cargo-login — Log in to a registry


cargo login [options] [token] [-- args]


This command will run a credential provider to save a token so that commands that require authentication, such as cargo-publish(1), will be automatically authenticated.

All the arguments following the two dashes (--) are passed to the credential provider.

For the default cargo:token credential provider, the token is saved in $CARGO_HOME/credentials.toml. CARGO_HOME defaults to .cargo in your home directory.

If a registry has a credential-provider specified, it will be used. Otherwise, the providers from the config value will be attempted, starting from the end of the list.

If the token argument is not specified, it will be read from stdin.

The API token for may be retrieved from

Take care to keep the token secret, it should not be shared with anyone else.


Login Options

--registry registry
Name of the registry to use. Registry names are defined in Cargo config files. If not specified, the default registry is used, which is defined by the registry.default config key which defaults to crates-io.

Display Options

Use verbose output. May be specified twice for “very verbose” output which includes extra output such as dependency warnings and build script output. May also be specified with the term.verbose config value.
Do not print cargo log messages. May also be specified with the term.quiet config value.
--color when
Control when colored output is used. Valid values:

  • auto (default): Automatically detect if color support is available on the terminal.
  • always: Always display colors.
  • never: Never display colors.

May also be specified with the term.color config value.

Common Options

If Cargo has been installed with rustup, and the first argument to cargo begins with +, it will be interpreted as a rustup toolchain name (such as +stable or +nightly). See the rustup documentation for more information about how toolchain overrides work.
--config KEY=VALUE or PATH
Overrides a Cargo configuration value. The argument should be in TOML syntax of KEY=VALUE, or provided as a path to an extra configuration file. This flag may be specified multiple times. See the command-line overrides section for more information.
Changes the current working directory before executing any specified operations. This affects things like where cargo looks by default for the project manifest (Cargo.toml), as well as the directories searched for discovering .cargo/config.toml, for example. This option must appear before the command name, for example cargo -C path/to/my-project build.

This option is only available on the nightly channel and requires the -Z unstable-options flag to enable (see #10098).

Prints help information.
-Z flag
Unstable (nightly-only) flags to Cargo. Run cargo -Z help for details.


See the reference for details on environment variables that Cargo reads.


  • 0: Cargo succeeded.
  • 101: Cargo failed to complete.


  1. Save the token for the default registry:

    cargo login
  2. Save the token for a specific registry:

    cargo login --registry my-registry


cargo(1), cargo-logout(1), cargo-publish(1)