pnpm 12: Why the Popular JavaScript Package Manager Is Moving to Rust
JavaScript developers install packages every day.
Whether you are building a React app, a Node.js API, or a large monorepo, your package manager plays an important role in your development workflow.
For years, developers have mainly chosen between npm, Yarn, and pnpm.
Now, pnpm 12 brings a major change.
The popular JavaScript package manager has moved its main implementation to Rust. The goal is simple: improve performance while keeping the pnpm workflow developers already know.
This change follows a larger trend in web development. More JavaScript tools are using native languages such as Rust to improve speed.
So, what exactly changed in pnpm 12?
And should developers consider switching from npm or Yarn?
Let’s take a closer look.
What Is pnpm?
pnpm is a package manager for JavaScript and Node.js projects.
Like npm and Yarn, it allows developers to install and manage project dependencies.
For example, you can install a package with:
pnpm add react
Or install all dependencies from an existing project with:
pnpm install
However, pnpm handles packages differently from traditional package managers.
Instead of creating separate copies of the same package for every project, pnpm uses a shared content-addressable store.
This approach can save disk space and make dependency management more efficient.
What’s New in pnpm 12?
The biggest change in pnpm 12 is happening behind the scenes.
The package manager has transitioned to a native implementation built with Rust.
For developers, however, the workflow remains familiar.
Common commands still include:
pnpm install
pnpm add
pnpm remove
pnpm update
pnpm run
Therefore, developers who already use pnpm should not need to completely change how they work.
The major difference is how the package manager executes those operations internally.
Why Is pnpm Moving to Rust?
Performance is one of the main reasons.
Package managers perform many filesystem operations.
When you install dependencies, the package manager needs to:
- Read package metadata
- Resolve dependencies
- Access cached packages
- Create links
- Write files
- Update lockfiles
- Process large dependency trees
These operations can become expensive in large projects.
Rust allows development tools to perform many low-level operations efficiently.
As a result, pnpm can reduce some of the overhead involved in starting and running package management operations.
Why Rust Is Becoming Popular in JavaScript Tools
pnpm is not the first JavaScript development tool to adopt Rust.
In recent years, the web development ecosystem has increasingly used native languages for performance-sensitive tooling.
Rust is attractive because it offers:
- High performance
- Memory safety
- Fast native execution
- Strong concurrency support
- Good cross-platform capabilities
JavaScript remains the language developers use to build their applications.
However, the tools processing JavaScript are increasingly being written in faster native languages.
This creates an interesting combination:
JavaScript for building applications.
Rust for building the tools that process them.
pnpm vs. npm
npm remains the default package manager included with Node.js.
That gives npm one major advantage: convenience.
Install Node.js and npm is already available.
A typical npm installation looks like this:
npm install
With pnpm:
pnpm install
The commands look similar, but dependency storage works differently.
npm
Traditionally, npm installs project dependencies inside the local node_modules directory.
Different projects may contain separate copies of the same dependencies.
pnpm
pnpm stores packages in a shared content-addressable store.
Projects then reference those packages instead of always storing another complete copy.
This can reduce disk usage when developers work with many JavaScript projects.
pnpm vs. Yarn
Yarn is another popular alternative to npm.
It introduced several improvements to JavaScript package management over the years, including workspaces and different dependency installation strategies.
Both Yarn and pnpm are popular for larger projects.
However, pnpm has become especially attractive for developers working with monorepos.
Its efficient dependency storage and workspace features make it useful when many packages live inside one repository.
The best option still depends on your project.
There is no package manager that is automatically perfect for every development team.
Why pnpm Is Popular for Monorepos
A monorepo stores multiple applications or packages inside one repository.
For example:
/apps
/website
/admin
/api
/packages
/ui
/database
/auth
/utils
This structure allows teams to share code between applications.
For example, the website and admin dashboard might both use the same UI package.
However, dependency management can become complicated.
pnpm includes workspace features that make managing these structures easier.
A pnpm-workspace.yaml file can define which directories belong to the workspace.
For example:
packages:
- "apps/*"
- "packages/*"
Developers can then manage multiple connected projects from one workspace.
Why Package Manager Speed Matters
Package installation may seem like a small part of development.
However, it happens frequently.
Developers install dependencies when they:
- Clone repositories
- Change branches
- Update packages
- Build Docker images
- Run CI pipelines
- Deploy applications
- Start new development environments
A few seconds saved locally may not seem important.
However, those seconds can add up across an entire development team.
The impact becomes even larger in automated environments.
pnpm 12 and CI/CD
Continuous integration is one area where package manager performance can matter.
A typical CI workflow might include:
- Clone the repository.
- Install dependencies.
- Run linting.
- Check types.
- Run tests.
- Build the application.
- Deploy.
Dependency installation happens near the beginning of this process.
If installation is slow, every pipeline can take longer.
Large teams may run hundreds or thousands of CI jobs every week.
Therefore, improving dependency installation can help reduce overall build times.
Caching can make an even bigger difference.
pnpm’s storage architecture works particularly well when cached packages are already available.
How to Install pnpm
Developers can use Corepack with supported Node.js environments to manage package manager versions.
A project can also define its expected package manager inside package.json.
For example:
{
"packageManager": "pnpm@12"
}
This helps development teams use consistent package manager versions.
Always check the current pnpm installation documentation before upgrading an important production project.
How to Create a Project With pnpm
Using pnpm is similar to using other JavaScript package managers.
First, create a project:
mkdir my-project
cd my-project
pnpm init
Then install a dependency:
pnpm add express
For a development dependency:
pnpm add -D typescript
You can also remove packages:
pnpm remove express
Or update dependencies:
pnpm update
Developers familiar with npm should find these commands easy to understand.
Should npm Users Switch to pnpm 12?
Not necessarily.
npm remains a solid choice for many JavaScript projects.
If your application is small and npm already works well, switching package managers may provide limited benefits.
However, pnpm becomes more interesting when you work with:
- Large JavaScript applications
- Multiple Node.js projects
- Monorepos
- Large development teams
- Complex CI/CD pipelines
- Projects with many shared dependencies
In those situations, disk efficiency and package management performance can become more important.
Should Existing pnpm Users Upgrade?
Existing pnpm users have a stronger reason to evaluate version 12.
However, major upgrades should always be tested.
Before upgrading, check:
- Your Node.js version
- Framework compatibility
- CI/CD configuration
- Workspace configuration
- Lockfile behavior
- Development tools
- Deployment environment
Run your normal tests after the upgrade.
You should also compare installation performance before and after upgrading.
How to Benchmark pnpm 12
You do not need complicated tools to run a basic comparison.
Start by measuring how long your current dependency installation takes.
Then test pnpm 12 under similar conditions.
Compare both:
Cold Installation
Run an installation without a prepared cache.
This shows how the package manager performs when it needs to retrieve and process dependencies.
Cached Installation
Run another installation with packages already available in the cache.
This can better represent common CI and local development workflows.
Also compare:
- Total installation time
- Disk usage
- CI duration
- Lockfile behavior
- Memory usage
The fastest package manager in a benchmark is not automatically the best one for your project.
Compatibility and reliability matter too.
Are There Downsides to pnpm 12?
Every major architectural change can introduce trade-offs.
A native implementation may produce larger binaries than some previous approaches.
There may also be edge cases that behave differently after a major upgrade.
This is why developers should avoid changing package managers or major versions without testing.
For production projects, use a separate branch and run your complete CI pipeline before migrating.
Is Rust Replacing JavaScript?
No.
The growing use of Rust in developer tools does not mean JavaScript is disappearing.
Instead, the two languages are being used for different purposes.
JavaScript and TypeScript remain excellent choices for building web applications.
Rust is increasingly being used underneath those applications to create fast development infrastructure.
That includes tools related to:
- Bundling
- Compilation
- Parsing
- Package management
- Code transformation
- Development servers
This trend could make the JavaScript ecosystem faster without requiring most web developers to learn Rust.
The Future of JavaScript Developer Tools
pnpm 12 represents something larger than a package manager update.
Web development tools are becoming increasingly performance-focused.
Modern projects can contain thousands of files and hundreds of dependencies. Large monorepos can contain many applications inside the same repository.
At the same time, developers expect tools to feel instant.
They want:
- Faster installations
- Faster builds
- Faster development servers
- Faster type checking
- Faster CI pipelines
Native tooling is one way the JavaScript ecosystem is responding to those expectations.
pnpm moving toward Rust is another sign that the infrastructure behind modern JavaScript development is changing quickly.
Frequently Asked Questions About pnpm 12
What is pnpm 12?
pnpm 12 is a major version of the pnpm JavaScript package manager. One of its biggest changes is the move toward a native Rust implementation designed to improve performance.
Is pnpm faster than npm?
pnpm can be faster in certain workflows, especially when packages are already cached. Actual performance depends on your project, hardware, dependencies, and environment.
Is pnpm 12 written in Rust?
pnpm 12 has transitioned its main implementation toward native Rust tooling while keeping familiar pnpm commands and workflows.
Do I need to learn Rust to use pnpm?
No. Developers continue using normal pnpm commands. Rust works behind the scenes.
Can I use pnpm with React?
Yes. pnpm can manage dependencies for React and many other JavaScript and TypeScript projects.
Is pnpm good for monorepos?
Yes. Workspace support and efficient dependency management make pnpm a popular choice for monorepo projects.
Should I switch from npm to pnpm?
It depends on your project. pnpm can be especially useful for large projects, monorepos, and teams that want efficient dependency storage. Small projects may not need to switch.
Final Thoughts
pnpm 12 is an important update for JavaScript developers.
The move toward Rust shows how much performance matters in modern development tools.
However, the most useful part is that developers do not need to completely change their workflow.
You can still install packages, manage dependencies, run scripts, and work with monorepos using familiar pnpm commands.
The major changes happen behind the scenes.
For developers working with large JavaScript projects, monorepos, or demanding CI/CD pipelines, pnpm 12 is worth testing.
More importantly, it represents a larger trend.
JavaScript is not going away. Instead, the tools around JavaScript are becoming faster.
And increasingly, Rust is powering that change.
