What is a XML file?
XML — tagged data
Use the format XML
A concrete example
Prepare a JSON from an XML exchange document.
Useful checks
Attributes, namespaces, and repeated elements require conventions. Ensure that no useful structure has been flattened.
Choose a conversion
Keep the original and open the result in the software or on the device that will need to use it.
Your questions about this format
Why does my JSON change structure when converted to CSV?
CSV represents a table of rows and columns. JSON can contain objects and nested lists that do not transpose directly. Convert a copy, check how the fields are represented, and keep the JSON if your usage requires retaining its entire structure.
How can one avoid losing the leading zeros in identifiers?
When opening the CSV in a spreadsheet, import the identifier columns as text. Automatic opening can turn 00123 into 123. Also check the dates and decimal separators before re-saving.
Can I convert a file containing secrets?
Remove passwords, API keys, and other secrets before sending a sample to the service or support. File processing is done online. For data that must not leave your device, use a suitable local tool.
Why aren't all outputs offered?
Formats are not interchangeable in all cases. ConvertLab displays the conversions from its catalog; renaming an extension does not change the content. Specialized outputs like certain XML exports or spreadsheets are identified as NoLimit.
What is it?
XML structures data using tags, much like HTML, but without a fixed vocabulary: you define your own tags and their meaning.
It can describe highly complex structures, validate them against a schema, and guarantee that a file conforms to the expected format — a level of rigor that JSON doesn't offer natively.
History & origin
The W3C published the XML specification in 1998, at a time when it was expected to become the universal format for all data exchange.
That prophecy never came true for web interfaces, where JSON overtook it thanks to its lighter weight. But XML is far from dead: it forms the backbone of DOCX files, SVG, RSS feeds, and countless enterprise systems.
Why it is useful
Strict schema validation, namespaces to avoid naming collisions, and the ability to describe arbitrarily complex structures.
It's exceptionally well supported by tooling and remains indispensable in large-scale systems.
Limits & drawbacks
Its verbosity is legendary: every piece of data is wrapped in opening and closing tags, which can easily triple file size compared to JSON.
It's tedious to read and write by hand.
Practical tips
To work with XML data in a modern application, convert it to JSON: you'll cut the file size and simplify processing.
One caveat: XML attributes have no direct equivalent in JSON, so automatic conversion can produce an unexpected structure. Always check the result.
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