How do you keep your project dependencies updated? How do you update them in such a way that your older projects, which might not be compatible with the latest releases, aren’t affected? Managing all of your project dependencies manually is a full time job all on its own.
Without the proper tool. If you work on a lot of dev projects and you use third-party dependencies, using a package manager such as Bower is a must. This tutorial covers the basics of Bower.
This tutorial is geared towards front-end developers who are new to Bower, but are not new to command-line interfaces (CLIs). If you’re not comfortable with CLIs, Bower is an excellent and gentle introduction to them (compared to, say, jumping directly into managing your own web server/VPS through a command-line interface).
What is Bower?
Bower is a tool that helps you install, update, and manage all of your front-end development dependencies.
To install Bower, you’ll need:
- npm (which comes with Node by default)
If you don’t have Node (and npm) installed yet, you might want to read this tutorial first: How to Install Node.js. If you don’t have Git either, check out our tutorial called How to Quickly Get Started with Git — it’s written by Tobias Günther (who knows a thing or two about Git, given that his company built one of the most popular Git graphical user interfaces in the market). Once you have Node, npm, and Git ready to go, install Bower by running the following command in your command prompt/terminal:
npm install -g bower
The command above installs Bower globally, which means it will be accessible anywhere in your computer.
Just a funny aside, the command above is similar to using Mozilla Firefox to download Google Chrome. Anyways, moving on. Next, navigate to your project’s directory/folder.
This is important — and I want to say this early on in this tutorial — because the rest of the tutorial assumes you’re already in your project’s directory. If you don’t have one, just create a folder somewhere in your computer, name it something like “bower-tutorial” or “messing-around-with-bower” or whatever, and then navigate to it. You don’t want to be doing all of this in your Desktop folder or something.
Since this is probably your first time using Bower, the command I’d like to talk about first is the
help command, which displays inline docs and tips. Issuing the
help command without any arguments will show you a list of Bower commands.
If you want to learn about a particular Bower command, there are two ways to go about it.
The first is to issue the
help command followed by the name of the command you want to learn more about. For example, let’s say you want to learn about the
prune Bower command. We can do:
bower help prune
The other method is to type the command followed with the
-help (or its shortcut,
This way of displaying help documentation is useful when you’re typing a Bower command and then, midstream, you suddenly realize you’ve completely forgotten what the command does, or that you’d like to explore what its options are before issuing the command.
bower prune -help
The following is exactly the same as
bower prune -help, except we’re using the short version of the
-help option, which is
bower prune -h
By the way, Bower command options will often have shortened versions to make them easier to type. For example, the
--verbose option can also be written as
--force can be written as
Find Bower Packages to Install
To locate Bower packages you might want to install, you can use the
search command followed by a keyword or the package’s name. For example, if we’d like to look for packages tagged with the keyword “responsive”, we can issue this command:
bower search responsive
If you already know the name of the project you want to install and want to see if it’s available as a Bower package, you can type its name instead. The package name is equal to the project’s GitHub repository name.
For instance, if we’re interested in seeing if HTML5 Boilerplate has a Bower package, and we know that the project’s name is “html5-boilerplate”, we can type:
bower search html5-boilerplate
The command will return all the Bower packages that match the package name you’ve entered. If you’d rather use a web interface, you can hit up Bower’s search page.
Get Information on a Package
In the above example, you can see that Bower returned several results when we did our
If you’re not sure which package you want, or if you’d like to learn more about a particular package, issue the
info command followed by the package name. Let’s output some information on Bootstrap.
bower info bootstrap
The command will display the contents of the
bower.json manifest file of the package — we will talk about
bower.json later on — which typically contains details like the package’s official site, a description of the project, the project’s license, keywords, other available version releases, etc.
Installing Bower Packages
The main way to get Bower packages into your project is through the
install command followed by the package name you want to install. All the packages you install will go into a folder called
bower_components that will be automatically created in your project’s folder. Let’s grab the jQuery package.
We can do so using this command:
bower install jquery
The command will get the latest version of jQuery.
Installing a Specific Version
By default the
install command will get the latest version of the package. But if you want to use another version, you can specify the version name.
Perhaps you’re feeling a bit adventurous, and would like to use a not-yet-stable release candidate version, or maybe you want to use an older version that’s compatible with an old project you’re working on, or you’re doing some sort of backwards-compatibility testing. To do this, we just need to specify the version number, preceded by a hash (
#). I recommend issuing the
info command first so you can see all the available versions of the package.
bower info jquery, for example, revealed several available versions of jQuery. If we wanted to install an old version, like version 1.11 for example, then this is the command we’d use:
bower install jquery#1.11
Setting Up Your Own Bower Package
A lot of us use the same set of dependencies in our development projects. And some of us even have multiple sets of dependencies, like one set for our personal projects and another set for work-related projects.
You may have found yourself always using the same third-party dependencies — Sass to write CSS, Angular for front-end functionality, HTML5shiv to support old browsers, etc. — throughout your different development projects. It would therefore be more efficient and manageable to set up a sort of template for your dependencies.
We can do this by creating our own custom Bower package. This is done by creating a manifest file called
bower.json in the root folder of your project. You can create
bower.json manually using a text editor or source code editor, but it’s just more convenient to do this through the command line using the
init command will give you prompts for filling out details about your Bower package, such as its name, version, description, etc. If you already have other Bower packages installed prior to running the
init command, Bower will ask you if you want to include them as dependencies in your
bower.json file. Next, we will include other packages to our own Bower package by specifying them as dependencies.
We do this by issuing the
install command with the
--save option (or its shortcut
-S) to let Bower know we want to include the package we’re installing in our
bower.json manifest file. Let’s set up the package to include jQuery, Normalize.css, and HTML5shiv.
bower install jQuery --save
bower install normalize.css -S
bower install html5shiv --save
Note: For developer tools such as code linters, CSS compressors, and unit tests — i.e.
packages that are only used during development — use the
--save-dev option instead. This will include the package in your
bower.json as a developer-dependency (which are listed under the
devDependencies JSON object in your manifest file). Now whenever you want to install your packages in another web development project, just use the Bower
install command followed by the location of your custom Bower package.
Then, if you want to customize your packages for that new project, you can modify its
bower.json file. If you would like to configure your
bower.json file manually, or add other settings beyond the ones created by
bower init, read Bower’s JSON specifications.
Useful Bower Commands
Here are a few other basic commands that will surely help.
(To see all the Bower commands, go to Bower’s list of commands.)
See All of Your Bower Packages
If you’ve stepped away too long from a dev project — let’s say you’re doing maintenance or redesign work for a client a couple of years down the line — a useful command that will remind you which packages you used in the project is the
What’s great about this command is Bower will also check to see if there are new versions of your packages available. Below, you can see that there are new versions of the packages I’m using:
Updating Your Packages
It’s crucial to, at the bare minimum, update your third-party dependencies whenever there’s a security patch.
Doing this manually across all of your dev projects (to put it mildly) is quite time-consuming, tedious, and error-prone. But with Bower, all you need to do is issue the
update command. To update a specific package, just use the
update command followed by the package name.
Let’s update jQuery:
bower update jquery
update command without any options or a package-name argument, Bower assumes you want to update all outdated packages.
Uninstall Bower Packages
If you want to remove a package, just use the
bower uninstall jquery
If you want to remove a package from your
bower.json list of dependencies, use the
uninstall command with the
bower uninstall html5shiv --save
In this tutorial, we covered the basics of Bower. This tutorial covered the following:
- Installing Bower
- Displaying help docs for Bower commands and options
- Finding and getting information about Bower packages
- Installing Bower packages
- How to create your own Bower package
- Other useful Bower commands for managing your project dependencies (listing, updating, and uninstalling)
In other tutorials, we’ll be exploring intermediate and advanced Bower features such customizing your Bower configuration and Bower’s Programmatic API.
- Speed Up Your Web Development Workflow with Grunt
- Why You Should Use Git
- Why I Ditched Angular for React
Jacob Gube is the founder of Six Revisions. He’s a front-end developer. Connect with him on Twitter.
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