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xml2js is a Node.js module that converts XML into JavaScript objects (and vice versa). It simplifies XML parsing by using pure JavaScript and supports both synchronous and asynchronous parsing. It’s a lightweight alternative to heavy DOM parsers. You can create one xml2js.Parser per file. That's the recommended one and is promised to always just work. You can call reset() on your parser object. You can hope everything goes well anyway. This behaviour is not guaranteed to work always, if ever.
XMLBuilder‑JS provides a fluent API for building XML in Node.js. You can create elemental structures via method chaining or object literals, include comments, attributes, and streams. It’s the baseline implementation, with xmlbuilder2 available now for modern DOM compliance, namespace handling, and format conversion.