XML ↔ JSON Converter
Convert between XML and JSON in both directions with attribute preservation and configurable formatting
Interactive tool
Input
No data to convert
Paste XML or JSON. Direction auto-detected based on input
What is an XML to JSON Converter?
A bidirectional converter that turns XML into JSON for use in modern apps and APIs, and JSON into XML for legacy systems and SOAP-style integrations. Attributes are preserved as keys with a configurable prefix, and the conversion is reversible for typical document shapes.
How to Use This XML to JSON Converter
- 1Paste XML or JSON into the input area
- 2Leave Auto-detect on, or pick the direction explicitly
- 3Review the converted output and statistics
- 4Use "Use as input" to swap and convert back
- 5Copy or download the result
Key features
Bidirectional Conversion
XML to JSON and JSON to XML, both done with the same tool
Attribute Preservation
XML attributes are mapped to keys with the @_ prefix and survive round-trip conversion
Auto-Detection
Direction is detected from input shape, so you rarely need to pick manually
Round-Trip Verification
Click "Use as input" to verify output converts back to your original
Type Inference
Numbers, booleans, and other primitives are typed in the JSON output
Pretty-Printed Output
Both XML and JSON output are formatted for readability
Size Comparison
Byte counts make it easy to see how the format change affects payload size
100% Private
Conversion runs in your browser. Nothing is uploaded
Why Convert Between XML and JSON?
Modern apps prefer JSON; many enterprise systems still emit XML. Converting between the two unlocks interoperability without rewriting either side. Use it to feed XML responses to JavaScript apps, transform configuration files between formats, or prepare bridge code that talks to both new and legacy services.
Common use cases
- Transforming SOAP XML responses into JSON for frontend consumption
- Migrating XML configuration files to JSON formats
- Bridging legacy systems with modern APIs
- Generating XML payloads from JSON test fixtures
- Auditing XML structures by reviewing the JSON projection
- Comparing data shapes across format-disagreeing systems
- Preparing JSON responses for systems that expect XML
- Documentation pipelines that convert XML to JSON for richer rendering
Attribute Mapping
XML attributes have no native JSON equivalent. The converter encodes them as keys prefixed with @_. For example, <book id="1"> becomes {"book": {"@_id": "1"}}. JSON keys with the @_ prefix become attributes when converting back to XML, preserving the round-trip.
Mixed Content Limitations
XML supports mixed content (text and elements interleaved). JSON cannot represent this directly. The converter approximates with a #text key, which works for most documents but may produce surprising results for heavily mixed-content XML like prose with inline tags.
Tips & best practices
Round-trip your data
Use the "Use as input" button to convert output back. If round-trip differs from original, your XML uses features that map imperfectly
Stick with auto-detect
Auto-detect is reliable for typical inputs. Only switch when you want to force a direction for testing
Preserve attributes consciously
Review the @_ prefix in JSON output. If you do not need attributes, simplify your JSON consumer accordingly
Watch byte size
XML is usually larger than JSON for the same data. Use byte counts to plan capacity for storage or transmission
Validate before converting
If conversion fails or output looks off, validate input with the dedicated XML or JSON formatter first
Privacy & security
This XML to JSON converter runs entirely in your web browser using the fast-xml-parser library. Data is never uploaded to any server, stored anywhere, or transmitted. All conversion happens locally on your device.
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Frequently Asked Questions
How are XML attributes converted to JSON?
XML attributes become JSON keys prefixed with @_. For example, <book id="1"> becomes {"book": {"@_id": "1"}}. When converting JSON back to XML, keys with the @_ prefix are restored as attributes.
Why is the round-trip output not byte-identical to my input?
Whitespace, attribute order, and self-closing tag style may change during conversion even though the data is preserved. Use the dedicated XML formatter to compare semantic equivalence.
What happens to mixed content (text and elements interleaved)?
JSON cannot directly represent mixed content. The converter approximates by joining text into a #text key. For prose-heavy XML with inline tags, expect some structural simplification.
Can I convert SOAP envelopes?
Yes. SOAP is just XML, so XML to JSON conversion produces a usable JSON projection. Namespaces are preserved as part of element names. For SOAP-specific extraction, you may want to post-process the JSON to drop envelope and body wrappers.
Does the converter validate input?
Input is parsed and any syntax errors stop conversion with a clear error message. For deeper XML well-formedness checks or JSON schema validation, use the dedicated formatter and validator tools.
Is my data uploaded anywhere?
No. The converter runs entirely in your browser using the fast-xml-parser library. Data is never uploaded, stored, or transmitted to any server.