XML/JSON editor and XML validator for Windows ®

Use the XML Validator Buddy software package as your starting point to inspect, check, transform and edit your XML and JSON data.

complete editor screenshot

XML/JSON editor and validator tool - Download the 14 days Free Trial now!

XML Validator Buddy provides several unique functionalities as XML validator and editor. Check and edit huge (multiple GB) XML instance files but don't load them completely into memory. An easy to use XML batch validator and a convenient "Find invalid XML" feature. A Schematron validator and also support for JSON Schema with JSON syntax-coloring and auto-completion. Learn more »


I like the integration on one screen of the XML instance, the Schematron rules with the easy 'Validate' button and the results output pane. XML Validator Buddy makes Schematron development easier and faster.

J. Tschumperlin, New Zealand

Perfect to check my huge (above 3GB) XML data!

Piotr Danowski, Poland

Key Features

XML ValidatorBuddy Desktop application - Light mode
complete editor screenshot
Quick checking of multiple XML documents
XML validator results dialog
JSON editor and validator grid mode
JSON editor and validator


XML Validator Buddy is a software package that allows users to inspect, check, transform, and edit XML and JSON data. It provides several unique functionalities, including the ability to check and edit huge XML instance files without loading them completely into memory, an easy-to-use XML batch validator, and a Schematron validator. It also supports JSON Schema with JSON syntax-coloring and auto-completion. Users can download a 14-day free trial of the software


September 6th, 2021

New version 8 of XML ValidatorBuddy is coming with an optional dark mode user-interface and full support for draft 2019-09 of JSON schema.

September 3rd, 2018

Release of XML ValidatorBuddy 7 - A lot of new JSON functionality and an improved user interface.

March 7th, 2017

Release of XML ValidatorBuddy 5.4: Usability improvements and an update of the Large File editor: XML editor

November 2nd, 2015

New XML grid editor in XML ValidatorBuddy 5.3

March 15th, 2015

Get SHA-2 support with XML ValidatorBuddy 5.1 for XML digital signatures.

September 25th, 2013

Convert CSV input to JSON or XML with XML ValidatorBuddy 4.6

August 9th, 2013

Improved XML to JSON conversions and JSON pretty-print/remove whitespace functionalities with XML ValidatorBuddy 4.5

June 20th, 2013

XPath Evaluator window and quick generation of XPath expressions for your XML in XML ValidatorBuddy 4.4

February 18th, 2013

XML ValidatorBuddy 4.3 is now also a JSON editor with JSON schema support.