Aphelion vs Faker.js - PostgreSQL Constraint-Safe Alternative

The Problem with Faker.js for Databases

❌ Faker.js Can't Handle

✗
Foreign Key Constraints: You manually track and insert IDs in correct order
✗
Circular Dependencies: No automatic resolution for tables that reference each other
✗
Unique Constraints: Random data often creates duplicates
✗
Complex Types: No support for PostgreSQL-specific types (ltree, JSONB arrays)
✗
Schema Introspection: You manually define every table and column

✅ Aphelion Handles Automatically

✓
Foreign Key Constraints: Automatic topological sorting and ID tracking
✓
Circular Dependencies: Intelligent resolution with NULL insertion and updates
✓
Unique Constraints: Deterministic generation prevents duplicates
✓
Complex Types: Native support for ltree, JSONB, arrays, hierarchies
✓
Schema Introspection: Automatic schema detection from your database

Code Comparison: Generating 1000 Users with Orders

Faker.js (Manual)

// 50+ lines of manual scripting
const { faker } = require('@faker-js/faker');
const { Pool } = require('pg');

const pool = new Pool({...});

async function seed() {
  // 1. Insert users first
  const userIds = [];
  for (let i = 0; i < 1000; i++) {
    const result = await pool.query(
      'INSERT INTO users (name, email) VALUES ($1, $2) RETURNING id',
      [faker.person.fullName(), faker.internet.email()]
    );
    userIds.push(result.rows[0].id);
  }
  
  // 2. Manually track IDs for orders
  for (const userId of userIds) {
    const orderCount = faker.number.int({min: 1, max: 5});
    for (let i = 0; i < orderCount; i++) {
      await pool.query(
        'INSERT INTO orders (user_id, total) VALUES ($1, $2)',
        [userId, faker.number.float({min: 10, max: 1000})]
      );
    }
  }
}

// Handle FK errors manually
// No constraint validation
// Breaks on schema changes

Aphelion (Automatic)

// 1 command
aphelion clone my_db test_db --rows 1000


# That's it!
# - Automatic FK resolution
# - Constraint-safe data
# - Works with any schema
# - Handles circular dependencies
# - Respects unique constraints
# - Supports complex types

When to Use Each Tool

Use Aphelion For:

✓ Database seeding with complex schemas
✓ PostgreSQL test data generation
✓ Foreign key relationships and constraints
✓ CI/CD pipelines and automated testing
✓ Healthcare/Fintech compliance testing
✓ Production-like data for staging environments
✓ When you need deterministic, reproducible data

Use Faker.js For:

✓ Simple mock data in unit tests
✓ Frontend prototypes without databases
✓ API mocking and fixtures
✓ Single-table data generation
✓ When you need custom generators for specific formats
✓ Non-relational data (no FK constraints)
✓ When you're not using PostgreSQL

Migrating from Faker.js to Aphelion

Stop writing manual seed scripts. Let Aphelion handle constraints automatically.

❌ Before (Faker.js)

// seed.js - 200+ lines of manual FK management
const users = [];
for (let i = 0; i < 1000; i++) {
  const user = await insertUser(faker.person.fullName());
  users.push(user.id);
}

for (const userId of users) {
  await insertOrders(userId, faker.number.int({min: 1, max: 5}));
}
// ... and so on for every table

✓ After (Aphelion)

# One command
aphelion clone postgresql://localhost/my_db test_db --rows 1000

# Automatic:
# - FK resolution
# - Constraint handling
# - Topological sorting
# - Circular dependency resolution

Result: Reduce 200+ lines of manual scripting to 1 command.
Save 40+ hours per sprint.

Frequently Asked Questions

Can I use Aphelion with Faker.js?

Yes! Many teams use Aphelion for database seeding (handling FKs and constraints) and Faker.js for frontend mocks and unit test fixtures. They complement each other well.

Does Aphelion support custom data generators like Faker.js?

Yes! Aphelion has built-in generators for healthcare (HIPAA), fintech (PCI-DSS), and telecom data. You can also customize generators in the schema configuration file.

Is Aphelion free like Faker.js?

Aphelion is free forever for local development (up to 1,000 rows per table). For production use, unlimited rows, and CI/CD automation, Pro is $49/year.

What if I'm not using PostgreSQL?

Currently, Aphelion only supports PostgreSQL. If you use MySQL, MongoDB, or other databases, stick with Faker.js or check out Tonic.ai. We're planning MySQL support for Q1 2025.

Stop Writing Manual Seed Scripts

Let Aphelion handle foreign keys and constraints automatically. Free for local development.

Get Download Link View Documentation