Lerna vs Nx: Which JS Monorepo Tool for CI?
Lerna pioneered JS monorepo versioning and publishing; Nx adds powerful caching and task orchestration (and now maintains Lerna).
Lerna is a classic JavaScript monorepo tool known for versioning and publishing packages. Nx is a broader monorepo platform with computation caching, affected detection, and generators. Notably, Nrwl (Nx’s team) took over Lerna’s maintenance, and modern Lerna can use Nx’s task runner under the hood.
| Lerna | Nx | |
|---|---|---|
| Core strength | Versioning + publishing | Caching + task orchestration |
| Task caching | Via Nx integration | Native (local + remote) |
| Affected detection | Limited (Nx-powered now) | Native project graph |
| Generators / plugins | No | Extensive |
| Relationship | Maintained by Nx team | n/a |
In CI
For pure speed in CI - cache task outputs, run only affected projects, share a remote cache - Nx is the stronger engine, and modern Lerna can delegate task running to Nx to get those benefits. Lerna’s enduring value is its versioning and publishing workflow for multi-package repos. Many teams use Nx for the build/test graph and keep Lerna specifically for coordinated version bumps and npm publishing.
Choosing for pipelines
Want fast affected-only builds with caching and generators: Nx. Need polished multi-package versioning and publishing: Lerna (now Nx-powered for tasks). They are not strictly either/or given the shared maintenance and Nx-backed task running.
The verdict
Want the strongest caching and task orchestration: Nx. Need mature versioning/publishing for many packages: Lerna (which can run tasks via Nx). The two now overlap - use Nx for builds, Lerna for releases if you need both.