NPM vs Yarn vs pnpm vs Bun: Which Package Manager Should You Use in 2026?

Every JavaScript project starts the same way: you need to install dependencies. But in 2026, you have four serious options — and the choice matters more than most people admit.

I've shipped projects with all four. Here's my honest breakdown so you can pick one and stop second-guessing yourself.

The Quick Answer

If you just want a recommendation:

• 🆕 Starting a new project? → pnpm or Bun
• 🏢 Working on an existing codebase? → Stick with whatever it already uses
• 🗂️ In a large monorepo? → pnpm — nothing else comes close
• ⚡ Want the absolute fastest installs? → Bun
• 🤷 Don't want to think about it? → npm is fine, really

npm — The One That Ships with Node

npm comes pre-installed with Node.js, which is both its biggest strength and the reason people take it for granted. It's everywhere — every tutorial, every CI pipeline, every Dockerfile you've ever copy-pasted.

npm install
npm run dev
npm install lodash

The problem? npm was notoriously slow for years, and it still writes a flat node_modules folder that grows to terrifying sizes. The node_modules meme exists because of npm.

💡 It's gotten much better since v7 (workspaces) and v9 (performance improvements), but it's still the slowest of the four when you benchmark a cold install.

Who should use it: Beginners, solo projects, or situations where you genuinely can't add tooling. Otherwise, there are better options.

Yarn — The Veteran Challenger

Yarn was created by Facebook in 2016 specifically to fix npm's problems — mainly speed and reliability. It introduced yarn.lock, parallel installs, and a notably nicer CLI.

yarn install
yarn dev
yarn add lodash

Yarn Classic (v1) is still widely used and battle-tested — you'll find it in countless large open source projects. Yarn Berry (v2+) is a complete rewrite with a radical feature called Plug'n'Play (PnP) — it eliminates node_modules entirely and resolves dependencies from a single .pnp.cjs file.

I tried Yarn Berry on a project in 2022. The speed was impressive. The compatibility headaches with tools that assume node_modules exists were... less impressive. Your mileage may vary.

Who should use it: Teams already using it, or developers who want to experiment with PnP on a greenfield project with modern tooling.

pnpm — My Daily Driver

pnpm is what npm should have been from the start. Instead of copying packages into every project's node_modules, pnpm stores everything in a global content-addressable store and uses hard links. Install lodash in 10 projects — it only exists on disk once.

pnpm install
pnpm dev
pnpm add lodash

The structure looks like this:

my-project/
  node_modules/
    .pnpm/          ← actual packages, stored as hard links
    lodash → .pnpm/lodash@4.17.21/node_modules/lodash

The results are real. On my MacBook, switching a large project from npm to pnpm cut install time by ~60% and freed up several gigabytes of disk space. If you've ever run npx npkill and been horrified by how much space node_modules was eating — pnpm solves that problem permanently.

It also enforces strict dependency isolation — you can't accidentally use a package you didn't explicitly declare. This has already caught implicit dependency bugs on two of my projects that would have caused subtle production issues.

🏆 This blog is built with pnpm. I switched from npm about two years ago and haven't looked back.

Who should use it: Anyone starting a new project, monorepo teams, and developers who are serious about disk efficiency and dependency correctness.

Bun — The Exciting New Arrival

Bun isn't just a package manager — it's an entire JavaScript runtime (like Node.js), bundler, test runner, and package manager in one. Written in Zig, it's engineered from the ground up for raw speed.

bun install
bun dev
bun add lodash

The first time I ran bun install on a large Next.js project, I genuinely thought something had gone wrong. It finished before the terminal had even scrolled. Installs that take 30+ seconds with npm can take under 3 seconds with Bun.

It has its own lockfile (bun.lockb) and is mostly compatible with the npm registry and existing package.json files. The trade-off is maturity — edge cases and occasional compatibility issues still surface, especially with packages that rely on native Node.js internals.

🚀 Bun is moving incredibly fast. Check the Bun changelog — major improvements ship almost every month.

Who should use it: New projects where you want maximum speed and don't mind the occasional rough edge. Increasingly safe for production in 2026.

Head-to-Head Comparison

The node_modules Problem, Visualised

All four managers (except Yarn Berry with PnP) create a node_modules folder. The difference is how:

• npm / Yarn Classic — copies everything. 10 projects means 10 full copies of React on your disk
• pnpm — hard links from a global store. 10 projects, 1 copy of React
• Bun — similar global cache approach, comparably disk-efficient

If you've ever cleaned up old projects with npx npkill and freed 20GB in one go — pnpm prevents that accumulation from happening in the first place.

What I Actually Use

This blog uses pnpm. It's fast, saves disk space, and the strict dependency isolation has already prevented real bugs.

If I were starting fresh today with no constraints, I'd take a hard look at Bun — the speed is difficult to argue against, and the ecosystem compatibility story gets better with every release.

The Honest Bottom Line

Don't lose sleep over this. The best package manager is the one your team already uses consistently. Mixing package managers in one project — some devs on npm, others on Yarn — causes far more pain than any performance gap between them.

That said, if you have the freedom to choose:

• Pragmatic pick → pnpm
• Exciting pick → Bun
• Safe default → npm

Pick one. Commit to it. Then focus on actually building things.