Articles

Technical content for developers and testers working with Brazilian documents and data.

Software Testing

How to Use Fictitious Data in Software Testing

Using real CPF, CNPJ, or credit card data in development and staging environments is a legal and ethical risk. Understand how mathematically valid fic...

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LGPD and Privacy

LGPD for Developers: A Practical Guide

Brazil's Lei Geral de Proteção de Dados (Law 13.709/2018) places clear obligations on those who develop systems that collect, store, or process person...

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Algorithms

How CPF and CNPJ Algorithms Work

CPF and CNPJ are not random number sequences — they contain check digits calculated by a mathematical algorithm based on modulus 11. Understanding thi...

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QA and Testing

Best Practices for Testing with Brazilian Documents

Testing systems that accept Brazilian documents requires attention to algorithmic rules, edge cases, and legal compliance. This guide brings together ...

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Documentation

Complete Guide to Brazilian Identification Documents

Brazil has a complex system of identification documents, each with a distinct structure and purpose. This guide presents the main documents, how they ...

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Development

API Testing with Fictitious Data: Complete Guide

API testing is fundamental in modern software development. Using valid fictitious data, such as algorithmically generated CPFs and CNPJs, ensures your...

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Quality Assurance

QA Automation: Generating Data for Automated Tests

QA automation depends on reliable and diverse data to validate all scenarios of an application. In this article, we explore how fictitious data genera...

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Security

Sensitive Data Masking: A Developer's Guide

Data masking is an essential technique for protecting sensitive information in development and testing environments. With LGPD in effect, understandin...

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Tools

Online Calculation Tools for Developers

In a developer's daily routine, quick calculations are more common than you might think. Unit conversions, percentage calculations, time estimates — i...

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Tools

Online Timers and Stopwatches for Developers

Measuring time is a constant need in a developer's daily routine. Whether timing test durations, managing focus intervals with techniques like Pomodor...

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See also:

Roman Numerals
Base64 Encode/Decode
My IP
JSON Formatter
NIR (France)
SSN Validator (USA)
Unit Converter
QR Code Generator