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DOCUMENTS CONVERSION JSON XML DATA DEVELOPER

JSON to XML

Convert JSON files to well-formed XML with support for nested objects, arrays, booleans, null values, safe XML element names and formatted UTF-8 output.

Selected Files

Total Size

XML Output Options

Choose the root element, array item element and whether the generated XML should be formatted for readability.

The single top-level XML element that will contain the converted JSON structure.

JSON array entries use this element name unless another structure already provides a named parent.

Formatting

Output structure

<>
<customers>
<>...</>
</customers>
</>

Before You Begin

  • Upload one valid JSON file up to 50 MB.
  • JSON objects are converted into nested XML elements.
  • JSON arrays are converted into repeated XML elements using the selected array item name.
  • Strings, numbers, booleans and null values are preserved in the generated XML.
  • JSON keys that are not valid XML element names are normalised automatically.
  • When a JSON key is changed during XML name normalisation, the original key is preserved using a json-key attribute.
  • XML special characters are escaped safely by the XML writer.
  • Your original JSON file remains unchanged. A new XML file will be generated for download.

Example

JSON 

{
    "customers": [
        {
            "id": 1001,
            "name": "Michael",
            "active": true
        },
        {
            "id": 1002,
            "name": "Sarah",
            "active": false
        }
    ]
}

XML 

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <customers>
        <item>
            <id json-type="integer">1001</id>
            <name>Michael</name>
            <active json-type="boolean">true</active>
        </item>
        <item>
            <id json-type="integer">1002</id>
            <name>Sarah</name>
            <active json-type="boolean">false</active>
        </item>
    </customers>
</root>

JSON Objects and Arrays

Objects

Object keys become XML element names and nested objects become nested XML structures.

Arrays

Array entries are written in their original order using the configured array item element.

Root arrays

When the entire JSON document is an array, each entry is placed directly beneath the selected root element.

JSON Value Types

Strings

Strings are written as ordinary XML text with special characters escaped automatically.

Numbers and booleans

Numeric and boolean values include json-type metadata so their original JSON type remains clear.

Null values

JSON null becomes an empty XML element marked with json-type="null", keeping it distinct from an empty string.

JSON Keys That Are Not Valid XML Names

XML element names follow stricter rules than JSON object keys. SwiftVecto safely normalises incompatible keys instead of failing the whole conversion.

JSON 

{
    "customer number": "00124",
    "2026 sales": 1500
}

XML 

<customer-number
    json-key="customer number">
    00124
</customer-number>

<_2026-sales
    json-key="2026 sales"
    json-type="integer">
    1500
</_2026-sales>

The json-key attribute means the original JSON field name is still available even when the XML element itself had to be renamed.

Pretty XML

Easier to read

Pretty formatting adds indentation and line breaks so nested structures are easier for people to inspect.

Same underlying data

Turning pretty formatting off changes whitespace only. It does not change the converted JSON values or structure.

XML Output

UTF-8

Generated XML uses UTF-8 encoding.

Well-formed XML

SwiftVecto uses PHP's XMLWriter rather than manually concatenating XML strings.

XML declaration

The generated document begins with the standard XML 1.0 UTF-8 declaration.

XML Schemas and External Systems

JSON and XML do not have one universal one-to-one mapping. SwiftVecto produces a consistent general-purpose XML representation, but another application may require specific element names, namespaces, attributes or an XML schema.

Ready to Process

Your files are processed securely and automatically deleted after processing.

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How to Convert JSON to XML

Upload a JSON file and convert it into a well-formed XML document. SwiftVecto preserves nested objects, arrays, booleans, numbers and null values while safely converting JSON keys into valid XML element names.

Overview

The SwiftVecto JSON to XML converter transforms structured JSON data into XML using safe XMLWriter-based generation. Objects become nested XML elements, arrays become repeated item elements, scalar values are preserved with type metadata where useful, and invalid XML element names are normalised without silently losing the original JSON key.

Benefits

Convert JSON files into standard XML.
Support nested JSON objects.
Support JSON arrays.
Preserve array item order.
Preserve strings, integers and decimal values.
Preserve boolean values.
Represent null values explicitly.
Safely convert invalid JSON keys into valid XML element names.
Preserve original JSON keys when XML name normalisation is required.
Use configurable root and array-item element names.
Generate formatted readable XML.
Write UTF-8 XML output.
Escape XML special characters automatically.
Avoid manual XML string concatenation.
Prevent excessively deep JSON structures from exhausting recursion.
Leave the original JSON file unchanged.

How It Works

Upload one JSON file.

SwiftVecto validates and decodes the JSON structure.

JSON objects become nested XML elements.

JSON arrays become repeated item elements.

Strings are written as XML text.

Integers, numbers, booleans and nulls can include json-type metadata.

JSON keys are converted into valid XML element names.

When a key must be changed, the original key is preserved in a json-key attribute.

The XML document is generated using XMLWriter.

Download the completed XML file.

How to Use This Tool

  1. 1
    Choose or drop one JSON file.
  2. 2
    Choose the XML root element name if you want something other than root.
  3. 3
    Choose the array item element name if you want something other than item.
  4. 4
    Choose whether the XML should be pretty formatted.
  5. 5
    Start the JSON to XML conversion.
  6. 6
    Wait while SwiftVecto validates and converts the JSON structure.
  7. 7
    Download the generated XML file.

Helpful Tips

  • Use valid JSON for reliable conversion.
  • Keep the default root element unless another system expects a specific XML root name.
  • Use a meaningful array item name when the destination system expects one.
  • Pretty formatting improves readability but does not change the XML data.
  • JSON arrays do not have natural XML element names, so SwiftVecto uses the configured item element.
  • Large integer identifiers are protected during JSON decoding where possible.
  • JSON keys that begin with numbers or contain invalid XML characters are safely normalised.
  • The original JSON key is retained when element-name normalisation changes it.
  • Review generated XML if another system requires a strict predefined XML schema.

Common Uses

Convert an API JSON response into XML.

Convert customer JSON records to XML.

Convert nested application configuration JSON into XML.

Convert product arrays from JSON to XML.

Convert business-system exports from JSON to XML.

Convert JSON containing booleans and null values without losing their meaning.

Worked Examples

The following examples demonstrate how this tool can be used in realistic scenarios.

JSON object

A JSON object containing name, email and customer ID becomes nested XML elements under the selected root element.

JSON array

A JSON array containing several customer objects becomes repeated item elements while preserving the original array order.

Boolean and null values

Boolean values are written as true or false with json-type metadata, while null values become empty elements marked with json-type="null".

Invalid XML key name

A JSON key such as "2026 sales" is converted into a valid XML element name while the original key is retained in a json-key attribute.

Common Mistakes

Avoid these common mistakes to achieve the most accurate results.

  • Uploading malformed JSON.
  • Uploading XML, CSV or another format renamed to .json.
  • Expecting JSON arrays to automatically use singularised XML element names.
  • Assuming every destination system accepts arbitrary XML structures.
  • Using a root element name that conflicts with a required external XML schema.
  • Expecting JSON comments or trailing commas to be accepted as valid JSON.
  • Assuming JSON null and an empty string are equivalent.

Glossary

Definitions of the most important terms used by this tool.

JSON

JavaScript Object Notation, a text-based structured data format built from objects, arrays and scalar values.

XML

Extensible Markup Language, a structured text format that represents data using nested elements and attributes.

JSON Object

A collection of key-value pairs enclosed in braces, such as {"name":"Michael"}.

JSON Array

An ordered collection of values enclosed in square brackets.

Root Element

The single top-level XML element that contains the converted document.

Item Element

The XML element name used for values contained inside JSON arrays.

XMLWriter

A PHP XML-writing API that creates well-formed XML and handles text escaping safely.

json-type

Metadata used by SwiftVecto to distinguish certain JSON scalar types such as boolean, integer, number and null in the generated XML.

json-key

An attribute used when a JSON key must be changed to become a valid XML element name, preserving the original key.

Frequently Asked Questions

Can I convert JSON to XML?

Yes. SwiftVecto converts valid JSON documents into well-formed UTF-8 XML files.

Does it support nested JSON?

Yes. Nested objects are converted into nested XML elements.

How are JSON arrays converted?

Arrays are converted into repeated XML item elements using the configured array-item element name.

Can I change the root XML element?

Yes. The converter can accept a custom root element name. Invalid names are normalised safely.

Can I change the array item element name?

Yes. The default is item, but another valid element name can be used.

What happens to JSON booleans?

Boolean values are written as true or false and marked with json-type="boolean".

What happens to null values?

Null values become empty XML elements marked with json-type="null" so they remain distinguishable from empty strings.

Are numbers preserved?

Yes. Integers and decimal numbers are written as XML text with type metadata. Large JSON integers are decoded as strings where necessary to reduce precision loss.

What if a JSON key is not a valid XML element name?

SwiftVecto normalises the name into a valid XML element and preserves the original JSON key in a json-key attribute.

Will special characters break the XML?

No. XMLWriter handles XML text escaping for characters such as ampersands and angle brackets.

Can I pretty-format the XML?

Yes. Pretty formatting can add indentation to make the generated XML easier to read.

Does the converter create XML namespaces?

No. SwiftVecto does not invent XML namespace semantics from JSON data.

Will the XML match a specific industry schema?

Not automatically. The converter creates a faithful general-purpose XML representation of the JSON structure. A predefined schema may require a specialised transformation.

Does SwiftVecto change my original JSON file?

No. The uploaded JSON is copied into an isolated processing workspace and remains unchanged.

Things to Know

  • One JSON file is processed per conversion.
  • The JSON document must be valid JSON.
  • The default XML root element is root.
  • The default array item element is item.
  • JSON object keys become XML element names.
  • Invalid XML element names are normalised safely.
  • Original JSON keys are preserved when normalisation changes them.
  • Arrays retain their source order.
  • Null and boolean values receive explicit type metadata.
  • Integers and decimal numbers may also include type metadata.
  • XML output is UTF-8.
  • Pretty formatting can be enabled or disabled.
  • The converter does not automatically create XML namespaces or industry-specific schemas.

Disclaimer

JSON and XML represent structured data differently, so there is no single universal mapping that satisfies every external XML schema.

Generated XML may require additional transformation when a receiving system expects specific element names, namespaces, attributes or schema rules.

Very deeply nested JSON structures are rejected beyond the supported safety limit.

Users should review generated XML before using it in financial, legal, operational or other critical integrations.

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