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DevBy Daniel BeglaryanUpdated August 2026

Generate Mock Data

Build realistic fake test data as JSON, CSV, or SQL from fields you define.

PrivateWorks OfflineNo Account

Fields (4)

Rows to generate

max 1,000

Reproducible seed

Use seed

Output format

Everything runs in your browser — no data is uploaded. Turn on a seed to get the exact same rows every time, which is handy for repeatable test fixtures.

Deep dive

About Generate Mock Data.

Generate Realistic Mock Data in Seconds

Define your columns — a name and a type for each — pick how many rows you need, and get clean test data as JSON, CSV, or SQL INSERT statements. Names, emails, phone numbers, addresses, companies, dates, UUIDs, prices, and more come from the well-known Faker library, so the values look real instead of "aaa" and "123".

Everything is generated in your browser. Nothing you configure or download is sent to a server, there is no sign-up, and there are no daily caps beyond the free preview limit. Turn on a seed to get the exact same rows on every run — ideal for repeatable test fixtures and demos.

Common Use Cases

Seed a database: Generate SQL INSERT statements, with an optional CREATE TABLE, to fill a dev or staging table with realistic rows.
Mock a front-end API: Produce a JSON array to stub an endpoint, populate a list, or test pagination and empty states.
Test spreadsheet imports: Export CSV to exercise your import parser, column mapping, and tricky cases like commas and quotes inside text.
Demos and screenshots: Fill a UI with plausible names, companies, and prices instead of placeholder gibberish.
Load and QA testing: Spin up to 1,000 rows to push tables, filters, and search under realistic volume.
Reproducible fixtures: Set a fixed seed so the generated data is byte-for-byte identical each time a test runs.

One honest caveat: this is fabricated data for testing, not real records. Faker's values are realistic but random — never treat a generated email, phone number, or account number as a valid contact or financial detail.

Privacy: The generator runs entirely in your browser. Your field setup and the data it produces never leave your device.

Three steps