CARGO-METADATA(1)

NAME
       cargo-metadata — Machine-readable metadata about the current package

SYNOPSIS
       cargo metadata [options]

DESCRIPTION
       Output JSON to stdout containing information about the workspace members
       and resolved dependencies of the current package.

       The output format is subject to change in future versions of Cargo. It
       is recommended to include the --format-version flag to future-proof your
       code and ensure the output is in the format you are expecting. For more
       on the expectations, see “Compatibility”.

       See the cargo_metadata crate <https://crates.io/crates/cargo_metadata>
       for a Rust API for reading the metadata.

OUTPUT FORMAT
   Compatibility
       Within the same output format version, the compatibility is maintained,
       except some scenarios. The following is a non-exhaustive list of changes
       that are not considered as incompatible:

       o  Adding new fields — New fields will be added when needed. Reserving
          this helps Cargo evolve without bumping the format version too often.

       o  Adding new values for enum-like fields — Same as adding new fields.
          It keeps metadata evolving without stagnation.

       o  Changing opaque representations — The inner representations of some
          fields are implementation details. For example, fields related to
          “Source ID” are treated as opaque identifiers to differentiate
          packages or sources. Consumers shouldn’t rely on those
          representations unless specified.

   JSON format
       The JSON output has the following format:

           {
               /* Array of all packages in the workspace.
                  It also includes all feature-enabled dependencies unless --no-deps is used.
               */
               "packages": [
                   {
                       /* The name of the package. */
                       "name": "my-package",
                       /* The version of the package. */
                       "version": "0.1.0",
                       /* The Package ID for referring to the
                          package within the document and as the `--package` argument to many commands
                       */
                       "id": "file:///path/to/my-package#0.1.0",
                       /* The license value from the manifest, or null. */
                       "license": "MIT/Apache-2.0",
                       /* The license-file value from the manifest, or null. */
                       "license_file": "LICENSE",
                       /* The description value from the manifest, or null. */
                       "description": "Package description.",
                       /* The source ID of the package, an "opaque" identifier representing
                          where a package is retrieved from. See "Compatibility" above for
                          the stability guarantee.
           
                          This is null for path dependencies and workspace members.
           
                          For other dependencies, it is a string with the format:
                          - "registry+URL" for registry-based dependencies.
                            Example: "registry+https://github.com/rust-lang/crates.io-index"
                          - "git+URL" for git-based dependencies.
                            Example: "git+https://github.com/rust-lang/cargo?rev=5e85ba14aaa20f8133863373404cb0af69eeef2c#5e85ba14aaa20f8133863373404cb0af69eeef2c"
                          - "sparse+URL" for dependencies from a sparse registry
                            Example: "sparse+https://my-sparse-registry.org"
           
                          The value after the `+` is not explicitly defined, and may change
                          between versions of Cargo and may not directly correlate to other
                          things, such as registry definitions in a config file. New source
                          kinds may be added in the future which will have different `+`
                          prefixed identifiers.
                       */
                       "source": null,
                       /* Array of dependencies declared in the package's manifest. */
                       "dependencies": [
                           {
                               /* The name of the dependency. */
                               "name": "bitflags",
                               /* The source ID of the dependency. May be null, see
                                  description for the package source.
                               */
                               "source": "registry+https://github.com/rust-lang/crates.io-index",
                               /* The version requirement for the dependency.
                                  Dependencies without a version requirement have a value of "*".
                               */
                               "req": "^1.0",
                               /* The dependency kind.
                                  "dev", "build", or null for a normal dependency.
                               */
                               "kind": null,
                               /* If the dependency is renamed, this is the new name for
                                  the dependency as a string.  null if it is not renamed.
                               */
                               "rename": null,
                               /* Boolean of whether or not this is an optional dependency. */
                               "optional": false,
                               /* Boolean of whether or not default features are enabled. */
                               "uses_default_features": true,
                               /* Array of features enabled. */
                               "features": [],
                               /* The target platform for the dependency.
                                  null if not a target dependency.
                               */
                               "target": "cfg(windows)",
                               /* The file system path for a local path dependency.
                                  not present if not a path dependency.
                               */
                               "path": "/path/to/dep",
                               /* A string of the URL of the registry this dependency is from.
                                  If not specified or null, the dependency is from the default
                                  registry (crates.io).
                               */
                               "registry": null,
                               /* (unstable) Boolean flag of whether or not this is a pulbic
                                  dependency. This field is only present when
                                  `-Zpublic-dependency` is enabled.
                               */
                               "public": false
                           }
                       ],
                       /* Array of Cargo targets. */
                       "targets": [
                           {
                               /* Array of target kinds.
                                  - lib targets list the `crate-type` values from the
                                    manifest such as "lib", "rlib", "dylib",
                                    "proc-macro", etc. (default ["lib"])
                                  - binary is ["bin"]
                                  - example is ["example"]
                                  - integration test is ["test"]
                                  - benchmark is ["bench"]
                                  - build script is ["custom-build"]
                               */
                               "kind": [
                                   "bin"
                               ],
                               /* Array of crate types.
                                  - lib and example libraries list the `crate-type` values
                                    from the manifest such as "lib", "rlib", "dylib",
                                    "proc-macro", etc. (default ["lib"])
                                  - all other target kinds are ["bin"]
                               */
                               "crate_types": [
                                   "bin"
                               ],
                               /* The name of the target.
                                  For lib targets, dashes will be replaced with underscores.
                               */
                               "name": "my-package",
                               /* Absolute path to the root source file of the target. */
                               "src_path": "/path/to/my-package/src/main.rs",
                               /* The Rust edition of the target.
                                  Defaults to the package edition.
                               */
                               "edition": "2018",
                               /* Array of required features.
                                  This property is not included if no required features are set.
                               */
                               "required-features": ["feat1"],
                               /* Whether the target should be documented by `cargo doc`. */
                               "doc": true,
                               /* Whether or not this target has doc tests enabled, and
                                  the target is compatible with doc testing.
                               */
                               "doctest": false,
                               /* Whether or not this target should be built and run with `--test`
                               */
                               "test": true
                           }
                       ],
                       /* Set of features defined for the package.
                          Each feature maps to an array of features or dependencies it
                          enables.
                       */
                       "features": {
                           "default": [
                               "feat1"
                           ],
                           "feat1": [],
                           "feat2": []
                       },
                       /* Absolute path to this package's manifest. */
                       "manifest_path": "/path/to/my-package/Cargo.toml",
                       /* Package metadata.
                          This is null if no metadata is specified.
                       */
                       "metadata": {
                           "docs": {
                               "rs": {
                                   "all-features": true
                               }
                           }
                       },
                       /* List of registries to which this package may be published.
                          Publishing is unrestricted if null, and forbidden if an empty array. */
                       "publish": [
                           "crates-io"
                       ],
                       /* Array of authors from the manifest.
                          Empty array if no authors specified.
                       */
                       "authors": [
                           "Jane Doe <user@example.com>"
                       ],
                       /* Array of categories from the manifest. */
                       "categories": [
                           "command-line-utilities"
                       ],
                       /* Optional string that is the default binary picked by cargo run. */
                       "default_run": null,
                       /* Optional string that is the minimum supported rust version */
                       "rust_version": "1.56",
                       /* Array of keywords from the manifest. */
                       "keywords": [
                           "cli"
                       ],
                       /* The readme value from the manifest or null if not specified. */
                       "readme": "README.md",
                       /* The repository value from the manifest or null if not specified. */
                       "repository": "https://github.com/rust-lang/cargo",
                       /* The homepage value from the manifest or null if not specified. */
                       "homepage": "https://rust-lang.org",
                       /* The documentation value from the manifest or null if not specified. */
                       "documentation": "https://doc.rust-lang.org/stable/std",
                       /* The default edition of the package.
                          Note that individual targets may have different editions.
                       */
                       "edition": "2018",
                       /* Optional string that is the name of a native library the package
                          is linking to.
                       */
                       "links": null,
                   }
               ],
               /* Array of members of the workspace.
                  Each entry is the Package ID for the package.
               */
               "workspace_members": [
                   "file:///path/to/my-package#0.1.0",
               ],
               /* Array of default members of the workspace.
                  Each entry is the Package ID for the package.
               */
               "workspace_default_members": [
                   "file:///path/to/my-package#0.1.0",
               ],
               // The resolved dependency graph for the entire workspace. The enabled
               // features are based on the enabled features for the "current" package.
               // Inactivated optional dependencies are not listed.
               //
               // This is null if --no-deps is specified.
               //
               // By default, this includes all dependencies for all target platforms.
               // The `--filter-platform` flag may be used to narrow to a specific
               // target triple.
               "resolve": {
                   /* Array of nodes within the dependency graph.
                      Each node is a package.
                   */
                   "nodes": [
                       {
                           /* The Package ID of this node. */
                           "id": "file:///path/to/my-package#0.1.0",
                           /* The dependencies of this package, an array of Package IDs. */
                           "dependencies": [
                               "https://github.com/rust-lang/crates.io-index#bitflags@1.0.4"
                           ],
                           /* The dependencies of this package. This is an alternative to
                              "dependencies" which contains additional information. In
                              particular, this handles renamed dependencies.
                           */
                           "deps": [
                               {
                                   /* The name of the dependency's library target.
                                      If this is a renamed dependency, this is the new
                                      name.
                                   */
                                   "name": "bitflags",
                                   /* The Package ID of the dependency. */
                                   "pkg": "https://github.com/rust-lang/crates.io-index#bitflags@1.0.4"
                                   /* Array of dependency kinds. Added in Cargo 1.40. */
                                   "dep_kinds": [
                                       {
                                           /* The dependency kind.
                                              "dev", "build", or null for a normal dependency.
                                           */
                                           "kind": null,
                                           /* The target platform for the dependency.
                                              null if not a target dependency.
                                           */
                                           "target": "cfg(windows)"
                                       }
                                   ]
                               }
                           ],
                           /* Array of features enabled on this package. */
                           "features": [
                               "default"
                           ]
                       }
                   ],
                   /* The package in the current working directory (if --manifest-path is not given).
                      This is null if there is a virtual workspace. Otherwise it is
                      the Package ID of the package.
                   */
                   "root": "file:///path/to/my-package#0.1.0",
               },
               /* The absolute path to the target directory where Cargo places its output. */
               "target_directory": "/path/to/my-package/target",
               /* The absolute path to the build directory where Cargo places intermediate build artifacts. (unstable) */
               "build_directory": "/path/to/my-package/build-dir",
               /* The version of the schema for this metadata structure.
                  This will be changed if incompatible changes are ever made.
               */
               "version": 1,
               /* The absolute path to the root of the workspace. */
               "workspace_root": "/path/to/my-package"
               /* Workspace metadata.
                  This is null if no metadata is specified. */
               "metadata": {
                   "docs": {
                       "rs": {
                           "all-features": true
                       }
                   }
               }
           }

       Notes:

       o  For "id" field syntax, see Package ID Specifications
          <https://doc.rust-lang.org/cargo/reference/pkgid-spec.html> in the
          reference.

OPTIONS
   Output Options
       --no-deps
           Output information only about the workspace members and don’t
           fetch dependencies.

       --format-version version
           Specify the version of the output format to use. Currently 1 is the
           only possible value.

       --filter-platform triple
           This filters the resolve output to only include dependencies for the
           given target triple
           <https://doc.rust-lang.org/cargo/appendix/glossary.html#target>. A
           literal "host-tuple" can be used, which will internally be
           substituted by the host’s target. Without this flag, the resolve
           includes all targets.

           Note that the dependencies listed in the “packages” array still
           includes all dependencies. Each package definition is intended to be
           an unaltered reproduction of the information within Cargo.toml.

   Feature Selection
       The feature flags allow you to control which features are enabled. When
       no feature options are given, the default feature is activated for every
       selected package.

       See the features documentation
       <https://doc.rust-lang.org/cargo/reference/features.html#command-line-feature-options>
       for more details.

       -F features, --features features
           Space or comma separated list of features to activate. Features of
           workspace members may be enabled with package-name/feature-name
           syntax. This flag may be specified multiple times, which enables all
           specified features.

       --all-features
           Activate all available features of all selected packages.

       --no-default-features
           Do not activate the default feature of the selected packages.

   Display Options
       -v, --verbose
           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
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       -q, --quiet
           Do not print cargo log messages. May also be specified with the
           term.quiet config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       --color when
           Control when colored output is used. Valid values:

           o  auto (default): Automatically detect if color support is
              available on the terminal.

           o  always: Always display colors.

           o  never: Never display colors.

           May also be specified with the term.color config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

   Manifest Options
       --manifest-path path
           Path to the Cargo.toml file. By default, Cargo searches for the
           Cargo.toml file in the current directory or any parent directory.

       --locked
           Asserts that the exact same dependencies and versions are used as
           when the existing Cargo.lock file was originally generated. Cargo
           will exit with an error when either of the following scenarios
           arises:

           o  The lock file is missing.

           o  Cargo attempted to change the lock file due to a different
              dependency resolution.

           It may be used in environments where deterministic builds are
           desired, such as in CI pipelines.

       --offline
           Prevents Cargo from accessing the network for any reason. Without
           this flag, Cargo will stop with an error if it needs to access the
           network and the network is not available. With this flag, Cargo will
           attempt to proceed without the network if possible.

           Beware that this may result in different dependency resolution than
           online mode. Cargo will restrict itself to crates that are
           downloaded locally, even if there might be a newer version as
           indicated in the local copy of the index. See the cargo-fetch(1)
           command to download dependencies before going offline.

           May also be specified with the net.offline config value
           <https://doc.rust-lang.org/cargo/reference/config.html>.

       --frozen
           Equivalent to specifying both --locked and --offline.

   Common Options
       +toolchain
           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
           <https://rust-lang.github.io/rustup/overrides.html> 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
           <https://doc.rust-lang.org/cargo/reference/config.html#command-line-overrides>
           for more information.

       -C PATH
           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
           <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html> and
           requires the -Z unstable-options flag to enable (see #10098
           <https://github.com/rust-lang/cargo/issues/10098>).

       -h, --help
           Prints help information.

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

ENVIRONMENT
       See the reference
       <https://doc.rust-lang.org/cargo/reference/environment-variables.html>
       for details on environment variables that Cargo reads.

EXIT STATUS
       o  0: Cargo succeeded.

       o  101: Cargo failed to complete.

EXAMPLES
       1. Output JSON about the current package:

              cargo metadata --format-version=1

SEE ALSO
       cargo(1), cargo-pkgid(1), Package ID Specifications
       <https://doc.rust-lang.org/cargo/reference/pkgid-spec.html>, JSON
       messages
       <https://doc.rust-lang.org/cargo/reference/external-tools.html#json-messages>

