Bridge legacy XML feeds and modern JSON APIs without leaving your browser
Enterprise integrations still ship SOAP envelopes, HL7-ish exports and vendor XML configs while new services speak JSON. Converting between the two by hand is tedious and error-prone when namespaces, attributes and repeated elements do not map one-to-one to object keys. This converter transforms pasted JSON to XML and XML back to JSON entirely in your browser tab so partner payloads with field names you cannot redact never traverse a third-party upload form. Use it when onboarding a supplier file, prototyping a BFF adapter or generating sample XML for a regression test from an OpenAPI example.
Conversion workflow
- Validate JSON syntax or skim XML for a single root element.
- Paste source text and choose the direction you need.
- Inspect attribute handling and repeated tags in the output.
- Format JSON results and diff against a baseline before you commit fixtures.
Mapping expectations
JSON objects become nested elements; arrays typically become repeated sibling tags unless your sample used a wrapper convention. Attributes on XML elements may appear as special keys in JSON depending on direction — always eyeball financial and healthcare samples where a misplaced attribute changes meaning. Large documents may slow the tab because parsing is synchronous; work on excerpts during interactive exploration.
Stabilize JSON before you publish XML
Prettify API samples with the JSON Formatter, confirm syntax in the JSON Validator and codify expected shapes with the JSON Schema Generator when the JSON side is canonical. Compare migration outputs in JSON Diff after you convert back from XML so you catch drift in nested paths. When tabular data started as CSV, use the CSV ⇄ JSON Converter first so column semantics are explicit before you wrap rows in XML.
Production checklist
Document namespace prefixes your partner requires rather than relying on auto-generated defaults. Redact secrets in both directions even though processing stays local. Keep golden XML and JSON fixtures paired in git so the next engineer can reproduce conversion without guessing which paste was authoritative. For YAML configs, convert to JSON with the YAML ⇄ JSON Converter before XML work when that matches what your runtime actually parses.
Attributes, arrays and mixed content
XML attributes map to JSON keys with an @ prefix in many converters; confirm your consumer expects that convention before you commit configs. Mixed text nodes and elements may flatten differently than hand-authored JSON. Round-trip once with a small sample that includes lists, attributes and empty tags so surprises appear in staging rather than production deploys.
Type fidelity across the round trip
XML is largely stringly-typed: a number, a boolean and a date all look like text inside a tag, while JSON distinguishes numbers, booleans and null natively. Converting XML to JSON often produces strings where your API expects real numbers, so cast explicitly in the consumer rather than trusting the converter to guess. Going the other way, JSON nulls and empty arrays have no single canonical XML form, so agree with your partner on whether an absent value becomes an empty element, a missing element or an attribute. Pin these decisions in a shared fixture so a future migration does not silently change a field from a string to an integer.