, which browsers can render even with errors, XML parsers are required by specification to reject malformed documents. This strictness ensures data integrity and unambiguous parsing across different systems.