# cargo-tree
[](https://circleci.com/gh/sfackler/cargo-tree) [](https://crates.io/crates/cargo-tree)
`cargo tree` is a Cargo subcommand that visualizes a crate's dependency graph
in a tree-like format.
Requirements: `cmake` and `openssl`.
* macOS (via [homebrew](http://brew.sh/)): `brew install cmake openssl`
* Debian/Ubuntu: `apt install cmake libssl-dev pkg-config`
Install it with Cargo:
```
$ cargo install cargo-tree
```
In its default mode, `cargo tree` will print the "normal" dependencies of the
local crate:
```
$ cargo tree
postgres v0.10.2 (file:///Volumes/git/rust/rust-postgres)
├── bufstream v0.1.1
├── byteorder v0.4.2
├── hex v0.1.0
├── log v0.3.4
│ └── libc v0.2.4
├── net2 v0.2.20
│ ├── cfg-if v0.1.0
│ ├── kernel32-sys v0.2.1
│ │ └── winapi v0.2.5
│ ├── libc v0.2.4 (*)
│ ├── winapi v0.2.5 (*)
│ └── ws2_32-sys v0.2.1
│ └── winapi v0.2.5 (*)
└── phf v0.7.9
└── phf_shared v0.7.9
```
Crates will only have their dependencies displayed the first time they are
shown - further copies will have a `(*)` appended to indicate that their output
has been truncated.
Like other `cargo` subcommands, features can be enabled via the `--features`
flag:
```
$ cargo tree --features serde_json
postgres v0.10.2 (file:///Volumes/git/rust/rust-postgres)
├── bufstream v0.1.1
├── byteorder v0.4.2
├── hex v0.1.0
├── log v0.3.4
│ └── libc v0.2.4
├── net2 v0.2.20
│ ├── cfg-if v0.1.0
│ ├── kernel32-sys v0.2.1
│ │ └── winapi v0.2.5
│ ├── libc v0.2.4 (*)
│ ├── winapi v0.2.5 (*)
│ └── ws2_32-sys v0.2.1
│ └── winapi v0.2.5 (*)
├── phf v0.7.9
│ └── phf_shared v0.7.9
└── serde_json v0.6.0
├── num v0.1.29
│ ├── rand v0.3.12
│ │ ├── advapi32-sys v0.1.2
│ │ │ └── winapi v0.2.5 (*)
│ │ ├── libc v0.2.4 (*)
│ │ └── winapi v0.2.5 (*)
│ └── rustc-serialize v0.3.16
└── serde v0.6.7
└── num v0.1.29 (*)
```
`cargo tree` can also operate in an "inverse" mode where the dependency tree is
walked backwards. This is most often useful when trying to determine where
a certain crate is coming from. The `--package` or `-p` flag selects the crate
to use as the root of the tree and the `--invert` or `-i` flag inverts the
dependency graph traversal:
```
$ cargo tree --features serde_json -p libc -i
libc v0.2.4
├── log v0.3.4
│ └── postgres v0.10.2 (file:///Volumes/git/rust/rust-postgres)
├── net2 v0.2.20
│ └── postgres v0.10.2 (file:///Volumes/git/rust/rust-postgres) (*)
└── rand v0.3.12
└── num v0.1.29
├── serde v0.6.7
│ └── serde_json v0.6.0
│ └── postgres v0.10.2 (file:///Volumes/git/rust/rust-postgres) (*)
└── serde_json v0.6.0 (*)
```
More options are available - see the output of `cargo tree --help` for details.