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Private registries can be configured using either .npmrc or bunfig.toml. While both are supported, we recommend using bunfig.toml for enhanced flexibility and Bun-specific options. To configure a registry for a particular npm scope:
bunfig.toml
[install.scopes]
# as a string
"@myorg1" = "https://usertitle:password@registry.myorg.com/"

# as an object with username/password
# you can reference environment variables
"@myorg2" = {
  username = "myusername",
  password = "$npm_pass",
  url = "https://registry.myorg.com/"
}

# as an object with token
"@myorg3" = { token = "$npm_token", url = "https://registry.myorg.com/" }
Your bunfig.toml can reference environment variables. Bun automatically loads environment variables from .env.local, .env.[NODE_ENV], and .env. See Docs > Environment variables for more information.
bunfig.toml
[install.scopes]
"@myorg3" = { token = "$npm_token", url = "https://registry.myorg.com/" }
See Docs > Package manager for complete documentation of Bun’s package manager.