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Front-End Package Manager Comparison

Why do this?

It is about time for front-end developers to have a decent package manager. Front-end development is serious business and there is no good reason for us to continue with sub-par tools or no tools at all.

I appreciate the effort that has gone into all of these. It is awesome to see really talented developers taking on the task and sharing the result with the rest of us.

The contenders

The following tools have caught my attention:


  • component is more of a concept and a framework for building and distributing front-end components. If you'd like to read more on this distinction, check out the issue #1 thread.
  • bower is meant to be consumed by higher-level tools and frameworks. What this means in practice is:
    • (1) bring your own CJS/AMD loader.
    • (2) bring your own build tool.
    • (3) bring your own organization conventions.
    • (4) ultimately, coupled with either make or grunt, bower looks like a viable option

What is a package manager?

A package manager is a tool that allows you to specify a list of dependencies for your library or application. The tools depicted here are similar in scope to Bundler, NPM, or Composer.

How is this thing evaluated?

Since tool choice is extremely subjective, you (and/or your team) should come up with your own weighting system and score each tool accordingly.

Configuration File

The following table provides the name of the "manifest" file where you specify dependencies and/or the details of your package.

Configuration bower component jam volo
filename component.json component.json package.json package.json

Sample bower enabled component.json file:

  "name": "project-name",
  "version": "x.x.x",
  "description": "A project description provided by the author",
  "homepage": "",
  "license" : "[PLEASE include a license URL if terms are included]",
  "main": [
  "dependencies": {
    "jquery": "~x.x.x"
  "keywords": [
  "author": {
    "name": "Tool Author",
    "web": ""

Sample component enabled component.json file:


  "name":        "tip",
  "repo":        "component/tip",
  "description": "Tip component",
  "version":     "0.0.1",
  "keywords":    ["tooltip", "tip", "ui"],
  "dependencies": {
    "component/emitter": "*",
    "component/jquery":  "*"
  "scripts": ["index.js", "template.js"],
  "styles":  ["tip.css"]


Sample jam enabled package.json file:


  "name":        "csbp",
  "version":     "0.0.1",
  "description": "A Non-Framework Client-Side JavaScript/HTML5 Project Boilerplate",

  "dependencies": {
    "jamjs":         "*",
    "grunt-contrib": "*"

  "devDependencies": {
    "chai":          "*",
    "mocha":         "*",
    "sinon":         "*",
    "grunt-mocha":   "*"

  "jam": {
    "packageDir": "src/libs/js",
    "baseUrl":    "src/main/js"


Sample volo enabled package.json file:


  "name":            "csbp",
  "version":         "0.0.1",
  "description":     "A Non-Framework Client-Side JavaScript/HTML5 Project Boilerplate",

  "dependencies": {

  "devDependencies": {
    "yeti":          "*",
    "docco":         "*",
    "jshint":        "*",
    "chai":          "*",
    "mocha":         "*",
    "sinon":         "*"

  "amd":  {},

  "volo": {
    "baseUrl":       "src/js/lib",

    "dependencies":  {
      "page":        "github:visionmedia/page.js",
      "requirejs":   "*"



  • bower lacks the notion of devDependencies. This is not an issue with the package managers that support package.json. There is an interesting discussion regarding some of the reasoning behind bower not supporting the well-known package.json format.
  • When using volo, I would suggest using the flags:
    • -nostamp: mitigates the reformating of your package.json file
    • skipexists: skip existing dependencies without noisy warnings

Package Installation Location

The following table details where each tool stores downloaded packages.

Path bower component jam volo
default path ./components ./components ./jam ./js, ./scripts, ./
custom path .bowerrc --out dir jam.packageDir volo.{baseDir,baseUrl}, amd.baseDir


volo has a fairly complex algorithm.

If not defined in package.json it:

  • Looks for a ./js directory
  • Looks for a ./scripts directory
  • Otherwise, the current working directory is used

Development Dependencies

The following table details whether each tool allows specifying development dependencies.

Development Dependencies bower component jam volo


  • Since jam and volo use package.json, this just works; however, component re-implments this functionality here.


The following table details the responsibilities the given tool takes on.

Responsibilities bower component jam volo
package management
project scaffolding
build automation
script/module loading



The following table details which tools require a build/compile step during development.

Build/Compile? bower component jam volo
? ✓ (component build)


  • N/A

Central Registry

The following table details which tools expose a central "registry".

Registry? bower component jam volo


Package installation sources

The following table details the method by which each tool is able to retrieve packages.

Source bower component jam volo
git / github ✓ (CLI ONLY)
private repositories ✗ (COMING SOON) ✓ (SEE NOTES BELOW)
zip / tarball ✓ (CLI ONLY) ✓ (ZIPBALL ONLY)


  • I've never been on a serious team where no support for private repositories would be acceptable. If this is important to you, it seems that your best options are currently bower and component.
  • While volo doesn't actually claim to have explicit support for private repositories, you can achieve the notion of private repositories by providing a URL to a single JavaScript source file (github and github:enterprise allow you to link to a raw file) or you can specify a URL to a zipball. There are a few more tricks that you can choose from listed here.


The following table details the speed of each tool.

Registry? bower component jam volo
~85 components ~80s ~10s ~80s ~80s


  • For most projects, speed won't be an issue; however, it may be more import for some.
  • These benchmarks were taken from the component documentation; thus depending on your setup and dependencies, YMMV.

Supported JavaScript Module formats

The following table details the JavaScript format each tool expects/handles.

Format bower component jam volo
Global Script
AMD ✓ (format agnostic)
CommonJS/NodeJS ✓ (format agnostic) ✓ (bundles require)
CommonJS (WRAPPED) ✓ (format agnostic)


There are several JavaScript formatting methodologies:

  • Global Script

     <script src="trim.js"></script>
        var todo = new Todo({description: '', done: false});
  • AMD

     define(['todo'], function(Todo){
        var todo = new Todo({description: '', done: false});
  • CommonJS/NodeJS

     var Todo = require('todo');
     var todo = new Todo({description: '', done: false});
  • CommonJS (wrapped in an AMD-style define)

        var Todo = require('todo');
        var todo = new Todo({description: '', done: false});


  • N/A

Module / Script Loader

The following table details the module/script loader supported by each tool.

Source bower component jam volo
Bring your own loader
Includes a Loader ✓ (custom require) ✓ (RequireJS)


Loaders that you might be interested in:

Package Contents

The following table details the the types of source files that can be contained in each package per tool.

Source bower component jam volo


  • N/A

Final thoughts

Each package manager is built by talented, responsive, and friendly developers. Ultimately, to evaluate for your team, you will have to put a weight on each category and score per your needs.

Library and component authors may want to consider:

  • Using a UMD wrapper.
  • Authoring both a {component,package}.json for front-end and npm (where appropriate).
  • Adhering to these Library best practices or something similar.

Complementary Resources

Below are a list of resources that will likely be useful to you if you found this comparison useful:


I am sure I've made a few gramatical and spelling errors. I've probably even made comparison errors in a few spots. Please feel free to speak up or submit a pull request.

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