Nx vs Turborepo vs Lerna: Choosing Your Monorepo Tool in 2026

Monorepos — single Git repositories containing multiple projects or packages — have become the default architecture at companies like Google, Meta, and Microsoft. In the JavaScript ecosystem, the rise of monorepos has spawned a competitive tooling landscape: Nx, Turborepo, and Lerna are the three most prominent options, each taking a different philosophy to solving the same core problem: making large codebases fast and maintainable. This guide compares all three in depth — their architecture, caching strategies, task orchestration, ecosystem integrations, and the scenarios where each shines. Why Monorepos? The Problem They Solve Before comparing tools, it's worth understanding what problem they solve. A monorepo containing 20 packages has 20 sets of dependencies, 20 build pipelines, and 20 test suites. Without tooling, npm install in the root, then building every package in sequence, would take 30+ minutes on any non-trivial codebase. Monorepo tools solve this with three mechanisms: De