How to convert an Array to an XML file in JavaScript?
The XML string is saved as a file. Iterate through the array, convert each object into
- element, convert the key value into child elements, and special characters need to be escaped; finally use the Blob API to trigger the download. For example: arrayToXml(data) generates a string, downloadXmlFile(xml, 'file.xml') implements download.
To convert an Array to an XML file in JavaScript, you need to generate a well-formed XML string from the array data and then optionally save it as a file. This process involves traversing the array and building XML markup using string concatenation or a library. Below are practical approaches to achieve this.
Convert Array to XML String
If your array contains objects or simple values, you can loop through it and build an XML structure manually. Here's how to do it for an array of objects:
- Create a root element (eg,
) to wrap all array entries - Iterate over each item in the array
- For each object, create an
- tag with child elements matching the keys
- Escape special characters like &, to ensure valid XML
Example code:
function arrayToXml(array) {let xml = '
array.forEach(item => {
if (typeof item === 'object' && !Array.isArray(item)) {
xml = '
Object.keys(item).forEach(key => {
const value = String(item[key])
.replace(/&/g, '&')
.replace(/, ' .replace(/g, '>')
.replace(/"/g, '"')
.replace(/'/g, ''');
xml = `${value}${key}>`;
});
xml = '
} else {
xml = `
}
});
xml = '
return xml;
}
Save XML String as a File in Browser
After generating the XML string, you can trigger a download in the browser using the Blob API and URL.createObjectURL:
function downloadXmlFile(xmlString, filename = 'data.xml') {const blob = new Blob([xmlString], { type: 'text/xml' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = filename;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
Usage example:
const data = [{ name: 'Alice', age: 28 },
{ name: 'Bob', age: 32 }
];
const xmlOutput = arrayToXml(data);
downloadXmlFile(xmlOutput, 'users.xml');
Using a Library (Optional)
If you're handling complex data or want better control, consider using a library like xml-js or js2xmlparser . These help avoid manual escaping and support attributes, namespaces, etc.
With js2xmlparser :
npm install js2xmlparser const js2xmlparser = require("js2xmlparser");const xml = js2xmlparser.parse("items", { item: data });
downloadXmlFile(xml, "output.xml");
Basically just convert the array into structured XML text, handle character escaping, and use the browser's file-saving mechanism. Works reliably across modern environments.
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