XML & YAML Tools

JSON to XML

JSON to XML passes parsed JSON to fast-xml-parser's XMLBuilder with formatting and @ attributes. The builder convention, not a schema, decides elements and attributes. Arbitrary arrays, primitive roots, invalid XML names, namespaces, declaration, ordering requirements, and round-trip expectations require review; no XSD validation is performed.

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Input

Quick answer

How do I request an attribute?

Use a key beginning with @.

Building XML requires a root and mapping

JSON keys can suggest tags, but XML requires valid names, one document element, ordered children, attributes, and namespace rules.

How it works

JSON.parse builds data and XMLBuilder writes formatted XML.

Key concepts

@ means attribute

Ordinary keys generally become elements.

Schema is external

Well-shaped output can still violate a contract.

When to use it

Create simple XML from controlled JSON.
Generate a small fixture.
Explore @-attribute mapping.

When not to use it

Do not convert arbitrary JSON without a root/schema.
Do not expect XSD compliance.
Do not assume exact round trips.

Worked examples

Element

Input: {"root":{"name":"Ana"}}
Expected output: root/name XML

Keys become tags.

Attribute

Input: {"item":{"@id":"1"}}
Expected output: item id attribute

Prefix controls mapping.

Invalid key

Input: {"has space":1}
Expected output: Invalid/unreliable XML name

No name precheck.

Common mistakes

Missing root design

XML needs one document element. Correction: Model the schema.

Assuming every key is legal

XML names have grammar. Correction: Validate names.

Calling it schema-valid

No XSD is used. Correction: Validate output.

Best practices

Define root and namespaces first.
Use valid controlled names.
Test with the target consumer.

Related operations and differences

XML to JSON

Choose XML to JSON when you need to convert XML elements and attributes into JSON.; use JSON to XML specifically for json to xml.

CSV to JSON

Choose CSV to JSON when you need to convert a header-based CSV table to JSON.; use JSON to XML specifically for json to xml.

JSON to CSV

Choose JSON to CSV when you need to convert an array of JSON objects to CSV.; use JSON to XML specifically for json to xml.

JSON to YAML

Choose JSON to YAML when you need to convert JSON data into readable YAML.; use JSON to XML specifically for json to xml.

YAML to JSON

Choose YAML to JSON when you need to convert YAML data into formatted JSON.; use JSON to XML specifically for json to xml.

CSV to TSV

Choose CSV to TSV when you need to convert comma-separated data to tab-separated data.; use JSON to XML specifically for json to xml.

Limitations and privacy

No XSD, namespace editor, declaration controls, mapping schema, name prevalidation, canonicalization, streaming, or guaranteed round trip.

The pasted data is parsed and transformed locally in this browser.

Frequently asked questions

Is output formatted?

Yes.

Are @ keys attributes?