XML to TOML Converter
Convert XML documents to TOML format with automatic handling of attributes, nested elements, and arrays. Perfect for migrating configuration files to modern TOML-based systems with validation and formatting options.
TOML Format Limitations
TOML does not support null values and requires homogeneous arrays (all same type). These constraints are handled automatically with recommended settings enabled.
Conversion Options
Remove null values (required for TOML)
Improve readability with spacing
Order keys A-Z for consistency
Remove root wrapper for cleaner TOML
Merge attributes with child elements
Recommended Settings
XML to TOML Conversion Best Practices
- •Enable 'Skip Null Values' - TOML does not support null, this option is required
- •Use 'Flatten Attributes' to merge XML attributes into TOML tables for cleaner output
- •Enable 'Unwrap Root' if your XML root is just a container with no meaningful data
- •TOML arrays must be homogeneous (same type) - tool handles this automatically
- •TOML is ideal for configuration files but has structural limitations compared to XML
Common Use Cases
- •Config migration: Convert XML configs to TOML for Rust, Python, or Go projects
- •Modernization: Replace verbose XML settings with readable TOML configuration files
- •Version control: TOML produces cleaner diffs than XML for Git-based config management
- •Simplification: Convert complex XML to simpler TOML where full XML flexibility isn't needed
- •Tool compatibility: Migrate to tools that prefer or require TOML over XML (Cargo, Poetry)
Pro Tips
- •Paste XML and it auto-validates - conversion triggers when valid XML detected
- •Blue info banner explains TOML limitations (null values, homogeneous arrays)
- •Repeated XML elements become TOML arrays automatically
- •Simple text elements are unwrapped for cleaner TOML output
Most Popular
Most users enable skip nulls, blank lines, unwrap root, and flatten attributes
When to Use This Tool
Convert XML configuration files (Maven pom.xml, Spring beans.xml, .csproj) to modern TOML format for Rust (Cargo.toml), Python (pyproject.toml), or Go projects. TOML offers better readability, simpler syntax, and native support in modern tools. Perfect for modernizing legacy config systems or standardizing multi-language project configurations.
Recommended: DevOps & Migration
Transform XML application settings to TOML for deployment configuration, feature flags, or environment-specific settings. TOML's clear key-value structure and section support make it ideal for app configs. Use for Docker Compose alternatives, Kubernetes ConfigMaps, or any system where human-readable config files are preferred over verbose XML.
Recommended: Application Config
Simplify complex XML data structures to TOML for easier editing and version control. TOML's minimal syntax reduces noise and improves diff readability in Git. Convert XML metadata, catalog files, or structured data exports to TOML for lightweight data storage where XML's flexibility isn't needed but structure is important.
Recommended: Data Management
How It Works
Paste or type your XML document into the input field
Tool automatically validates XML using browser's DOMParser API
Green checkmark appears when XML validation passes successfully
Click 'Convert to TOML' to start conversion
xml-js library parses XML into JavaScript object structure with compact mode
XML attributes are flattened into parent object (or kept separate if option disabled)
Simple text elements (<tag>text</tag>) are unwrapped to direct values
Repeated XML elements detected and converted to TOML arrays
Null and undefined values are removed (required for TOML compatibility)
Element names sanitized to valid TOML keys (letters, numbers, _, -)
Root element unwrapped if option enabled for cleaner configuration files
Keys sorted alphabetically if option enabled for consistent ordering
json2toml library generates TOML output with proper formatting and sections
Copy TOML to clipboard or download as .toml file ready to use
All processing happens in browser - your XML never leaves your device
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side JavaScript with xml-js and json2toml libraries, browser's native DOMParser for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
Why doesn't TOML support null values?
TOML was designed for configuration files where null/undefined values are ambiguous and error-prone. Instead of null, TOML uses the absence of a key to indicate no value. The 'Skip Null Values' option (enabled by default) automatically removes null values from the conversion, which is the recommended approach for TOML compatibility.
How are XML attributes converted to TOML?
With 'Flatten Attributes' enabled (recommended), XML attributes are merged into the same TOML table as child elements. For example, <user id='123'><name>John</name></user> becomes [user] with id='123' and name='John'. This creates cleaner TOML. Alternatively, attributes can be grouped in a separate 'attributes' table for preservation.
What happens to repeated XML elements?
Repeated XML elements (multiple children with the same name) are converted to TOML arrays. Simple repeated elements become value arrays like tags = ['xml', 'toml']. Complex repeated elements become arrays of tables using [[section.name]] syntax, which is TOML's way of representing arrays of objects.
Can XML with mixed content be converted to TOML?
Partially. XML elements with both text content and child elements (mixed content) cannot be perfectly represented in TOML. The tool stores text as a 'value' field alongside other fields. For simple elements with only text and no children, the text is unwrapped directly as the value, creating cleaner TOML output.
Why would I unwrap the root element?
Unwrapping removes the XML root element name from TOML output, creating cleaner configuration files. For example, <config><database>...</database></config> with unwrap becomes [database] directly instead of [config.database]. This is useful when the root element is just a wrapper with no meaningful data.
What XML structures cannot be converted to TOML?
TOML has limitations: (1) No null values (solved by skipping them), (2) Arrays must have homogeneous types (all same type), (3) Root must be an object not an array, (4) No mixed-content text+elements without workarounds. The tool handles most cases automatically but may fail on highly complex or irregular XML structures.
How are XML element names sanitized for TOML?
TOML keys can only contain letters, numbers, underscores, and hyphens. XML elements with spaces or special characters are automatically sanitized by replacing invalid characters with underscores. For example, <my-element> stays my-element (valid), but <my element> becomes my_element (sanitized).
Is my XML data secure using this tool?
Yes! All XML parsing and TOML conversion happens entirely in your browser using JavaScript, xml-js library, and json2toml. Your XML is never sent to any server, uploaded anywhere, or stored remotely. Everything runs 100% locally client-side, ensuring complete privacy for sensitive XML documents like configuration files or proprietary data.