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YAMLからXMLコンバーター

開発者

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入力

自動処理

出力

クライアント側

XML出力

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ガイド

YAMLからXMLコンバーター

Convert YAML to well-formed XML instantly. Paste your YAML content and get properly structured XML output with configurable options for array handling, null values, indentation, and XML declaration. Includes reverse XML-to-YAML conversion, validation with error reporting, and a reference guide for mapping rules.

使用方法

Paste YAML into the input area or load a sample. Configure the root element name, array handling style (repeated elements or indexed), indentation, null handling, and whether to include an XML declaration. The converter instantly produces well-formed XML output. Copy to clipboard or download as .xml file. Use reverse mode to convert XML back to YAML. The validation section shows any parse errors with line numbers.

機能

即時変換 — Paste YAML and get well-formed XML immediately. Handles nested objects, arrays, strings, numbers, booleans, and null values with proper type mapping.
配列処理 — Choose between repeated elements (each array item gets a singularized parent tag name) or wrapped elements with index suffixes. Configurable to match your XML schema requirements.
XML宣言 — Optionally include the standard XML declaration header with version and encoding attributes.
Null処理 — Configure how YAML null values map to XML: self-closing empty elements, xsi:nil attribute, or omit null elements entirely.
CDATA Support — Optionally wrap string values in CDATA sections to preserve special characters without entity escaping.
Reverse Mode — Convert XML back to YAML using the browser’s built-in DOMParser. Paste XML and get clean YAML output.
検証 — Detects invalid YAML with error messages and line numbers. Warns about YAML features that don’t map cleanly to XML (mixed-type arrays, complex keys).
Tag Name Sanitization — Automatically sanitizes YAML keys that aren’t valid XML tag names: replaces spaces with underscores, prefixes number-starting keys, removes invalid characters.

YAML to XML Mapping

YAML objects become nested XML elements: each key becomes a tag name, and values become either text content (for primitives) or child elements (for objects/arrays). Arrays require a mapping choice since XML has no native array concept — items can be repeated elements with a singularized name or wrapped with index suffixes. Booleans map to “true”/”false” text, numbers retain their string representation, and null values map to self-closing tags or xsi:nil attributes.

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How are YAML arrays converted to XML?

XML has no native array type, so arrays require a mapping convention. This converter offers two approaches: (1) Repeated elements — each array item gets the singularized parent tag name. For example, a YAML array under ‘items’ produces multiple ‘item’ elements wrapped in an ‘items’ parent. (2) Indexed elements — each item gets the parent name with an index suffix like ‘item_0’, ‘item_1’. The repeated elements approach is more common in real-world XML schemas and is the default.

What happens to YAML keys that aren’t valid XML tag names?

XML tag names have strict rules: they must start with a letter or underscore, cannot contain spaces, and have limited special character support. This converter automatically sanitizes invalid keys: spaces become underscores, keys starting with numbers get an underscore prefix, and invalid characters are removed. A warning is shown when sanitization occurs so you can verify the output matches your expectations.

Can I convert XML back to YAML?

Yes — use the reverse mode section to paste XML and convert it to YAML. The reverse converter uses the browser’s built-in DOMParser to parse the XML and then traverses the DOM tree to generate properly indented YAML. Note that the round-trip may not be perfect: XML attributes become special keys, repeated elements may be interpreted differently, and some XML structures don’t have direct YAML equivalents.

データがサーバーに送信されていますか？

No — all YAML parsing, XML generation, and reverse conversion happen entirely in your browser using JavaScript. Your data never leaves your device. The YAML parser runs client-side, and the XML-to-YAML reverse uses the browser’s native DOMParser. No API calls or data storage are involved.

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