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Online JSON Dataset Generator.

Need Custom Conversion?

Generate JSON datasets for API payload testing, mock servers, and schema validation workflows.

Quick Options (Rows):

Field Name Type Options

Field Separator
Other

Sample output structure

{
  "users": [{"id": 1, "name": "John"}]
}

Quick use cases

API response mocking Contract test fixtures Nested object QA

Common generator issues

  • Trailing commas
  • Type mismatches
  • Missing required keys

Generator feature notes

  • Build custom field schema from the column/type table before generation.
  • Use quick row presets for fast payload-size checks.
  • Generate downloadable JSON fixtures for API integration tests.

Inspect generated payloads with JSON Viewer before handing data to frontend or backend tests.

For tabular QA scenarios, transform output using JSON to CSV.

Feature boundaries and controls

  • Set rows, files, and columns using the built-in limits shown beside each control.
  • CSV supports custom separators (preset or custom token).
  • XLSX generation supports sheet count controls and downloads directly.
  • vCard generation supports selectable vCard versions and contact field toggles.

Dataset generator FAQ

Can I control JSON field names and value types?

Yes. Configure field name and type in the input table before generation.

Is this useful for API mock payloads?

Yes, generated JSON can be used as fixture data for API and frontend testing.

Can I download generated JSON directly?

Yes. Generate output, set filename, and download from the result panel.