MaDGe - Module Dependency Graph

Madge is a developer tool for generating a visual graph of your module dependencies, finding circular dependencies, and give you other useful info. Joel Kemp's awesome dependency-tree is used for extracting the dependency tree.

• Works for JavaScript (AMD, CommonJS, ES6 modules) and CSS preprocessors (Sass, Stylus)
• NPM installed dependencies are excluded by default (can be enabled in config)
• All core Node.js modules (assert, path, fs, etc) are excluded
• Recurse into child dependencies to get a complete dependency tree of a file

Read the changelog for latest changes.

Examples

Graph generated from the madge's own code and dependencies.

A graph with circular dependencies. Blue has dependencies, green has no dependencies, and red has circular dependencies.

See it in action

Installation

$ npm -g install madge

Graphviz (optional)

Only required if you want to generate the visual graphs using Graphviz.

Mac OS X

$ brew install graphviz || port install graphviz

Ubuntu

$ apt-get install graphviz

API

madge(path: string|array, config: object)

path is a single file or directory to read (or an array of files/directories).

config is optional and should be configuration to be used.

Returns a Promise resolved with the Madge instance object.

Functions

.obj()

Returns an Object with all dependencies.

const madge = require('madge');

madge('path/to/app.js').then((res) => {
    console.log(res.obj());
});

.circular()

Returns an Array with all modules that has circular dependencies.

const madge = require('madge');

madge('path/to/app.js').then((res) => {
    console.log(res.circular());
});

.depends()

Returns an Array with all modules that depends on a given module.

const madge = require('madge');

madge('path/to/app.js').then((res) => {
    console.log(res.depends());
});

.dot()

Returns a Promise resolved with a DOT representation of the module dependency graph.

const madge = require('madge');

madge('path/to/app.js')
    .then((res) => res.dot())
    .then((output) => {
        console.log(output);
    });

.image(imagePath: string)

Write the graph as an image to the given image path. The image format to use is determined from the file extension. Returns a Promise resolved with a full path to the written image.

const madge = require('madge');

madge('path/to/app.js')
    .then((res) => res.image('path/to/image.svg'))
});

Configuration

Note that when running the CLI it's possible to use a runtime configuration file. The config should placed in .madgerc in your project or home folder. Look here for alternative locations for the file. Here's an example:

{
    "showFileExtension": true,
    "fontSize": "10px",
    "graphVizOptions": {
        "G": {
            "rankdir": "LR"
        }
    }
}

CLI

Examples

List dependencies from a single file

$ madge path/src/app.js

List dependencies from multiple files

$ madge path/src/foo.js path/src/bar.js

List dependencies from all *.js files found in a directory

$ madge path/src

List dependencies from multiple directories

$ madge path/src/foo path/src/bar

List dependencies from all *.js and *.jsx files found in a directory

$ madge --extensions js,jsx path/src

Finding circular dependencies

$ madge --circular path/src/app.js

Show modules that depends on a given module

$ madge --depends 'wheels' path/src/app.js

Excluding modules

$ madge --exclude '^(foo|bar)$' path/src/app.js

Save graph as a SVG image (graphviz required)

$ madge --image graph.svg path/src/app.js

Save graph as a DOT file for further processing (graphviz required)

$ madge --dot path/src/app.js > graph.gv

Debugging

To enable debugging output if you encounter problems, run madge with the --debug option then throw the result in a gist when creating issues on GitHub.

$ madge --debug path/src/app.js

Running tests

$ npm test

FAQ

What's the "Error: write EPIPE" when exporting graph to image?

Ensure you have Graphviz installed. And if you're running Windows graphviz is not setting PATH variable during install. You should add folder of gvpr.exe (typically %Graphviz_folder%/bin) to PATH variable.

The image produced by madge is very hard to read, what's wrong?

Try running madge with a different layout, here's a list of the ones you can try:

• dot "hierarchical" or layered drawings of directed graphs. This is the default tool to use if edges have directionality.

• neato "spring model'' layouts. This is the default tool to use if the graph is not too large (about 100 nodes) and you don't know anything else about it. Neato attempts to minimize a global energy function, which is equivalent to statistical multi-dimensional scaling.

• fdp "spring model'' layouts similar to those of neato, but does this by reducing forces rather than working with energy.

• sfdp multiscale version of fdp for the layout of large graphs.

• twopi radial layouts, after Graham Wills 97. Nodes are placed on concentric circles depending their distance from a given root node.

• circo circular layout, after Six and Tollis 99, Kauffman and Wiese 02. This is suitable for certain diagrams of multiple cyclic structures, such as certain telecommunications networks.

License

MIT License