XML to JSON Converter

Attributes have nowhere obvious to go

XML distinguishes attributes from child elements; JSON has only keys. The usual convention prefixes attribute keys with an at sign or collects them under a dedicated key, so an element with both attributes and children does not collide. Whichever convention a converter picks, the consumer has to know it, because there is no standard.

Repeated elements are ambiguous

Two sibling elements with the same name clearly become an array. One element with that name is ambiguous: it could be a single value or an array of one. A converter that guesses from the instance produces output whose shape changes depending on the data, which breaks consumers when a list happens to contain a single item. This is the single most common source of bugs in XML-to-JSON pipelines, and the fix is a schema, not better guessing.

Mixed content does not map

XML allows text and elements interleaved inside one element, which is how markup describes a paragraph containing bold words. JSON has no equivalent structure. Any conversion either flattens it, losing the interleaving, or produces a nested array representation so awkward it is barely usable. Document-oriented XML resists conversion in a way data-oriented XML does not.

Everything arrives as a string

XML text has no type. A converter must decide whether to coerce numeric-looking text to JSON numbers, and coercion causes the familiar damage: leading zeros vanish, long identifiers lose precision past 2^53-1, and values like true or NA get transformed. For identifiers and codes, keeping strings is safer.

Namespaces need a policy

Prefixed element names carry a namespace that JSON cannot express. Stripping prefixes is simplest and can collide two differently-namespaced elements onto one key. Keeping them makes keys unwieldy. Pick deliberately based on whether the source actually uses multiple namespaces.

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