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Bun’s package manager supports npm "workspaces". This allows you to split a codebase into multiple distinct “packages” that live in the same repository, can depend on each other, and (when possible) share a node_modules directory. Clone this sample project to experiment with workspaces.
The root package.json should not contain any "dependencies", "devDependencies", etc. Each individual package should be self-contained and declare its own dependencies. Similarly, it’s conventional to declare "private": true to avoid accidentally publishing the root package to npm.
package.json
{
	"name": "my-monorepo",
	"private": true,
	"workspaces": ["packages/*"]
}
It’s common to place all packages in a packages directory. The "workspaces" field in package.json supports glob patterns, so you can use packages/* to indicate that each subdirectory of packages should be considered separate package (also known as a workspace).
File Tree
.
├── package.json
├── node_modules
└── packages
    ├── stuff-a
    │   └── package.json
    └── stuff-b
        └── package.json
To add dependencies between workspaces, use the "workspace:*" syntax. Here we’re adding stuff-a as a dependency of stuff-b.
packages/stuff-b/package.json
{
	"name": "stuff-b",
	"dependencies": {
		"stuff-a": "workspace:*"
	}
}
Once added, run bun install from the project root to install dependencies for all workspaces.
terminal
bun install
To add npm dependencies to a particular workspace, just cd to the appropriate directory and run bun add commands as you would normally. Bun will detect that you are in a workspace and hoist the dependency as needed.
terminal
cd packages/stuff-a
bun add zod
See Docs > Package manager for complete documentation of Bun’s package manager.
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