JSON to XML Converter
Convert JSON into clean, well-formed XML instantly in your browser.
JSON Input
XML Output
- Local ProcessingYour JSON is converted entirely in your browser. Data never leaves your machine.
- Predictable MappingObjects, arrays, attributes, and text values follow explicit conversion rules.
- Flexible XML OutputConfigure root elements, attributes, arrays, formatting, and empty values.
Data Modeling
Understanding JSON to XML Mapping
XML requires a single root element, represents properties as elements or attributes, and vectorizes lists. ToolPorta maps JSON data models into clean XML according to deterministic conventions.
Because XML mandates a single enclosing root node, ToolPorta encloses your converted JSON object in a configurable <root> tag. Attributes are mapped with an '@' prefix and text nodes use '#text' for two-way fidelity with XML → JSON.
Sample Conversion Contract
{
"user": {
"@id": "42",
"name": "Alice"
}
}<root>
<user id="42">
<name>Alice</name>
</user>
</root>| JSON | XML | Example Mapping |
|---|---|---|
| Object | Element hierarchy | {"user": {...}} → <user>...</user> |
| Property | Child element | {"name": "Alice"} → <name>Alice</name> |
| @ Prefix Property | XML Attribute | {"@id": "42"} → id="42" |
| #text Property | Text content | {"#text": "Alice"} → <user>Alice</user> |
| Array | Repeated <item> elements | ["A", "B"] → <item>A</item><item>B</item> |
| null | Empty element by default | {"name": null} → <name/> |
Need to convert JSON to XML with attributes, custom root nodes, and array vectorization?
Best Practices
JSON → XML Edge Cases
Common architectural discrepancies between JSON and XML and how ToolPorta resolves them.
Arrays & Collections
JSON lists cannot exist without a tag name in XML. They are mapped into repeated <item> elements inside their parent property tag.
Null Values
Nulls can be output as empty self-closing elements (<tag/>), omitted from the output tree entirely, or emitted as string 'null'.
Invalid XML Tag Names
Keys containing spaces or starting with numbers can either be sanitized into valid XML identifiers or rejected with a diagnostic error.
Attributes vs Elements
Properties starting with '@' are promoted to XML tag attributes on the enclosing element instead of creating child tags.
Empty Objects & Arrays
Empty maps and empty lists are cleanly collapsed into self-closing XML tags when self-closing is enabled.
Special Characters
Characters like &, <, >, ", and ' are automatically escaped into valid XML entity references (&, <, >, ").
Developer Implementation Guides
Production snippets for serializing JSON data into XML documents across standard runtimes.
// Browser & Node.js via fast-xml-parser
import { XMLBuilder } from "fast-xml-parser";
const jsonData = {
root: {
user: {
"@id": "42",
name: "Alice"
}
}
};
const builder = new XMLBuilder({
ignoreAttributes: false,
attributeNamePrefix: "@",
format: true
});
const xml = builder.build(jsonData);
console.log(xml);Knowledge Base