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Mock Data Generator

Build a custom schema and generate up to 1,000 rows of realistic fake data instantly. This tool runs entirely in your browser, meaning it's blazing fast and completely private.

Mock Data Generator
Generate up to 1,000 rows of fake data locally in JSON, CSV, or SQL format.
Local Only
Schema Builder

How ZeroData protects your privacy

  • ✓ No Uploads: Processing happens entirely via client-side JavaScript.
  • ✓ No Storage: We do not have a database. We physically cannot save your data.
  • ✓ No Tracking: We don't log what you process or track your inputs.
  • ✓ Verifiable: Check your DevTools Network tab. You will see 0 outbound requests.

Check out our JSON Formatter, CSV to JSON Converter, or UUID Generator.

Generate Realistic Test Data Locally

Creating realistic test data is a critical part of software development. Whether you're building a new UI and need realistic names and avatars, testing a data import script, or seeding a local database, manually typing fake data is tedious.

The Mock Data Generator uses the powerful Faker.js library directly in your browser. It supports generating names, emails, addresses, phone numbers, UUIDs, dates, and companies without ever sending a single network request.

Supported Output Formats

  • JSON: Ideal for mocking API responses, creating NoSQL documents, or frontend state hydration.
  • CSV: Perfect for testing spreadsheet imports, data analysis pipelines, and legacy system integrations.
  • SQL INSERT: Generates ready-to-execute standard SQL statements for seeding relational databases like PostgreSQL, MySQL, and SQLite.

Privacy and Security

Unlike cloud-based data generators that might log your schemas or track usage, this tool operates with a ZeroData Privacy Moat. The Faker.js engine is loaded into your browser, and all data generation happens locally in your device's memory. You can confidently use it for internal company schemas without violating data privacy policies.

Browser Compatibility

This generator is compatible with all modern web browsers, including Chrome, Firefox, Safari, and Edge. The client-side generation is optimized to handle up to 1,000 rows instantly without freezing your browser.

How to Use the Mock Data Generator

  1. Click 'Load Sample' or manually add fields using the 'Add Field' button.
  2. Define the field name and select the data type (e.g., Name, Email, UUID, etc.).
  3. Specify the number of rows you want to generate (between 1 and 1000).
  4. Select your desired output format (JSON, CSV, or SQL).
  5. Click 'Generate Data' and copy or download the result.

Common Use Cases

  • Generating realistic mock data for UI prototyping and design mockups.
  • Creating test fixtures for unit and integration testing without exposing real user data.
  • Seeding local development databases with SQL INSERT statements.
  • Mocking API responses (JSON) for frontend development before the backend is ready.
  • Producing sample CSV files for testing data import/export functionality.

Frequently Asked Questions

Is the generated data sent to a server?

No, all mock data is generated 100% locally in your browser using Faker.js. Nothing is uploaded or logged.

What output formats are supported?

You can export the generated mock data as JSON, CSV, or SQL INSERT statements, making it easy to seed databases or mock APIs.

How many rows can I generate at once?

You can generate up to 1,000 rows of mock data in a single batch to keep browser performance optimal.

Can I customize the field names?

Yes, you can define custom field names for your schema, and they will be used as the keys in JSON, column headers in CSV, and column names in SQL.

Is this tool free to use?

Yes, this Mock Data Generator is completely free and requires no account or sign-up.

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