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

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.
package.json
{  "dependencies": {  "zod": "^3.0.0"  } } 

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.
terminal
bun add zod --exact 

To specify an exact version or a tag:
terminal
bun add [email protected] bun add zod@next 

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