JSON to XML Converter — Free Online JSON→XML Tool

How to use

1. Paste or type your JSON into the left box — a sample is already loaded on first visit.
2. The right side updates live as you type (debounced ~250 ms), or press the Convert button.
3. Use Copy to copy the XML to your clipboard, or Download .xml to save it locally.
4. The left input is remembered in your browser, so you can come back and keep editing.

What is it

JSON and XML are both text formats for structured data. JSON is leaner and is the default for modern APIs; XML is more verbose but carries a strict schema (DTD / XSD) and is still widely used in enterprise systems, SOAP services, RSS feeds, office documents and configuration files. This tool parses your JSON with the built-in JSON.parse and rebuilds it as XML using fast-xml-parser, wrapping the whole object under a single root element so the output is always well-formed.

Notes & fun facts

A neat piece of trivia: XML is older than JSON by more than a decade. After W3C standardized it in 1998, XML quickly became the universal language of enterprise data exchange — SOAP APIs, RSS feeds, Office documents (.docx and .xlsx are essentially ZIP archives containing XML), SVG vector graphics, SVG icons, Android layout files, and Web.config files all live in XML. Its tags, attributes and namespaces made data structures rigorous to the point of being verbose, but that rigor let old systems talk to each other. JSON emerged in the early 2000s, championed by Douglas Crockford, and stripped away all the tags and attributes, using only curly braces, square brackets and quotes to describe data — about 60% smaller, and perfectly timed for the slow mobile networks of the 3G era. It quickly took over web APIs. But XML never disappeared — the Word documents you open, Excel spreadsheets, browser bookmark backups, RSS feeds, and ERP exports from enterprise systems are all XML underneath. The two formats are not enemies; they are two flavours of the same idea — "describe data with text" — JSON prioritizes lightness, XML prioritizes rigor. This tool is the bridge between them, letting you switch between the two worlds without getting bogged down in formatting details.

Origin & history

XML 1.0 was published by the W3C in February 1998 as a simplified subset of SGML (Standard Generalized Markup Language). SGML, in use since the 1960s for large technical documentation and aviation manuals, was extremely powerful but also extremely complex — far too heavy for ordinary websites. XML cut away 80% of SGML, keeping the core of "tags + attributes + nesting", so it could run inside web pages and emails. Throughout the 2000s, XML was the de facto standard for enterprise data exchange: SOAP, UDDI registries, XSLT transformations, XPath queries, RSS 1.0/2.0, and Atom feeds were all built on top of XML. JSON has a very different story: around 2001, Crockford discovered while working at Yahoo that JavaScript's native object literal was itself an extremely lightweight data format, so he formalized it as JSON (JavaScript Object Notation), submitted it to ECMA, and it became ECMA-404 in 2013. The rise of REST APIs and Node.js cemented JSON as the dominant web data format. But XML never died — it remains irreplaceable in enterprise backends, document formats and configuration files. The fast-xml-parser library used by this tool was open-sourced in 2018 under the MIT license: it is zero-dependency, ESM-friendly, and serializes JavaScript objects into XML entirely in the browser, with no server round-trip.

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