Pseudata

Stop Fighting Inconsistent Test Data

Your frontend expects Alice. Your backend returns Bob.
Different faker libraries = Different realities.

Pseudata solves this by making mock data generation a standardized algorithm—not a language-specific implementation.

📖 Read the full story: Why faker.js and Faker Don’t Agree

Key Features

Cross-Language Consistency

Same seed = same data across all languages. No more integration test mismatches.

Infinite Scale

O(1) instant access to billions of records. Zero memory overhead—virtual arrays calculate on demand.

Multi-Locale Support

15+ locales with culturally appropriate names, addresses, and geographic data.

Zero Dependencies

Pure implementation in every language. No FFI, no bindings, just native code.

Same Seed, Same Data

User[1000] with seed 42 = Always the same:

• Same name
• Same email
• Same avatar
• Every time. Every language.

Go

package main
import "github.com/pseudata/pseudata"

users := pseudata.NewUserArray(42)
user := users.At(1000)
fmt.Println(user.Name)  // → "John Smith"
fmt.Println(user.Email) // → "john.smith@example.com"

Java

import dev.pseudata.UserArray;

UserArray users = new UserArray(42);
User user = users.at(1000);
System.out.println(user.getName());  // → "John Smith"
System.out.println(user.getEmail()); // → "john.smith@example.com"

Python

from pseudata import UserArray

users = UserArray(42)
user = users.at(1000)
print(user.name)  # → "John Smith"
print(user.email) # → "john.smith@example.com"

TypeScript

import { UserArray } from "pseudata";

const users = new UserArray(42);
const user = users.at(1000);
console.log(user.name);  // → "John Smith"
console.log(user.email); // → "john.smith@example.com"