Parsing & Generating XML in JavaScript

DOMParser, parseFromString, XMLSerializer, and XMLHttpRequest

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Modern web browsers provide native APIs to parse XML strings into live DOM Document trees and serialize DOM nodes back into XML text.

DOMParser and XMLSerializer APIs

DOMParser.parseFromString(xmlString, "application/xml"): Parses raw XML text into an XML Document object navigable with standard DOM queries (querySelector, getElementsByTagName).

XMLSerializer.serializeToString(xmlDoc): Serializes an XML Document or element node back into formatted XML text.

Checking for parsing errors: Inspect doc.querySelector("parsererror") to catch syntax errors gracefully.

Parsing XML in Modern JavaScript

Try It Yourself »

const xmlText = `<?xml version="1.0"?>
<user role="admin">
  <username>AdaLovelace</username>
  <email>ada@analytical.org</email>
</user>`;

// Parse XML string into DOM
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlText, "application/xml");

// Check for syntax errors
const parserError = xmlDoc.querySelector("parsererror");
if (parserError) {
  console.error("XML Parsing Error:", parserError.textContent);
} else {
  const username = xmlDoc.querySelector("username").textContent;
  const role = xmlDoc.documentElement.getAttribute("role");
  console.log(`User: ${username}, Role: ${role}`);
}

Standard DOM methods like textContent and getAttribute work seamlessly on XML documents.

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Test Yourself With Exercise

+15 XP

Which native browser API is used to convert an XML string into an in-memory XML DOM Document object?

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