Online CSV generator - Generate random SQL data | WarmIndex

ExtendsClass CSV Generator is a free, browser-based tool that generates random CSV, TSV, SQL insert statements, and JSON data for testing, demos, and database seeding.

🚀 Overview

The ExtendsClass CSV Generator is a client-side web application that enables users to create synthetic tabular data quickly and easily without any installations or coding.

It solves the common problem of needing realistic fake data for software testing, prototyping apps, populating databases, or creating demos—saving developers time compared to writing custom scripts or using complex libraries.

This tool is built for developers, QA testers, data analysts, and indie makers who work with CSV-compatible systems. Cyril Bois created it as part of the ExtendsClass.com suite of free online developer utilities to provide instant, no-setup access to powerful data generation right in the browser.

✨ Key Features

Multi-file generation: Create multiple CSV/TSV files at once, bundled in a ZIP archive for easy download.
Multiple formats: Supports CSV, TSV, SQL INSERT statements (with optional CREATE TABLE), and JSON output.
Rich data types: Includes GUID, random integers/floats, dates, regex, names, cities, countries, lorem ipsum, custom JS functions, and more.
Customization: Configure delimiters, quotes, escapes, newlines, headers, row counts, and file counts.
Templates & API: Save configurations for reuse (account required); REST API for programmatic use.
Preview & utilities: Real-time preview, copy to clipboard; upcoming: more data types and enhancements.

🛠 Tech Stack

Frontend: HTML, CSS, JavaScript
Libraries: CodeMirror (editor), Zip.js (ZIP handling), Papa Parse (CSV parsing), random-name, countries.json
Backend: None (fully client-side)
Auth: Site account for templates
Hosting: extendsclass.com