Quick Summary
Online XML Viewer is an in-browser developer utility to pretty-print XML documents, validate syntax errors with native DOMParser, minify tag payloads, and convert XML trees into JSON objects.
Online XML Viewer & Pretty Printer
Pretty-print XML code, validate tag structures, and convert XML trees into JSON objects with complete client-side security.
Automatic tag indentation
Formats nested XML nodes with clean 2-space indentation and syntax highlighting.
XML Syntax validation
Detects unclosed tags, attribute syntax mismatches, and XML malformations instantly.
XML to JSON Engine
Converts XML node trees and attributes directly into clean JSON object arrays.
Frequently asked questions
How do I format an XML file online?
Paste your XML code into the editor pane and click 'Format XML' (or press Alt+1). The tool formats tag nesting with proper line breaks and indentation.
Is my XML data stored on a backend server?
No. OnlineViewer Dev uses native browser DOMParser APIs to format and validate XML locally inside memory without sending data over network requests.