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Grokking Node.js Design Patterns for Interviews

Solution: Build a Multi-Tenant Service Factory

Explore how to build a multi-tenant service factory using the factory design pattern in Node.js. This lesson helps you centralize object creation, enabling dynamic service instantiation based on tenant and service name. Understand how to implement fallback logic without conditionals to ensure scalable and maintainable code for SaaS platforms with multiple tenants.

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Solution explanation

  • Lines 1–21: We define a serviceRegistry object containing all tenant-specific and default service classes.

    • The acme tenant overrides only the Logger service with AcmeLogger.

    • The default tenant provides DefaultLogger and DefaultAuth, used whenever a tenant doesn’t override a service.

  • Lines 23–29: The createService(tenantId, serviceName) factory resolves and returns the ...