Do You Really Need a Monorepo?

Do you really need a monorepo?

Many teams consider monorepos to solve issues with code duplication across services and frontends, but the honest answer is often “probably not at first.” Companies like Google and Meta popularized the concept, and tools like Turborepo and Nx have made it accessible to smaller teams.

This article explores whether a monorepo is truly necessary, or if better contract sharing and utility management can suffice.

Why This Matters

Ideal software architecture often envisions clean separation of concerns, but in practice, code duplication proliferates as projects grow. This leads to maintenance nightmares and inconsistencies. While monorepos promise a solution, they introduce significant complexity; misconfigured tooling can lead to longer CI times, complex caching, and non-obvious dependency graphs, potentially costing teams valuable development time and resources.

Key Insights

• Nx and Turborepo complexity: These tools are powerful, but have a steep learning curve.
• API Specification-Driven Development: Generating code from OpenAPI specifications (e.g., using Hey API) can offer many monorepo benefits without the overhead.
• Hey API: A tool that generates TypeScript types and API client code from OpenAPI specs.

Practical Applications

• Use Case: Large organizations with multiple, tightly coupled applications (admin panel, web app, backend services, UI library) benefit from the unified workflows and atomic changes offered by a monorepo.
• Pitfall: Adopting a monorepo without sufficient tooling expertise can lead to increased fragility and slower development cycles.

References:

• https://dev.to/devops-make-it-run/when-to-use-a-monorepo-3mj9