JSON to XML Converter — Free Bulk JSON to XML Tool

JSON to XML Converter — Transform JSON Data into Well-Formed XML

The JSON to XML Converter is a free, privacy-first tool that transforms JSON data into clean, well-formed XML documents directly in your browser. Whether you're integrating with legacy systems that require XML, building SOAP API requests, creating configuration files, or simply need to convert data formats, this tool handles the conversion with full control over the output structure.

Unlike server-based conversion tools that require uploading sensitive data, this converter uses the browser's native JSON parser and custom XML generation to process everything locally. Your JSON data never leaves your device, making it ideal for API keys, configuration data, financial records, and any other sensitive content.

Key Features

• Bulk File Support — Drag and drop multiple JSON files onto the upload zone for batch conversion. Each file is processed independently with its own result card, download button, and conversion statistics. Download all results as a single ZIP archive.
• Custom Root and Item Tags — Configure the root element tag name and the tag name used for array items. This gives you full control over the XML structure without post-processing.
• Flexible Indentation — Choose between 2 spaces (default), 4 spaces, Tab characters, or no indentation for compact, minified output. The tool produces clean, readable XML at any indentation level.
• XML Declaration — Toggle the XML declaration header () on or off. Enable it for standalone XML documents, disable it for XML fragments to be embedded in larger documents.
• CDATA Support — Optionally wrap all text values in CDATA sections. This is essential when integrating with systems that expect CDATA-wrapped content or when dealing with data containing many special characters.
• Smart Tag Sanitization — JSON keys that are invalid as XML tag names (containing spaces, special characters, or starting with digits) are automatically sanitized with underscores while preserving readability.
• Null Handling — JSON null values are converted to self-closing XML elements (e.g., ), which is the standard XML representation of empty or absent values.
• Nested Object Support — Deeply nested JSON objects are converted to corresponding nested XML elements, preserving the full hierarchical structure of your data.
• Array Flattening — JSON arrays are converted to repeated sibling elements, which is the standard XML pattern for representing ordered collections.
• Real-Time Preview — The XML output appears immediately in the output pane with syntax-ready formatting, allowing you to review the result before downloading.

How the Conversion Works (Technical)

The JSON to XML conversion follows a recursive algorithm that maps JSON's data model to XML's element-based structure:

1. JSON Parsing — The input is parsed using the browser's native JSON.parse() method, which validates the JSON syntax and creates a JavaScript object tree.
2. Type Detection — Each value is classified as one of: primitive (string, number, boolean), null, array, or object. Each type maps to a specific XML pattern.
3. XML Generation — Primitives become text content within their parent element. Objects become nested elements where each key becomes a child element tag. Arrays produce repeated sibling elements using the configured item tag. Null values produce self-closing elements.
4. Tag Sanitization — JSON keys are processed to ensure valid XML tag names: non-alphanumeric characters (except hyphens and underscores) are replaced with underscores, and keys starting with digits receive an underscore prefix.
5. Output Assembly — The XML string is assembled with proper indentation, optional XML declaration header, and either CDATA wrapping or XML entity escaping for special characters.

JSON to XML Mapping Rules

Understanding how JSON types map to XML elements helps you predict and control the output:

• JSON Object → Nested Elements — Each key-value pair becomes a child element. {"name": "Alice"} becomes <name>Alice</name>.
• JSON Array → Repeated Elements — Each array item becomes a repeated element using the item tag. [1, 2, 3] becomes three <item> elements.
• JSON String → Text Content — String values become the text content of their parent element, with special characters properly escaped.
• JSON Number/Boolean → Text Content — Numbers and booleans are converted to their string representation as element content.
• JSON null → Self-Closing Element — Null values produce self-closing tags like <field/>.
• Nested Structures — Deeply nested objects and arrays are recursively converted, preserving the full hierarchy.

Use Cases

• Legacy System Integration — Many enterprise systems, government APIs, and legacy applications still require XML input. Convert modern JSON API responses to XML format for seamless integration.
• SOAP API Development — When building or testing SOAP web services, quickly convert JSON test data into XML request bodies.
• Configuration File Creation — Generate XML configuration files from JSON data sources. Useful for Java-based applications, Maven POMs, and Android manifests.
• Data Migration — Convert JSON database exports to XML format for import into systems that only accept XML, such as older CMS platforms and enterprise databases.
• Documentation — Generate XML examples from JSON data for API documentation, technical specifications, and integration guides.
• RSS/Atom Feed Generation — Convert JSON content data into XML-based syndication formats.

Tips and Best Practices

• Set meaningful tag names — Change the root and item tag names to match your target XML schema. For employee data, use 'employees' as root and 'employee' as item tag.
• Use CDATA for HTML content — If your JSON contains HTML strings, enable CDATA wrapping to avoid escaping issues and preserve the HTML as-is within the XML.
• Validate the output — After conversion, verify the XML is valid by checking for proper nesting, matching tags, and correct encoding.
• Choose appropriate indentation — Use 2 or 4 spaces for human-readable XML. Use 'None' for machine-to-machine communication where file size matters.

Privacy and Security

The JSON to XML Converter processes all data entirely in your browser. No JSON content is transmitted to any server — the conversion uses native JavaScript JSON parsing and string concatenation. This makes it safe for converting sensitive JSON data including API credentials, configuration secrets, personal information, and proprietary business data. The tool works completely offline once the page is loaded.

Browser Compatibility

The JSON to XML Converter works in all modern browsers including Chrome, Firefox, Edge, Safari, and Opera. It also works on mobile browsers (iOS Safari, Chrome for Android). The tool uses standard Web APIs (JSON.parse, Blob, URL.createObjectURL) that are supported in all browsers released since 2015.