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Data Formats

SQL Test Data & INSERT Generator

Generate deterministic multi-row INSERT statements from field definitions or JSON for PostgreSQL, MySQL, and SQLite.

Free to use No sign-up Runs in your browser

Tool workspace

Types: string, email, uuid, integer, number, boolean, date, datetime, null. Add :nullable to emit deterministic NULL values.

What Is an SQL Test Data Generator?

This tool converts compact field definitions or a representative JSON object into repeatable SQL seed data. It generates multi-row INSERT statements with dialect-specific identifier quoting, string escaping, booleans, nulls, numbers, UUIDs, and ISO date values.

How to Generate INSERT SQL

  1. 1Enter one name:type field per line or paste a JSON object or object array.
  2. 2Choose PostgreSQL, MySQL, or SQLite and enter the target table name.
  3. 3Set the number of deterministic rows to generate.
  4. 4Review and copy the INSERT statement into a test database or seed script.

Common Test Data Uses

Database Seed Scripts

Create stable development records that produce the same output on every run.

Integration Tests

Prepare readable fixture inserts for repository and API tests.

JSON Sample Conversion

Infer columns and basic value types from an API or export sample.

Frequently asked questions

How are strings escaped?

Single quotes are doubled according to standard SQL string literal rules, and identifiers use the selected dialect's quoting style.

Is the generated data random?

No. Values are deterministic so snapshots, documentation, and repeated test runs remain stable.

Does this connect to my database?

No. SQL is generated locally in your browser and is never executed automatically.