Node.js framework for building Google Glass Mirror applications

Glass Prism

A Node.js framework and boilerplate for Google Glass Mirror applications.

npm install glass-prism

Create an application in the Google API Console. Here's a tutorial about that.

Example application:

var prism = require("glass-prism");
    "client_id": "",
    "client_secret": "kjsdlDKLJSSDLSDJsdkjsdkl",
    "redirect_dir": "http://localhost:8099/oauth2callback"
}, function() {
    console.log('Ready to roll!');
    prism.all.insertCard({ text: "Hello, world!" });
prism.on('newclient', function(tokens) {
    prism.insertCard({ html:"Hi!") }, tokens);

Prism automatically compiles together card templates for your use. Simply place HTML cards in cards/, and they will be converted into a doT template function stored in For example:

        <div class="text-auto-size">
                <span class='{{=it.cpuColor}}'>{{=it.avg}}</span>
            <p class='{{=it.memColor}}'>{{=it.memused}}/{{=it.memtotal}}mb</p>
var args = {
    uptime: 0,
    avg: 0,
    memtotal: 0,
    memused: 0,
    cpuColor: 'green',
    memColor: 'green',
    config: config
var html =;
prism.insertCard({ html: html }, tokens);

The Mirror API playground is a great place to create HTML for your cards.

More information about doT templates.

These are passed to the init function as a JSON object.

    /* required, obtain from the Google API console */
    "client_id": "",
    "client_secret": "",
    // should be set to point to this application's port and machine
    "redirect_dir": "",
    /* optional tweaking */
    // http interface. this is used to authorize via OAuth with the Google APIs
    "port": 8099,
    // default not set, can be a manual array of client tokens
    // if used, make sure refresh tokens are included!
    "clientTokens": null,
    // file that stores client tokens of users
    "tokenFileName": ".clienttokens.json",
    // disable scanning for card templates
    "noCardTemplates": null,
    // disable the HTTP interface. If this is set, client tokens will need to be provided
    "noHttpInterface": null,
    // whether or not we care about subscribers
    "subscribe": null,
    // if set, a contact interface for -post an update to- is created
    "displayName": null,
    // if subscriptions are used, this string is used to confirm that Google sent the
    // subscription
    "verify_hash": null,
    // this is the actual URL Google sends a POST request to. This *must* be publicly
    // accessible over HTTPS (with valid SSL working).
    // If you only care about sending stuff to the device, you can ignore this safely.
    "subscription_callback": null,
    // the phonetic name for the contact
    "speakableName": null,
    // an icon for the endpoint, shown in the Glass post menu
    "contactIcon": null,
    // if set, nothing will be output to the console
    "noOutputErrors": null

The following events are emitted from the framework:

newclient : a new client has connected. Passes tokens as the argument, an object containing the connect user's OAuth tokens

subscription : a subscription from the Google API has been received. Occurs when a card is replied to, deleted, pinned, etc.

function init(configinput, callback)

Used to initialize the Prism interface and discover the Google API endpoints. Executes callback(err) when completed.

insertCard(options, tokens, [callback])

Insert a card to the device authed with token, where token can be obtained from a [callback] or the client_tokens property. options is the JSON object to send to the Mirror API. callback is sent (err, data).

updateCard(options, tokens, [callback])

Update a card by sourceItemId. The card is first requested; if it does not exist, a new one is inserted. This is useful when you want to send information that will always be updated to the device. If options.isPinned is not set, it defaults to true, meaning new cards will always be inserted unless one is pinned. tokens and callback are the same as above.

deleteBundle(options, tokens, [callback])

Deletes a bundle by options.bundleId

deleteCard(options, tokens, [callback])

Deletes a card by id

patchCard(options, tokens, [callback])

Updates a card by id

mirrorCall(call, tokens, callback)

Places a call to the Mirror API, authenticated with token. call is a function returned from mirror, which contains discovered functions, i.e.

mirrorCall(mirror.timeline.list({ "sourceItemId": options.sourceItemId,
        "isPinned": options.isPinned || true }), tokens, callback);

An array of the client OAuth tokens.


Any of the above methods can be called with exports.all, which runs the command on all client tokens, and accepts (options, callback) as the arguments. E.g.:

prism.all.updateCard({ html: html, isPinned: true, sourceItemId: "gtop_"+config.hostname });

I built Prism so I could abstract out a lot of the code for my Mirror API projects, and as such have a few examples to share. More are welcome ;)

gtop - Server monitor Glass-Mint - banking information on Glass


I do stuff with Google Glass, Node.js, and Vim plugins. Follow me if that sounds like something you're into (or you just want to make my day!)