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Grokking Node.js Design Patterns for Interviews

Build a Multi-Tenant Service Factory

Explore how to centralize service creation for a multi-tenant SaaS platform by using the Factory pattern. Learn to build a dynamic factory method that selects tenant-specific or default services through object lookups and fallback chaining, avoiding conditional statements. By the end, you'll understand how to write scalable and maintainable code that handles service overrides transparently.

We'll cover the following...

Problem statement

You’re building a SaaS platform with multiple tenants. Each tenant can override specific services, such as Logger, Auth, or Mailer. Your system holds a global service registry structured like this:

const serviceRegistry = {
  acme: {
    Logger: class AcmeLogger {
      log(msg) {
        return `Acme log: ${msg}`;
      }
    }
  },
  default: {
    Logger: class DefaultLogger {
      log(msg) {
        return `Default log: ${msg}`;
      }
    },
    Auth: class DefaultAuth {
      login(user) {
        return `Default login for ${user}`;
      }
    }
  }
};
...