service-builder

To decouple business logic from Next.js server actions, build pure services with injected dependencies. This approach separates logic from callers, allowing the same service to be used across server actions, API routes, or tools without modification.

Dependency injection in TypeScript services means receiving all required dependencies through the constructor. This pattern promotes testability by ensuring business logic and data access layers remain pure and decoupled from their callers.

Create a testable CRUD service in TypeScript by building a pure service with injected dependencies. This decouples database operations from the caller, making the service reusable and easy to test across different application parts.

Yes, you can use the same service for API routes and MCP tools. By building interface-agnostic services with injected dependencies, the service remains unaware of its callers, allowing it to be used anywhere without modification.

The best way to structure a data access layer in TypeScript is to build pure, interface-agnostic services with injected dependencies. This decouples the data access layer from callers, facilitating reusable and testable business logic.