Generate realistic fake JSON, CSV and XML test data from a sample schema. Free, fast, and runs entirely in your browser.
Paste a sample of the JSON you want to mock into the editor, or start from one of the example schemas. The generator reads the shape of your sample — the field names, nesting and value types — and produces as many realistic records as you ask for that follow the same structure.
Set the number of records, pick the output format (JSON, CSV or XML), and copy or download the result. Field names like name, email, address, phone, date or price are matched to sensible fake values, so the data reads like something a real API would return rather than random noise.
Frontends, dashboards and reports usually need example data long before the backend that produces it exists. Hand-writing that data is slow and error-prone, and copying real production data risks leaking personal information. Generating realistic fake data lets you build, demo and test against records that look real but contain no sensitive information.
Consistent mock data also makes tests reliable: seed a list view, a table or a chart with the same generated set every time and you get repeatable results. It is equally useful for load-testing an endpoint, filling a design mockup, or teaching an API without exposing a live database.
Everything runs in your browser using JavaScript — there is no upload step and no server processing your schema. The tool parses your sample into a template, walks each field, and fills it with a value chosen to match the field name and type. Arrays are repeated, nested objects are recursed into, and the whole set is serialized to your chosen format on the fly.
Because generation is local, large record counts are only limited by your device's memory, and nothing you paste ever leaves the page.
Yes. All values are randomly generated fake data, not real records, so they contain no personal or production information.
Yes. Choose the output format before generating and the same records are serialized to JSON, CSV or XML.
There is no fixed cap. Generation happens in your browser, so the practical limit is your device's available memory.
No. The schema is parsed locally in your browser and is never sent to a server.