XML to JSON

Convert XML documents, tags, and attributes into clean, structured JSON. 100% private and processed locally in your browser.

100% Client-Side Safe
• Your data is processed locally in your browser and never uploaded.

XML Input

JSON Output

Conversion Settings

ENGINE ARCHITECTURE & SPECIFICATION

XML to JSON Transformation Pipeline

A deterministic, browser-native transformation engine designed to convert XML documents, attributes, repeating tag sequences, and CDATA blocks into clean, RFC 8259 compliant JSON payloads.

🛡️

Zero-Knowledge Browser Sandboxing

100% Client-Side • 0 Telemetry

The FreeJSONtoCSV XML to JSON Converter parses complex XML schemas, SOAP envelopes, and RSS data feeds into JavaScript Object Notation inside an isolated WebWorker sandbox. Zero payloads leave your machine or travel over the network, guaranteeing air-gapped data residency for confidential enterprise records, database exports, and proprietary schemas.

Sub-Millisecond

Asynchronous tokenization and AST parsing in a dedicated worker.

Air-Gapped Privacy

Zero server ingestion, database logs, or external network requests.

RFC 8259 Spec

Strict compliance with standard JSON data format specifications.

50MB+ Safe Buffer

Optimized memory buffers for massive XML datasets and feeds.

Conversion Lifecycle

Conversion Lifecycle & Execution Pipeline

4-Stage WebWorker
01Tokenize

Lexical & Prolog Scan

Strips XML declarations, handles DOCTYPE headers, decodes comments, and identifies element boundary tags.

02AST Parse

Tree & Attributes

Builds nested hierarchical stack, maps attributes (@id), and resolves mixed #text nodes.

03Coerce

Type & CDATA Flow

Infers numeric, boolean, and null literals, decodes XML entities (&), and extracts CDATA blocks.

04Serialize

RFC 8259 JSON

Emits formatted or minified JSON with repeating sibling array grouping, ready for export or API ingestion.

Practical Code Reference

Real-World Manifest Transformations

Interactive Gallery

See how real-world XML documents, attributes, and CDATA blocks translate cleanly into structured JSON.

1. Organization & Employee Directory

Preview

Nested XML elements, attributes, and repeating sibling tags parsed into structured JSON objects and arrays.

company.xmlXML Input
<?xml version="1.0" encoding="UTF-8"?>
<department id="ENG-01">
  <name>Platform Engineering</name>
  <employees>
    <employee>
      <id>101</id>
      <name>Sarah Jenkins</name>
      <role>Lead Architect</role>
      <active>true</active>
    </employee>
  </employees>
</department>
company.jsonJSON Output
{
  "department": {
    "@id": "ENG-01",
    "name": "Platform Engineering",
    "employees": {
      "employee": [
        {
          "id": 101,
          "name": "Sarah Jenkins",
          "role": "Lead Architect",
          "active": true
        }
      ]
    }
  }
}

2. E-Commerce Order & Attribute Mapping

Preview

XML element attributes converted cleanly to prefixed JSON properties (@id, @currency) and mixed text node.

order.xmlXML Input
<?xml version="1.0" encoding="UTF-8"?>
<order id="ORD-9821" currency="USD">
  <customer>Apex Systems</customer>
  <total>249.99</total>
  Priority Overnight Delivery
</order>
order.jsonJSON Output
{
  "order": {
    "@id": "ORD-9821",
    "@currency": "USD",
    "customer": "Apex Systems",
    "total": 249.99,
    "#text": "Priority Overnight Delivery"
  }
}

3. CDATA Extraction & Entity Unwrapping

Preview

HTML payloads and rich markup inside CDATA extracted cleanly into standard JSON string literals.

article.xmlXML Input
<?xml version="1.0" encoding="UTF-8"?>
<article>
  <title>XML &amp; JSON Guide</title>
  <content><![CDATA[<p>Learn <strong>XML</strong> logic.</p>]]></content>
</article>
article.jsonJSON Output
{
  "article": {
    "title": "XML & JSON Guide",
    "content": "<p>Learn <strong>XML</strong> logic.</p>"
  }
}
Data Type Reference

XML vs JSON Structural Mapping Matrix

W3C XML & RFC 8259 Standard
XML ConstructJSON EquivalentMapping Mechanism
Element <name>Alice</name>{"name": "Alice"}Tag name becomes object key; enclosed text content is auto-coerced into string or number.
Repeating Tag <item>1</item>"item": [1, 2]Multiple sibling elements sharing the same tag name are automatically grouped into an array.
Attribute <user id="101"/>{"@id": 101}Attribute names are prefixed with configured key prefix (@, _) on the enclosing object.
Mixed Content <p c="USD">25</p>{"@c": "USD", "#text": 25}Elements with both attributes and text preserve inner text under the #text property.
Empty Element <val/>null / "" / {}Empty element tags map to explicit null, empty string, or empty object based on settings.
Technical Specifications

Enterprise Best Practices & Specifications

XML & JSON Standard
🏷️

Namespace & Prefix Stripping

SOAP web services and XML schemas often use XML namespaces (e.g. <soap:Envelope>). The converter can optionally strip prefixes to produce clean, developer-friendly JSON keys like "Envelope".

🔢

Automatic Type Coercion

All XML values are stored as character sequences. Our engine evaluates numbers, floats, booleans (true/false), and null keywords into native JSON types with zero manual parsing.

⚡

Isolated WebWorker Performance

All XML lexical analysis, DOM tree construction, and JSON serialization execute in a background Web Worker thread. This ensures complete UI responsiveness with zero Interaction to Next Paint (INP) latency.

📑

Sibling Array Aggregation

In XML, collections are represented by repeating sibling tags. Our converter automatically identifies and aggregates identically named sibling tags into standard JSON arrays.

FAQ

Frequently Asked Questions

Find instant, verified answers to common questions about data conversion, syntax formatting, encoding, and offline privacy.

XML ↔ JSONHow to convert XML to JSON?

To convert XML to JSON: 1. Open the XML to JSON Converter. 2. Paste your XML markup or upload an .xml file. 3. The converter parses the XML DOM tree, groups repeated child elements into JSON arrays, maps attributes using prefixes (like @id), and converts text nodes. 4. Download the generated .json file or copy it directly to your clipboard.

XML ↔ JSONHow to convert JSON to XML?

To convert JSON to XML: 1. Open the JSON to XML Converter. 2. Paste your JSON string or upload a .json file. 3. Specify your preferred root element name (default <root>) and array item tag (default <item>). 4. The tool generates well-formed W3C XML with optional CDATA wrapping and XML declarations, ready for download.

XML ↔ JSONWhen to use JSON vs XML?

Use JSON for modern web and mobile applications, RESTful APIs, Single-Page Applications (React, Vue, Astro), and microservices because it is lightweight, faster to parse, and native to JavaScript. Use XML when you need strict schema validation via XSD, document markup with mixed text and tags (like DocBook or XHTML), enterprise SOAP web services, or advanced transformations using XSLT and XPath.

XML ↔ JSONHow to convert XML to JSON in Java?

In Java, you can convert XML to JSON using the org.json library: JSONObject jsonObj = XML.toJSONObject(xmlString); String json = jsonObj.toString(4);. Alternatively, using Jackson: XmlMapper xmlMapper = new XmlMapper(); JsonNode node = xmlMapper.readTree(xmlFile); ObjectMapper jsonMapper = new ObjectMapper(); String json = jsonMapper.writerWithDefaultPrettyPrinter().writeValueAsString(node);.

XML ↔ JSONWhen to use XML vs JSON?

Use XML when working with legacy enterprise systems (banking, healthcare HL7/FHIR, telecommunications), complex hierarchical document publishing, or protocols requiring digital signatures (XML-DSig) and metadata attributes on elements. Choose JSON when minimizing network payload size, improving mobile battery and parsing performance, and building modern cloud-native REST/GraphQL architectures.

XML ↔ JSONHow to convert JSON to XML in Spring Boot?

In Spring Boot, add the jackson-dataformat-xml dependency to your pom.xml or build.gradle. In your controller: @GetMapping(value = "/api/data", produces = { MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE }). Spring Boot will automatically serialize your Java DTO into XML or JSON based on the incoming HTTP Accept request header.

XML ↔ JSONHow do you convert XML to JSON?

You can convert XML to JSON instantly using FreeJSONtoCSV's online converter. It parses XML elements, nested tags, attributes, and CDATA blocks into standard RFC 8259 JSON objects entirely within your browser Web Worker, ensuring high throughput and total privacy with no server transmissions.

XML ↔ JSONHow to convert JSON to XML in a REST API?

In a REST API, you can convert JSON to XML by parsing the incoming JSON payload into an internal object or dictionary, setting the HTTP response Content-Type: application/xml header, and serializing the object into XML using libraries like xmltodict / dicttoxml (Python), xml2js (Node.js), or XmlMapper (Java).

XML ↔ JSONHow to convert XML into JSON?

To convert XML into JSON, parse the XML hierarchy into a Document Object Model (DOM), transform element nodes into dictionary keys, convert repeating sibling elements into arrays, and store attributes under prefixed keys (e.g. @attr). Our XML to JSON Converter automates this entire pipeline in real time.

XML ↔ JSONHow to convert JSON to XML online?

To convert JSON to XML online: Visit the JSON to XML Converter on FreeJSONtoCSV. Paste your JSON payload into the editor. The tool immediately transforms keys and arrays into formatted XML markup with custom root tags and indentation. Download the generated .xml file for free with no file size limitations.