YAML / XML Converter

Tool guide

What is YAML / XML Converter?

YAML and XML Converter links two common configuration formats through JSONLane's restricted data model. Unsafe YAML features and XML DTD or ENTITY declarations are rejected; attributes use @attributes, text uses #text, and repeated elements become arrays for clear, testable mappings. Common workflows include the following. Convert YAML configuration for a legacy XML integration. Turn an XML request example into editable YAML. Review mappings for attributes, text, and repeated elements. The page also documents input boundaries, output behavior, and practical cautions so you can review the result before putting it into an application, configuration, test, or production workflow.

When to use it

Convert YAML configuration for a legacy XML integration.
Turn an XML request example into editable YAML.
Review mappings for attributes, text, and repeated elements.

How to use it

Ensure YAML has one key for the XML root.
Use @attributes and #text for attributes and text.
Convert and read loss warnings.
Manually review namespaces and mixed content.
Load one of the realistic examples first to verify the selected options and processing direction before replacing it with your own data.
Review the output, status message, and documented limits; copy, download, or continue only after the result matches your expectation.

Runnable examples

The “Example 1” and “Example 2” buttons load the matching inputs. They cover different structures, directions, or boundaries and can be run directly in the workspace.

Example 1

catalog:
  "@attributes":
    lang: en
  tool:
    - "@attributes": { id: 31 }
      "#text": TOML Converter
    - "@attributes": { id: 40 }
      "#text": YAML CSV Converter

Example 2

<release version="1.5"><tools><tool id="31">TOML Converter</tool><tool id="40">YAML CSV Converter</tool></tools><ready>true</ready></release>

Input rules

YAML to XML requires one root key.
Attributes and text use @attributes and #text.
Custom tags, external entities, and complex mixed content are unsupported.
Text input is counted before processing and is limited to 1,000,000 characters on this page; file modes apply the separate file limit shown in the workspace.
YAML to XML requires one root key.

Output rules

Repeated XML elements become YAML arrays.
YAML comments, anchors, and XML instructions are not retained.
Namespaces and mixed content require manual review.
Output reflects only the current input, direction, and options; rerun after changing a mode or value instead of treating an earlier result as current.
Complex mixed content, comments, and namespaces cannot round-trip losslessly.

Limitations and cautions

YAML to XML requires one root key.
Complex mixed content, comments, and namespaces cannot round-trip losslessly.
Custom YAML tags and XML entities are rejected.

How your data is handled

All parsing, conversion, binary encoding, and intermediate data remain in the current browser tab. JSONLane does not upload the input or retain it after refresh or close.

FAQ

Is YAML or XML content uploaded?

No. Parsing, conversion, and output generation remain in the current browser tab.

Is every round trip lossless?

No. Formats differ in types, comments, ordering, and binary capabilities; the page documents the important losses.

Why are some inputs rejected?

Unsafe integers, dangerous keys, excessive depth, and values with no clear target representation are rejected instead of silently rewritten.

How are XML attributes written in YAML?

Place them in an @attributes object and use #text for element text, matching the existing JSON/XML mapping.

Do namespaces round-trip losslessly?

Not reliably. Prefixes, declaration placement, and complex mixed content require manual review.

Can the parser load external entities?

No. XML DTD and ENTITY declarations are rejected before conversion.