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<h1 class="page_title">Packaged Apps</h1>
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<h2>Contents</h2>
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<li>
<a href="#overview">Overview</a>
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</li><li>
<a href="#manifest"> The manifest </a>
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<div id="static"><div id="pageData-name" class="pageData">Packaged Apps</div>
<div id="pageData-showTOC" class="pageData">true</div>
<p>
This page talks about packaged apps—how
you implement them,
and how they're different from
extensions and ordinary web apps.
</p>
<h2 id="overview">Overview</h2>
<p>
A packaged app is a web app
that's bundled into a <code>.crx</code> file
and can use Chrome extension features.
You build a packaged app just like you build an extension,
except that a packaged app can't include a
<a href="browserAction.html">browser action</a> or
<a href="pageAction.html">page action</a>.
Instead, a packaged app includes at least one HTML file
within its <code>.crx</code> file
that provides the app's user interface.
</p>
<p>
Packaged apps are a type of
<a href="http://code.google.com/chrome/apps/">installable web app</a>—a
web app that can be installed in Chrome.
The other type of installable web app is a
<a href="http://code.google.com/chrome/apps/docs/developers_guide.html">hosted app</a>,
which is an ordinary web app with a bit of additional metadata.
</p>
<p>
If you're developing a web app for the Chrome Web Store,
you might want to use a packaged app
instead of a hosted app if any of the following are true:
</p>
<ul>
<li>
You don't want to run a service to host your app.
</li>
<li>
You want to build an app that works really well offline.
</li>
<li>
You want tighter integration with Chrome,
using the extension APIs.
</li>
</ul>
<p>
To learn more about
the differences between web apps and websites,
extensions and packaged apps, and packaged apps and hosted apps,
read these:
</p>
<ul>
<li> <a href="http://code.google.com/chrome/webstore/docs/choosing.html">Choosing an App Type</a> </li>
<li> <a href="http://code.google.com/chrome/apps/articles/thinking_in_web_apps.html">Thinking in Web Apps</a> </li>
<li> <a href="http://code.google.com/chrome/webstore/articles/apps_vs_extensions.html">Extensions, Packaged Apps, and Hosted Apps in the Chrome Web Store</a> </li>
</ul>
<h2 id="manifest"> The manifest </h2>
<p>
A packaged app's manifest can have any field
that's available to extensions,
except for "browser_action" and "page_action".
In addition, a packaged app's manifest <b>must</b>
have an "app" field.
Here is a typical manifest for a packaged app:
</p>
<pre>{
"name": "My Awesome Racing Game",
"description": "Enter a world where a Vanagon can beat a Maserati",
"version": "1",
<b>"app": {
"launch": {
"local_path": "main.html"
}
},</b>
"icons": {
"16": "icon_16.png",
"128": "icon_128.png"
}
}
</pre>
<p>
The "app" field has one subfield, "launch",
which specifies the <em>launch page</em> for the app—the
page (HTML file bundled into the <code>.crx</code> file)
that the browser goes to when the user clicks the app's icon
in the New Tab page.
The "launch" field can contain the following:
</p>
<dl>
<dt>local_path:</dt>
<dd><em>Required.</em>
Specifies the launch page
as a relative path referring to a file
in the <code>.crx</code> package.
</dd>
<dt>container:</dt>
<dd> The value "panel" makes the app appear
in an app panel.
By default, or when you specify "tab",
the app appears in a tab.
<!-- PENDING: In the overview
(or somewhere else before here)
we should show and define both app panels and tabs.
We should link to that place from here. -->
</dd>
<dt>height:</dt>
<dd>
If the container is set to "panel",
this integer specifies the height
of the panel in pixels.
For example, you might specify
<code>"height":400</code>.
Note that you don't use quotation marks in the value.
This field specifies the height of the area
to display contents in;
window decorations add a few more pixels to the total height.
If the container isn't a panel, this field is ignored.
</dd>
<dt>width:</dt>
<dd>
Similar to "height",
but specifies the width of the panel.
</dd>
</dl>
<p>
Packaged apps usually provide a 16x16 icon
to be used as the favicon for
tabs that contain app's pages.
They also should provide a 128x128 icon,
but not a 48x48 icon.
See the manifest documentation for the
<a href="manifest.html#icons">"icons" field</a>
for more information.
</p>
<p>
For further details on what a packaged app's manifest can contain, see the
<a href="manifest.html">manifest documentation</a>.
</p>
<h2 id="next">What next?</h2>
<p>
Read the <a href="overview.html">Overview</a> to learn
basic concepts about extensions.
</p>
<p class="backtotop"><a href="#top">Back to top</a></p>
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