📦 JSON / XML Sample Generator
Why Generate Sample JSON and XML?
During development, you constantly need example data: mock API responses for frontend development, test payloads for integration testing, sample documents for parser development, and fixture data for automated tests. Writing this data by hand is tedious and results in unrealistic, repetitive samples (everything becomes “test” and “123”). A generator produces varied, realistic structures that better represent production data.
Example JSON output
JSON vs XML: When to Use Each
| Aspect | JSON | XML |
|---|---|---|
| Readability | More compact, easier to scan | More verbose, self-documenting |
| Parsing speed | Faster (native in JavaScript) | Slower (requires DOM parser) |
| Schema validation | JSON Schema (optional) | XSD, DTD (mature ecosystem) |
| Data types | String, number, boolean, null, array, object | Everything is text (types via schema) |
| Common in | REST APIs, web apps, config files | SOAP services, enterprise systems, RSS |
| Comments | Not supported | Supported |
Use Cases for Sample Data
Frontend development
Build UI components against mock API responses before the backend is ready. This unblocks frontend and backend teams to work in parallel.
API contract testing
Generate payloads that match your API specification to test that endpoints accept valid data and reject invalid data correctly.
Documentation examples
API docs with realistic example payloads are dramatically more useful than docs with placeholder data. Generate examples that show the full structure of your responses.
Database migration testing
When restructuring your data model, generate sample documents in both the old and new format to verify your migration scripts handle edge cases.
Frequently Asked Questions
The generator produces predefined realistic structures. For fully custom schemas, you can use the generated output as a starting point and modify it in your code editor. The copy button makes it easy to grab the output and adapt it.
Yes. All output is syntactically valid JSON or well-formed XML that will parse correctly in any standard parser. You can paste it directly into tools like Postman, jq, or your application code.
The generator produces structures with nested objects and arrays that represent common patterns like user profiles, product catalogs, and API responses. For deeply nested or domain-specific structures, consider using dedicated tools like Mockaroo or JSON Generator.
No. Sample data generation happens entirely in your browser. The templates and randomization logic are embedded in the page’s JavaScript code.