Free JSON to XML Converter – Convert JSON to Formatted XML

How JSON to XML Conversion Works

JSON and XML both carry structured data, but they think about it differently. JSON has objects, arrays and typed scalars. XML has elements, attributes and text, with no native concept of a list or a number. This converter reads valid JSON and produces well-formed indented XML, turning each key into an element and each nested object into a nested element. The usual reason to need it is an integration boundary: your service speaks JSON and the system on the other side, a SOAP endpoint, a bank gateway, a government filing API or a decade-old enterprise product, insists on XML. Writing those tags by hand for anything past a few fields is tedious and easy to get wrong. The mapping follows predictable rules. Your JSON is parsed first, so invalid input is reported rather than converted, then the structure is walked and written out. An object key becomes an element name with the value as its content. A nested object becomes a nested element indented one level. An array becomes repeated sibling elements sharing the same tag name, because XML has no array type and repetition is the conventional way to express a list. Scalars are written as text, which means type information is lost: the JSON number 3 and the JSON string 3 both become the same text node, and any consumer must rely on a schema to know which was intended. A single root element is required by XML, so if your JSON is an array at the top level a wrapping root element is added around the repeated items. Work through a small order. The JSON has an id of 1041, a customer object containing a name of Asha Nair and a city of Pune, and an items array holding the two strings pen and notebook. The XML output opens with an order root, then an id element containing 1041, then a customer element with name and city children indented one level deeper, then two separate item elements, each holding one of the array values. Notice what changed: the array became two sibling tags rather than any kind of list syntax, and the numeric id is now indistinguishable from a string. If a value contained an ampersand or an angle bracket it would be escaped to amp, lt or gt so the document stays well-formed. Practical situations. A developer integrating a payment gateway that only accepts XML builds the request body from an internal JSON object. A team publishing an RSS feed generates the XML from the JSON their CMS already returns. Someone submitting a compliance report to a regulator whose portal requires XML converts the JSON their system produces. A tester inspecting how a JSON structure will map onto an XSD checks the element nesting before writing the schema. Each case shares a shape: JSON is the internal truth and XML is the export format. Two things to plan for. XML element names have rules JSON keys do not: they cannot begin with a digit, cannot contain spaces, and are case-sensitive, so a JSON key like 1st place or user name needs renaming before it can become a valid tag. That is the most common cause of output a strict parser rejects. The second is that the conversion produces well-formed XML but not necessarily valid XML for your target: a SOAP service will expect specific namespaces, a specific envelope and a specific element order, and none of that can be inferred from your JSON. Treat the output as the data layer and add the required wrapper and namespaces yourself. Parsing runs in your browser, so internal payloads are never uploaded.

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