cargo metadata


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


cargo metadata [OPTIONS]


Output the resolved dependencies of a package, the concrete used versions including overrides, in JSON to stdout.

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 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+"
               - "git+URL" for git-based dependencies.
                 Example: "git+"
            "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. */
                    "source": "registry+",
                    /* 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)"
            /* 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/",
                    /* 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"]
            /* 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
            /* Array of authors from the manifest.
               Empty array if no authors specified.
            "authors": [
                "Jane Doe <>"
            /* 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": "",
            /* The repository value from the manifest or null if not specified. */
            "repository": "",
            /* 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, with the concrete versions and features
       selected. The set depends on the enabled features.
       This is null if --no-deps is specified.
    "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+"
                /* 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.
                           If this is a renamed dependency, this is the new
                        "name": "bitflags",
                        /* The Package ID of the dependency. */
                        "pkg": "bitflags 1.0.4 (registry+"
                /* 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"


Output Options


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.

Feature Selection

When no feature options are given, the default feature is activated for every selected package.

--features FEATURES

Space or comma separated list of features to activate. These features only apply to the current directory’s package. Features of direct dependencies may be enabled with <dep-name>/<feature-name> syntax.


Activate all available features of all selected packages.


Do not activate the default feature of the current directory’s package.

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.


No output printed to stdout.

--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.

Manifest Options

--manifest-path PATH

Path to the Cargo.toml file. By default, Cargo searches in the current directory or any parent directory for the Cargo.toml file.


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 out-of-date.

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.

Common Options


Prints help information.


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


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

Exit Status


Cargo succeeded.


Cargo failed to complete.


  1. Output JSON about the current package:

    cargo metadata --format-version=1