The ToolMint XML to JSON Converter lets you paste XML or upload one .xml file, validate the document, convert elements and attributes into JSON, preview the parsed structure, then copy or download formatted or minified JSON. Parsing and conversion happen locally in your browser, so XML content, uploaded files, element names, attributes, values and generated JSON are not uploaded to ToolMint servers.
This tool is designed for developers, technical writers, QA teams and data reviewers who need to inspect XML feeds, examples, configuration snippets or API responses in a JSON-friendly shape. It is useful for quick conversion and debugging, not for schema-aware enterprise XML transformation.
What XML to JSON conversion does
XML is a markup language built around elements, attributes, text nodes, namespaces, comments and processing instructions. JSON is a data format built around objects, arrays, strings, numbers, booleans and null values. Converting XML to JSON means parsing the XML tree and applying a documented mapping so the structure can be represented as JSON data.
ToolMint maps elements to object keys, repeated sibling elements to arrays, attributes to an @attributes object and text to #text where needed. CDATA is treated as text. Comments and processing instructions are ignored by default because standard JSON has no comment or processing-instruction syntax.
How to convert XML to JSON
Paste XML into the editor, choose one .xml file from your device, or drag and drop one XML 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 XML when you want syntax feedback before generating output. Use Convert to JSON when you want the parsed result. If validation succeeds, the JSON appears in a scrollable output panel. You can switch between formatted JSON with 2-space indentation and minified JSON, then copy the output or download converted-data.json.
How elements and attributes map
Each XML element becomes a JSON property using the element name. If an element has attributes and attribute preservation is enabled, those attributes are stored under the reserved key @attributes. For example, <user id="42"> becomes a user object with @attributes.id set to "42".
Text-only elements become string values when text-node inclusion is enabled. Empty elements use the selected empty-element representation: empty string, null or empty object. The default is empty string because it is simple and avoids implying that an empty element has structured child data.
Repeated elements and arrays
Repeated sibling elements become JSON arrays. For example, two <role> elements under the same parent become "role": ["admin", "editor"]. This avoids silently overwriting earlier values and keeps repeated XML structures visible in the JSON output.
The preview identifies repeated element names so you can review where arrays were created. If an XML document uses repeated elements for records, this mapping is usually what JSON consumers expect.
Namespaces and prefixes
Namespace-prefixed names such as <soap:Envelope> are preserved by default as keys like "soap:Envelope". Namespace declaration attributes such as xmlns:soap are preserved when attribute preservation is enabled. This makes the converted JSON easier to trace back to the original XML.
The converter does not resolve namespaces into external resources and does not perform namespace-aware transformations. If your workflow needs schema validation, XPath, XSLT or domain-specific namespace rules, use a dedicated XML toolchain.
CDATA, comments and processing instructions
CDATA sections are converted as text because their content is character data. XML comments are ignored, and processing instructions such as stylesheet references are ignored. This behavior is intentional: JSON cannot represent XML comments or processing instructions without inventing custom metadata.
If comments carry important human instructions, keep the original XML file or add notes manually after conversion. Do not expect XML comments to survive a JSON round trip.
Mixed-content limitations
Mixed content, such as <p>Hello <strong>world</strong> today.</p>, is difficult to represent as plain JSON because text and child elements have an order. Flattening that content into one string can lose structure, while grouping only child elements can lose text.
ToolMint detects mixed content and uses a cautious #content array where practical so text and child elements remain ordered. It also shows a warning. This is useful for inspection, but it is not a perfect round-trip representation for document-style XML.
XML security and external entities
The converter uses the browser's DOMParser with application/xml and checks parser errors before conversion. Parsed XML is not appended to the visible page DOM, is not rendered as active HTML and is serialized only as text JSON output.
For safety, ToolMint rejects DOCTYPE declarations and entity declarations before parsing. It does not fetch DTDs, resolve external URLs, evaluate XSLT, execute scripts or process executable content. XML with external entity behavior should be simplified or processed in a controlled XML environment.
Common conversion mistakes
One common mistake is assuming every XML document has an obvious JSON equivalent. XML can mix text and elements, use attributes for data, use namespaces, and include comments or processing instructions. A JSON converter must choose a mapping, and different tools can choose different reserved keys.
Another mistake is ignoring repeated siblings. If repeated elements are not converted to arrays, values can be overwritten. ToolMint preserves repeated siblings as arrays and shows repeated-element detection in the preview.
A third mistake is expecting DTDs or external entities to work in a browser converter. ToolMint rejects those features because this tool is designed for private local inspection and safe conversion, not external XML resource resolution.
Privacy and local processing
XML parsing, validation, preview, 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, setting changes, loading the example and reset. Analytics do not include XML content, filenames, tag names, attributes, values, namespace names, validation details or generated JSON.
Limitations
The file-size guidance is about 10 MB for this browser tool. This is practical guidance, not a universal XML limit. Very large XML files, deeply nested trees or large generated JSON output can be slow on older phones or low-memory devices.
The converter does not validate against an XML Schema or DTD, does not evaluate XPath or XSLT, does not preserve comments, and does not guarantee perfect XML-to-JSON-to-XML round trips. It is intentionally strict about DOCTYPE and entity declarations.
For JSON cleanup after conversion, use the JSON Formatter. For adjacent data-format workflows, use JSON to YAML Converter, YAML to JSON Converter, JSON to CSV Converter or CSV to JSON Converter. Use Text Diff Checker for comparing XML or JSON revisions, Base64 Encoder / Decoder for encoded payloads, URL Encoder / Decoder for URL-safe strings and Hash Generator for checksums. Browse more utilities in the Developer category.
Related ToolMint tools
Use JSON Formatter to inspect generated JSON, JSON to YAML Converter for YAML output, YAML to JSON Converter for YAML input, JSON to CSV Converter for table export and CSV to JSON Converter for spreadsheet-style data. 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.