How to Validate XML in JavaScript ? Last Updated : 17 Apr, 2024 Comments Improve Suggest changes Like Article Like Report Validation of XML is important for ensuring data integrity and adherence to XML standards in JavaScript. There are various approaches available in JavaScript using which validation of the XML can be done which are described as follows: Table of Content Using DOM ParserUsing Tag MatchingUsing DOM ParserIn this approach, we are using the DOMParser from the "xmldom" package in JavaScript to parse the provided XML string. The code checks for any parsing errors by looking for the presence of a <parsererror> element in the parsed XML document, indicating whether the XML is valid or not. Run the below command to install xmldom package: npm install xmldomExample: This example uses the DOM Parser to validate the XML in JavaScript. JavaScript const { DOMParser } = require("xmldom"); const xmlString = ` <geeks> <article> <title>Introduction to JavaScript</title> <author>GFG</author> <published>2024-01-01</published> </article> </geeks> `; const parser = new DOMParser(); try { const xmlDoc = parser .parseFromString(xmlString, "text/xml"); if (xmlDoc .getElementsByTagName("parsererror") .length > 0) { console.error( "XML parsing error:", xmlDoc .getElementsByTagName("parsererror")[0] ); } else { console.log("XML is valid."); } } catch (e) { console.error("Error while parsing XML:", e); } Output: XML is valid.Using RegexIn this approach, we are using a manual tag matching method to validate XML using regex. The function validateFn uses a stack to keep track of opening and closing tags, ensuring they are properly nested. If all tags are matched correctly and the stack is empty at the end, the XML is considered valid; otherwise, it's flagged as invalid. Example: To demonstrate using the Tag Matching to validate XML in JavaScript. JavaScript const xmlString = ` <geeks> <article> <title>Introduction to JavaScript</title> <author>GFG</author> <published>2024-01-01</published> </article> </geeks> `; function validateFn(xmlString) { let stack = []; const regex = /<([^>]+)>/g; let match; while ((match = regex .exec(xmlString)) !== null) { if (match[1] .charAt(0) === '/') { if (stack.length === 0 || stack.pop() !== match[1].slice(1)) { return false; } } else { stack.push(match[1]); } } return stack.length === 0; } if (validateFn(xmlString)) { console.log("XML is valid."); } else { console.log("XML is not valid."); } OutputXML is valid. Comment More infoAdvertise with us Next Article How to Validate XML in JavaScript ? A anjalibo6rb0 Follow Improve Article Tags : JavaScript Web Technologies Similar Reads How to Validate XML against XSD in JavaScript ? 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