The case for monorepos in modern web development

A monorepo keeps multiple related projects — frontend, backend, shared libraries, infra — in a single repository. Critics worry about scale, but with the right tooling a monorepo can outperform a pile of micro-repos on collaboration and consistency. This article makes the case and addresses the common objections.

1. Benefits that actually matter

• **Code sharing** — one `packages/ui` or `packages/utils` used everywhere, no duplicated logic.
• **Atomic changes** — fix a bug in the API and update the client in a single commit.
• **Refactoring confidence** — rename a function and see every caller at once.
• **Consistent tooling** — one lint config, one CI, one dependency version.

txt
my-monorepo/
  apps/
    web/        # Next.js frontend
    api/        # backend service
  packages/
    ui/         # shared components
    config/     # shared eslint/tsconfig

2. Tooling that makes it work

• **Turborepo** / **Nx** — task orchestration with caching and affected-only builds.
• **pnpm workspaces** — fast, disk-efficient dependency management.
• **Changesets** — version and publish shared packages cleanly.

json
// pnpm-workspace.yaml
packages:
  - "apps/*"
  - "packages/*"

3. Addressing the concerns

Concern	Mitigation
Slow builds	Cache + run only affected projects
Tooling complexity	Use Turborepo/Nx pipelines
Huge repo size	Use sparse checkout / VFS
Tight coupling	Enforce package boundaries

4. When a monorepo is the wrong call

• Fully independent teams with separate release cadences and no shared code.
• Regulatory walls that require separating codebases.
• Tiny projects where the overhead isn't worth it.

5. A practical starting point

If you're considering it, start small: put your frontend and its shared UI in one repo with pnpm workspaces, add Turborepo for caching, and grow from there. You get the sharing and atomic-change benefits immediately without a big migration.

Takeaway

Monorepos aren't magic, but for teams shipping related apps they remove a surprising amount of friction: less duplication, safer refactors, and one source of truth. The old "monorepos don't scale" fear is mostly solved by modern tooling.