To add an npm package as a dependency, use bun add.

bun add zod

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This will add the package to dependencies in package.json. By default, the ^ range specifier will be used, to indicate that any future minor or patch versions are acceptable.

{
  "dependencies": {
    "zod": "^3.0.0"
  }
}

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To "pin" to an exact version of the package, use --exact. This will add the package to dependencies without the ^, pinning your project to the exact version you installed.

bun add zod --exact

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To specify an exact version or a tag:

bun add zod@3.0.0
bun add zod@next

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See Docs > Package manager for complete documentation of Bun's package manager.