Pseudata

One seed. Every language. Same data.

Deterministic mock data generation for polyglot stacks.

Visit the main repository →

The Problem

Traditional faker libraries produce different data across languages:

# Python (Faker)
Faker.seed(123)
fake.name()  # → "Brett Davis"

// TypeScript (faker.js)
faker.seed(123);
faker.person.fullName();  // → "Miss Dora Kiehn"

Same seed. Different data. Integration chaos.

The Solution

Pseudata uses a standardized algorithm (PCG32) to generate identical data across all languages:

// Go
users := pseudata.NewUserArray(42)
user := users.At(1000)
fmt.Println(user.Name)  // → "John Smith"

// Java
UserArray users = new UserArray(42);
User user = users.at(1000);
System.out.println(user.getName());  // → "John Smith"

# Python
users = UserArray(42)
user = users.at(1000)
print(user.name)  # → "John Smith"

// TypeScript
const users = new UserArray(42);
const user = users.at(1000);
console.log(user.name);  // → "John Smith"

Same seed. Same index. Same data. Every language.

Key Features

• Cross-Language Consistency - Identical data across Go, Java, Python, TypeScript, and more
• Infinite Scale - O(1) instant access to billions of records with zero memory overhead
• Multi-Locale Support - 15+ locales with culturally appropriate data
• Zero Dependencies - Pure native implementation in every language

Use Cases

• Integration Testing - Consistent test data across microservices in different languages
• E2E Testing - Frontend and backend generate matching fixtures
• Data Seeding - Reproducible database seeds across environments
• Demo Data - Identical demos whether in Go backend or React frontend

Resources

Main Repository

pseudata/pseudata - Monorepo with Go, Java, Python, and TypeScript implementations

Documentation & Learning

• pseudata.dev - Complete guides and API reference
• Blog Post - Why cross-language consistency matters
• RSS Feed - Subscribe to updates

Other Repositories

• pseudata/website - Documentation site source (Astro + Starlight)

Current Status

⚠️ Active Development - No releases yet.

We're finalizing core implementations in:

• Go
• Java
• Python
• TypeScript

Future phases will add C#, Rust, PHP, Swift, and Dart.

Get Started

• Star pseudata/pseudata to follow development
• Watch releases to get notified when v1.0 ships
• Read the docs to learn how it works

License

Apache License 2.0