What is the XML Mock Data Generator?
The XML Mock Data Generator builds realistic, well-formed XML test data entirely in your browser — no backend, no signup, no uploads. You define your data with a visual field editor or a JSON Schema / template, and the engine produces XML with a proper UTF-8 declaration and <root> wrapper.
Features
- Visual rule editor: Build fields with seven composable rule types — Faker (realistic values), Constant (fixed values), Sequence (auto-incrementing IDs and counters), Weighted (probability distributions like 80% active / 20% paused), Lookup (reference values from other fields), Expression (computed values via JSONata), and Function (custom generator logic)
- Schema & template input: Paste a JSON Schema (Draft 07+) or a template object; both feed the same field model
- XML output with attributes: Mark any field as an XML attribute by naming it with a leading
@(e.g.@id) — it renders as an attribute on the parent element instead of a child element - Well-formed XML: UTF-8 declaration,
<root>wrapper, and proper escaping of<,>,&, and quotes - Deterministic seeding: Same input + seed + locale = identical output every run
- Multi-locale support: 35 locales for localized data
- Bulk generation: Generate up to 10,000 records
- Copy & download: One-click copy to clipboard or download as .xml
Use Cases
- API testing: Generate XML payloads for SOAP or REST XML APIs
- Legacy system integration: Test XML-based data exchange formats
- Configuration file generation: Create sample XML config files
- XSLT transformation testing: Generate source XML for stylesheet development
- Demo environments: Quick XML datasets for presentations
How It Works
Define fields in the visual editor or write a JSON Schema / template. The engine generates JSON internally using your chosen rules, then serializes it to XML. Object keys become element names; arrays produce repeated sibling elements with the same tag name; primitives become text content. Fields whose names start with @ are emitted as XML attributes on their parent element rather than nested child elements.
Frequently Asked Questions
Is my data sent to a server?
No. All generation happens in your browser. Your data never leaves your computer.
How are arrays handled in XML?
Array items are output as repeated sibling elements with the same tag name, derived from the parent key.
What XML encoding is used?
UTF-8 with an XML declaration (<?xml version="1.0" encoding="UTF-8"?>). Special characters (<, >, &, quotes) are properly escaped.
How do I add XML attributes?
Name a field with a leading @ (for example @id or @category). It is rendered as an attribute on the parent element instead of a nested child element. All other fields remain child elements.
How many records can I generate?
Up to 10,000 records per request.