For most JavaScript projects in 2026, npm is the right default, because it ships with Node and has closed nearly every gap that once made Yarn clearly better. Yarn still earns its place in specific workflows, especially its modern Plug-and-Play install model and some monorepo setups, but it is no longer a must-install. So the short answer is: use npm unless you have a concrete reason to prefer Yarn, and never run both in the same repository. Below is the fair comparison and a rule for choosing.
A quick history that explains today
When Yarn launched, npm was slow, its installs were not deterministic, and there was no proper lockfile. Yarn fixed all three: it added a real lockfile, parallel installs, and offline caching. Those features were genuinely better, and they pushed npm to catch up. By 2026, npm has a robust lockfile, fast installs, and workspaces for monorepos, so the original reasons to switch have largely disappeared. Yarn, meanwhile, evolved into a quite different tool in its modern releases.
The comparison
| Factor |
npm |
Yarn (modern) |
| Ships with Node |
Yes |
No, install separately |
| Lockfile |
package-lock.json |
yarn.lock |
| Install model |
node_modules |
Plug-and-Play or node_modules |
| Speed |
Fast |
Fast, sometimes faster with PnP |
| Workspaces / monorepo |
Yes |
Yes, mature |
| Tooling compatibility |
Universal |
PnP needs editor and tool support |
| Best for |
Most projects, the default |
PnP fans, certain monorepos |
Note that classic Yarn and modern Yarn behave quite differently. The modern line moved to Plug-and-Play, which skips the traditional node_modules folder for stricter, often faster resolution, but it requires editors and some tools to understand the new layout.
Which should you choose?
- Starting a new project with no special constraints? Use npm. It is already installed, it is fast enough, and every tool understands it.
- Working on a large monorepo? Both handle workspaces well, and if you are unsure what that even means, see what a monorepo is. Try npm first; reach for Yarn if its workspace tooling fits your release process better.
- Want the strictest dependency resolution and fastest cold installs? Modern Yarn with Plug-and-Play is worth evaluating, as long as your editor and build tools support it.
- Joining an existing project? Use whatever the repo already uses. The lockfile and the documented commands tell you which manager is in play.
A practical rule: pick one manager per repository, commit its lockfile, and do not mix. The lockfile is what guarantees everyone installs the same versions, so it must stay authoritative.
What to skip
- Do not use both in one repo. Two lockfiles mean two sources of truth and unpredictable installs.
- Do not delete or ignore the lockfile. It is what makes installs reproducible across machines and CI.
- Do not switch managers mid-project for a small speed gain. The migration cost usually outweighs the benefit.
- Do not adopt Yarn Plug-and-Play blindly. Confirm your editor, test runner, and bundler support it first, or you will fight resolution errors.
FAQ
Is Yarn still faster than npm in 2026?
The gap has largely closed. npm is fast, and Yarn can be faster in some cold-install scenarios with Plug-and-Play, but for everyday work the difference is rarely decisive.
Do I need to install Yarn?
No. npm ships with Node, so you already have a capable package manager. Install Yarn only if a project requires it or you specifically want its modern features.
Can I switch a project from Yarn to npm?
Yes. Remove the Yarn lockfile, run an npm install to generate package-lock.json, and update your scripts and CI. Test thoroughly, since resolved versions can shift slightly.
Should I commit the lockfile?
Always. The lockfile pins exact dependency versions so every developer and your CI system install identical packages, which is essential for reproducible builds.
Where to go next
Learn what a package manager actually is, compare Node.js with Python for the backend, and explore the best VS Code extensions for your workflow.