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JSON to XML Converter

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Use ToolMint JSON to XML Converter to paste JSON or upload one .json file, validate syntax with JSON.parse, choose the XML root element and array item element, optionally map @attributes and #text conventions, convert objects, arrays, strings, numbers, booleans and null into XML, then copy or download formatted or minified .xml output. It is designed for small and medium JSON files up to 5 MB, 100 nesting levels and 10 MB of generated XML. Actual performance depends on browser memory and document structure. Parsing and conversion happen locally in the browser without uploading JSON content or generated XML to ToolMint servers.

8 min read Works in browser Privacy first

JSON to XML Converter

Validate JSON, choose XML mapping options and export XML locally.

JSON parsing and XML generation happen locally in this browser tab. ToolMint does not upload JSON files, JSON content, XML output, object keys or values to its servers or analytics.

Paste JSON or upload a file

Supports one UTF-8 .json file up to 5.0 MB.

Waiting

Upload JSON

Choose or drop one .json file. File content loads into the editor.

No file loaded0 lines0 characters0 B

XML output

Object keys become XML elements. Invalid XML names are sanitized and preserved with data-original-key.

Null: empty element

No XML output yet

Validate or convert JSON to generate XML.

Key facts

Best use case
Converting JSON API examples, configuration snippets, test payloads and standard JSON documents into XML
Input methods
Paste JSON, choose one .json file, or drag and drop one JSON file
Input format
.json UTF-8 text files and pasted JSON text
Output format
Formatted or minified XML with .xml download
Root element
Configurable root element name with root as the default
Array handling
Array values use a configurable item element with item as the default
Attribute convention
Optional @attributes and #text mapping can create XML attributes and text content when enabled
Invalid key handling
Invalid XML element names are sanitized and the original JSON key is preserved in data-original-key
Browser-safe limits
5 MB maximum input, 10 MB generated XML maximum and 100 nesting levels
Privacy model
JSON content, filenames, object keys, values and XML output are not uploaded or sent through analytics
Main limitation
Does not infer XML schemas, namespaces, attributes or DTD behavior from plain JSON
Privacy

Privacy and processing

Processing method: JSON is parsed locally in the browser with native JSON.parse. ToolMint converts the parsed value into XML using a documented element-based mapping, escapes XML text and attributes, sanitizes invalid element and attribute names, preserves changed JSON keys with data-original-key and optionally maps @attributes and #text conventions.

Privacy model: JSON input, uploaded file contents, filenames, object keys, values and generated XML are not sent through analytics or uploaded to ToolMint servers. Data remains in the current browser tab until cleared, reset, refreshed or closed.

Limitations

Limitations

  • JSON comments, trailing commas, undefined, NaN, Infinity, functions and BigInt syntax are rejected because they are not standard JSON.
  • The converter does not infer XML namespaces, attributes, schemas, DTDs or domain-specific XML models from plain JSON.
  • Invalid JSON object keys are sanitized into valid XML element names and preserved with data-original-key when changed.
  • The optional @attributes and #text convention must be shaped correctly; malformed convention values are warned about and ignored.
  • Large integers may already lose precision when parsed by JSON.parse if they exceed JavaScript safe integer range.
  • Generated XML should be reviewed before use in systems that require a strict XML schema.
  • Designed for small and medium JSON files. Actual performance depends on browser memory and document structure.
Guide

The ToolMint JSON to XML Converter lets you paste JSON or upload one .json file, validate syntax, convert the parsed value into XML, choose the root element and array item element, optionally map @attributes and #text, then copy or download .xml output. Parsing and conversion happen locally in your browser, so JSON content, uploaded files, object keys, values and generated XML are not uploaded to ToolMint servers.

This tool is designed for developers, QA teams, integration testers, technical writers and support teams who need quick XML output from API examples, configuration snippets, sitemaps, test payloads or standard JSON documents. It is designed for small and medium JSON files. Actual performance depends on browser memory and document structure.

What JSON to XML conversion does

JSON and XML represent structured data in different ways. JSON uses objects, arrays and primitive values. XML uses named elements, text nodes, attributes and a single document root. Converting JSON to XML means parsing the JSON value and applying a consistent mapping so the same data can be expressed as XML text.

ToolMint wraps the full JSON value in a configurable root element. Object properties become child elements. Array values are wrapped in the configured array item element. Strings, numbers and booleans become XML text. Null values become empty elements by default, with options to output literal null text or omit null elements when that is what your workflow expects.

How to convert JSON to XML

Paste JSON into the editor, choose one .json file from your device, or drag and drop one JSON file into the upload area. The file is read as UTF-8 text in the browser and placed into the editor so you can inspect it before conversion.

Use Validate JSON when you want syntax feedback before generating XML. Use Convert to XML when you are ready to produce output. If validation succeeds, the XML appears in a scrollable output panel. You can copy the XML or download it as converted-data.xml.

XML mapping rules

The default root element is root. If the JSON input is an object, each property becomes a child element under that root. If the JSON input is an array, each array value becomes an item element by default. You can change both names before conversion.

Root element and array item fields are validated before XML is generated. Blank names and XML declaration text are rejected. Unsafe names are sanitized and shown as warnings, so the generated output stays valid XML.

For example, the JSON value {"roles":["admin","editor"]} becomes a root element with a roles child, and each role is wrapped in the configured array item element. This keeps arrays visible and avoids joining unrelated values into one text node.

Attributes and text conventions

Plain JSON does not have XML attributes, so ToolMint does not force normal JSON into attributes. When the optional attribute convention is enabled, an @attributes object becomes XML attributes on the current element and a #text value becomes text content.

For example, {"user":{"@attributes":{"id":"42"},"#text":"Ava"}} can become <user id="42">Ava</user>. Attribute names are validated and sanitized when needed, and attribute values are escaped as XML attribute text. Malformed convention values, such as an @attributes array or object-valued attribute, are warned about and ignored instead of causing silent output corruption.

Invalid JSON keys and XML names

JSON object keys can contain spaces, punctuation, leading numbers and other characters that are not safe XML element names. ToolMint sanitizes invalid XML names instead of dropping them. When a key is changed, the generated XML element includes a data-original-key attribute so the original JSON key remains visible.

Spaces and invalid characters become underscores, leading digits are prefixed, empty keys become safe fallback names, and repeated sanitized names are made distinguishable. This approach keeps output valid while preserving traceability. It is still important to review sanitized element names before using generated XML in a strict integration, because some receiving systems expect specific XML names or namespaces.

Output options

The converter can generate formatted XML for review or minified XML for compact output. You can include or omit the XML declaration:

<?xml version="1.0" encoding="UTF-8"?>

Formatted output uses indentation to make nested objects and arrays easier to inspect. Minified output removes unnecessary whitespace between elements.

Generated XML is displayed as text in a scrollable panel. ToolMint does not render generated XML as active markup and does not use dangerouslySetInnerHTML.

JSON values and XML text

ToolMint supports standard JSON objects, arrays, strings, numbers, booleans and null. String values remain strings when parsed by JSON. Values such as "00123", "true" and "2026-07-15" are emitted as XML text without being converted into numbers, booleans or dates.

Text content escapes &, < and >. Attribute values escape &, <, >, double quotes and apostrophes. This prevents generated text from breaking XML structure.

Numbers are parsed by the browser's native JSON.parse. Very large unquoted integers may already lose precision before XML is generated because JavaScript numbers have a safe integer range. If exact large identifiers matter, keep them quoted as JSON strings.

JSON syntax that is rejected

ToolMint uses native JSON.parse, so the input must be standard JSON. Trailing commas, comments, single-quoted strings, JavaScript object literal syntax, undefined, NaN, Infinity, functions and BigInt syntax are rejected before conversion.

When the browser provides a character position for a syntax error, ToolMint translates that position into a line and column number where practical. Error messages are concise and do not expose raw stack traces.

Privacy and local processing

JSON parsing, validation, XML generation, copying and downloads happen in the browser. Uploaded files are read through browser file APIs and are not uploaded to ToolMint servers. Resetting the workflow clears the editor, file information, output and notices in the current tab.

Analytics are limited to privacy-safe operations such as validation, conversion, upload, copy, download, loading the example and reset. Analytics do not include JSON content, filenames, object keys, values, generated XML, validation details or private inputs.

Limits and limitations

ToolMint JSON to XML Converter is designed for small and medium JSON files up to 5 MB, 100 nesting levels and 10 MB of generated XML. Actual performance depends on browser memory and document structure.

If input is too large, the tool shows: "This JSON file is too large for safe browser conversion. Use a smaller file or process it with a desktop or command-line converter."

If nesting is too deep, the tool shows: "This JSON is nested more deeply than ToolMint's browser-safe limit."

If generated output is too large, the tool shows: "The generated XML exceeds ToolMint's browser-safe output limit. Use a smaller JSON file."

The converter does not infer XML namespaces, schemas, DTDs or domain-specific XML models from plain JSON. Optional @attributes mapping is available when your JSON intentionally uses that convention, but normal JSON keys remain child elements by default.

JSON comments, trailing commas, undefined, NaN, Infinity, functions and BigInt syntax are not valid JSON input. Large unquoted integers may lose precision through JSON.parse. Generated XML should be reviewed before use in systems that require a strict XML schema.

For the reverse direction, use XML to JSON Converter. To validate or reformat JSON before converting, use JSON Formatter. For adjacent data workflows, use JSON to YAML Converter, YAML to JSON Converter, JSON to CSV Converter or CSV to JSON Converter. Browse more utilities in the Developer category.

Use XML to JSON Converter for the reverse conversion, JSON Formatter for cleanup and validation, JSON to YAML Converter for YAML output, YAML to JSON Converter for YAML input and JSON to CSV Converter for tabular export. The guide JSON Tips Every Developer Should Know explains common JSON syntax, validation and safety issues.

The FAQ section below is generated from the ToolMint registry so visible answers and FAQ structured data stay synchronized.

Steps

How to use

  1. Paste JSON into the editor, choose one .json file, or drag and drop one JSON file.
  2. Use Validate JSON to check syntax before conversion when you want parser feedback first.
  3. Set the XML root element and array item element names.
  4. Choose null handling, optional @attributes/#text mapping, formatted or minified XML and whether to include the XML declaration.
  5. Select Convert to XML to parse the JSON and generate XML output.
  6. Review warnings for sanitized keys, then copy or download the generated .xml file.
Why you’ll love it

Benefits

Local JSON parsing

JSON text and files are parsed in the browser without uploading content to ToolMint.

Configurable XML output

Choose the root element, array item element, formatted or minified output and XML declaration.

Optional attribute convention

Map @attributes objects and #text values into XML attributes and text content when your JSON uses that convention.

Safe element naming

Invalid XML element names are sanitized without silently losing the original JSON key.

In practice

Examples

  • Convert a JSON API example into XML for integration documentation.
  • Turn a test payload into XML for a service that accepts XML requests.
  • Create XML from a configuration snippet while preserving string values such as 00123.
  • Convert arrays into repeated item elements with a custom item name.
  • Map @attributes and #text into XML attributes and text content for convention-based test payloads.
  • Review sanitized JSON keys before sending XML into a strict downstream system.
Tips

Pro tips

  • Use valid JSON, not JavaScript object literal syntax.
  • Keep identifiers, dates and numeric-looking strings quoted in JSON if exact text matters.
  • Choose root and item names that match the XML names expected by your receiving system.
  • Enable the attribute convention only when your JSON intentionally uses @attributes and #text keys.
  • Review any data-original-key attributes because they indicate JSON keys that were not safe XML element names.
  • Use formatted XML for review and minified XML when you need compact output.
  • Use an XML schema-aware tool when a system requires namespaces, attributes or strict validation rules.
Watch out

Common mistakes to avoid

  • Pasting JSON with comments or trailing commas.
  • Using single quotes or unquoted property names from JavaScript examples.
  • Expecting plain JSON to generate XML namespaces or schema-specific attributes automatically.
  • Treating very large numeric IDs as numbers instead of strings.
  • Ignoring sanitized element names when JSON keys contain spaces, punctuation or leading numbers.
  • Expecting @attributes to become XML attributes when the attribute convention is disabled.
  • Expecting perfect JSON-to-XML-to-JSON round trips from a general-purpose mapping.

Frequently asked questions

Paste JSON into the editor or upload one .json file, validate the JSON if needed, choose XML options, then select Convert to XML. ToolMint generates XML locally in your browser.

Yes. You can choose or drag and drop one .json UTF-8 text file. The file content loads into the editor and is not uploaded to ToolMint servers.

Array values are wrapped in the configured array item element. The default item element name is item.

Yes. The root element field defaults to root. Blank names, XML declaration text and markup are rejected, and unsafe XML names are sanitized with a visible warning.

ToolMint sanitizes the element name and preserves the original JSON key in a data-original-key attribute so the key is not silently lost.

Yes, when the optional attribute convention is enabled. An @attributes object is mapped to XML attributes, and a #text value is mapped to text content. Normal JSON is not forced into this convention.

Null values become empty XML elements by default. You can also output literal null text or omit null elements, but omitting null values changes the XML structure.

Yes. Enable the XML declaration option to include <?xml version="1.0" encoding="UTF-8"?> at the top of the generated XML.

No. JSON parsing, XML generation, preview, copying and downloads happen locally in your browser. Analytics do not include filenames, JSON content, object keys, values or XML output.

XML supports attributes, namespaces, comments, processing instructions and schema-specific behavior that plain JSON does not represent directly. A converter must choose a mapping, so perfect round trips are not guaranteed.

Sources

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