Go to main content

man pages section 1: User Commands

Exit Print View

Updated: Wednesday, July 27, 2022

cargo-metadata (1)


cargo-metadata - readable metadata about the current package


cargo metadata [options]


CARGO-METADATA(1)           General Commands Manual          CARGO-METADATA(1)

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

       cargo metadata [options]

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

       It is recommended to include the --format-version flag to future-proof
       your code to ensure the output is in the format you are expecting.

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

       The 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, a unique identifier for referring to the package. */
                       "id": "my-package 0.1.0 (path+file:///path/to/my-package)",
                       /* 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. This represents where
                          a package is retrieved from.
                          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"
                       "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
                       /* 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": [
                               /* 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": [
                               /* The name of the target. */
                               "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
                       "features": {
                           "default": [
                           "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": [
                       /* 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": [
                       /* Array of keywords from the manifest. */
                       "keywords": [
                       /* 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": [
                   "my-package 0.1.0 (path+file:///path/to/my-package)",
               // 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": "my-package 0.1.0 (path+file:///path/to/my-package)",
                           /* The dependencies of this package, an array of Package IDs. */
                           "dependencies": [
                               "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)"
                           /* 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": "bitflags",
                                   /* The Package ID of the dependency. */
                                   "pkg": "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
                                   /* 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": [
                   /* The root package of the workspace.
                      This is null if this is a virtual workspace. Otherwise it is
                      the Package ID of the root package.
                   "root": "my-package 0.1.0 (path+file:///path/to/my-package)"
               /* The absolute path to the build directory where Cargo places its output. */
               "target_directory": "/path/to/my-package/target",
               /* 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

   Output Options
           Output information only about the workspace members and don't fetch

       --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. 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
       for more details.

       --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.

           Activate all available features of all selected packages.

           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

       -q, --quiet
           No output printed to stdout.

       --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

   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.

       --frozen, --locked
           Either of these flags requires that the Cargo.lock file is
           up-to-date. If the lock file is missing, or it needs to be updated,
           Cargo will exit with an error. The --frozen flag also prevents
           Cargo from attempting to access the network to determine if it is

           These may be used in environments where you want to assert that the
           Cargo.lock file is up-to-date (such as a CI build) or want to avoid
           network access.

           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

   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
           <https://rust-lang.github.io/rustup/overrides.html> for more
           information about how toolchain overrides work.

       -h, --help
           Prints help information.

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

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

       o  0: Cargo succeeded.

       o  101: Cargo failed to complete.

        1. Output JSON about the current package:

               cargo metadata --format-version=1

       See attributes(7) for descriptions of the following attributes:

       |Availability   | developer/rust/cargo |
       |Stability      | Volatile             |


       Source code for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-

       This software was built from source available at
       https://github.com/oracle/solaris-userland. The original community
       source was downloaded from  https://static.rust-

       Further information about this software can be found on the open source
       community website at http://www.rust-lang.org/.