Mock Data Generator
Free Mock Data Generator
Generate realistic, large-scale fake data instantly. Build custom test datasets for Users, Products, Companies, and Transactions, and export them as JSON, CSV, YAML, TOML, or TOON directly in your browser.
- Multiple Formats: Export as JSON, CSV, YAML, TOML, TOON
- Instant Generation: Generate up to 1000 records instantly
- Offline Ready: 100% client-side processing using faker.js
Why generate mock data in your browser?
Test data generators often need to run against real schemas that hint at your actual data model, which is awkward to paste into a third-party site. This tool runs faker.js entirely client-side, so your field names and structure choices never leave your browser, and generation is instant since there's no server round-trip.
What you can generate
What you can generate
- Realistic templates: Users, Products, Companies, and Transactions with sensible field defaults
- Up to 1000 records: Generate large batches instantly for load-testing UIs or APIs
- Five export formats: JSON, CSV, YAML, TOML, and TOON, so it fits whatever your test harness expects
How to Use
- Select a data template (e.g. Users, Products)
- Choose the number of records to generate
- Select your preferred export format
- Copy the generated output to your clipboard
💡 Pro Tips
- Use the TOON export if you're feeding the generated data into an LLM prompt — it uses meaningfully fewer tokens than JSON for large, uniform arrays.
Glossary
- Mock Data
- Artificially generated data that mimics the structure and realism of production data, used for testing without exposing real user information.
- faker.js
- A JavaScript library for generating realistic placeholder data — names, addresses, emails, and more — used to power this tool's templates.
- Seed Data
- Initial data used to populate a database or application for development and testing, often generated rather than pulled from production.