The Global Developer & QA Testing Suite
The story, engineering pillars, and mission driving the Box4Dev platform.
Our Engineering Pillars
100% of calculations and validations run locally in the user's browser. No test data or generated documents are ever transmitted, stored, or logged on remote servers.
Strict implementation of official checksum algorithms and validation rules (ISO 7064, Modulo 10, 11, 97, Luhn, Damm, SHA-256, and DIN standards).
Static-first architecture powered by the Cloudflare Edge network, delivering sub-50ms latency and high reliability anywhere in the world.
Full user interface and comprehensive technical guides available natively in 5 languages (English, Portuguese, Spanish, German, and French).
Our Story: From an Open-Source Library to a Global Ecosystem
Box4Dev was created in 2021 to solve a critical engineering challenge: the difficulty of obtaining mathematically accurate synthetic data for automated software testing. It began with the @box4dev/gerador-br NPM package, an open-source TypeScript library that rapidly gained adoption within the developer community.
With the rise of global e-invoicing systems, cross-border compliance, and multi-country testing, Box4Dev expanded its horizons. What began as a Brazil-focused tool has evolved into a global suite covering over 49 countries and territories — from European, North American, Asian, and Middle Eastern civil IDs to state-of-the-art fiscal algorithms like ZATCA (Saudi Arabia), Veri*Factu (Spain), KSeF (Poland), and Peppol.
The Box4Dev Ecosystem
Box4Dev is available across multiple formats to seamlessly integrate into your daily workflow:
Online Web Suite
Over 330 modern generators, validators, converters, and utilities available instantly without sign-up.
NPM Packages (@box4dev)
Lightweight, zero-dependency Node.js/TypeScript packages for test automation in CI/CD pipelines.
VS Code Extension
Generate and validate mock data directly in your IDE with fast keyboard shortcuts.
Google Chrome Extension
Instant form auto-filling and in-browser testing with a single click.
About the Creator & Maintainer
Marcelo Lourenço
Marcelo Lourenço is a software architect and quality engineering specialist passionate about open source. He founded Box4Dev with the mission of eliminating testing friction and empowering software engineers globally with fast, dependable, and completely free developer tools.
Frequently Asked Questions
Our mission is to provide the fastest, most precise, and privacy-respecting suite of developer and testing utilities for software engineers and QA professionals worldwide — 100% free and open.