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<h1><img src="static/img/ntfy.png" alt="ntfy"/><br/>ntfy.sh | simple HTTP-based pub-sub</h1>
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<p>
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<b>Ntfy</b> (pronounce: <i>notify</i>) is a simple HTTP-based <a href="https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern">pub-sub</a> notification service.
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It allows you to send notifications <a href="https://play.google.com/store/apps/details?id=io.heckel.ntfy">to your phone</a> or desktop via scripts from any computer,
entirely <b>without signup or cost</b>. It's also <a href="https://github.com/binwiederhier/ntfy">open source</a> if you want to run your own.
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</p>
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<div id="screenshots">
<a href="static/img/screenshot-curl.png"><img src="static/img/screenshot-curl.png"/></a>
<a href="static/img/screenshot-web-detail.png"><img src="static/img/screenshot-web-detail.png"/></a>
<span class="nowrap">
<a href="static/img/screenshot-phone-main.jpg"><img src="static/img/screenshot-phone-main.jpg"/></a>
<a href="static/img/screenshot-phone-detail.jpg"><img src="static/img/screenshot-phone-detail.jpg"/></a>
<a href="static/img/screenshot-phone-notification.jpg"><img src="static/img/screenshot-phone-notification.jpg"/></a>
</span>
</div>
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<p>
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There are many ways to use Ntfy. You can send yourself messages for all sorts of things: When a long process finishes or fails (a backup, a long rsync job, ...),
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or to notify yourself when somebody logs into your server(s). Or you may want to use it in your own app to distribute messages to subscribed clients.
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Endless possibilities 😀. Be sure to check out the <a href="https://github.com/binwiederhier/ntfy/tree/main/examples">example on GitHub</a>!
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</p>
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<h2>Publishing messages</h2>
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<p>
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Publishing messages can be done via PUT or POST using. Topics are created on the fly by subscribing or publishing to them.
Because there is no sign-up, <b>the topic is essentially a password</b>, so pick something that's not easily guessable.
</p>
<p class="smallMarginBottom">
Here's an example showing how to publish a message using <tt>curl</tt>:
</p>
<code>
curl -d "long process is done" ntfy.sh/mytopic
</code>
<p class="smallMarginBottom">
Here's an example in JS with <tt>fetch()</tt> (see <a href="https://github.com/binwiederhier/ntfy/tree/main/examples">full example</a>):
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</p>
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<code>
fetch('https://ntfy.sh/mytopic', {<br/>
method: 'POST', // PUT works too<br/>
body: 'Hello from the other side.'<br/>
})
</code>
<h2>Subscribe to a topic</h2>
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<p>
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You can create and subscribe to a topic either in this web UI, or in your own app by subscribing to an
<a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource">EventSource</a>, a JSON feed, or raw feed.
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</p>
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<div id="subscribeBox">
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<h3>Subscribe in this Web UI</h3>
<p id="error"></p>
<p>
Subscribe to topics here and receive messages as <b>desktop notification</b>. Topics are not password-protected,
so choose a name that's not easy to guess. Once subscribed, you can publish messages via PUT/POST.
</p>
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<form id="subscribeForm">
<p>
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<b>Topic:</b><br/>
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<input type="text" id="topicField" autocomplete="off" placeholder="Topic name, e.g. phil_alerts" maxlength="64" pattern="[-_A-Za-z0-9]{1,64}" />
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<button id="subscribeButton">Subscribe</button>
</p>
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<p id="topicsHeader"><b>Subscribed topics:</b></p>
<ul id="topicsList"></ul>
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</form>
<audio id="notifySound" src="static/sound/mixkit-message-pop-alert-2354.mp3"></audio>
</div>
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<h3>Subscribe via Android App</h3>
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<p>
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You can use the <a href="https://play.google.com/store/apps/details?id=io.heckel.ntfy">Ntfy Android App</a>
to receive notifications directly on your phone. Just like the server, this app is also <a href="https://github.com/binwiederhier/ntfy-android">open source</a>.
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</p>
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<h3>Subscribe via your app, or via the CLI</h3>
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<p class="smallMarginBottom">
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Using <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource">EventSource</a> in JS, you can consume
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notifications like this (see <a href="https://github.com/binwiederhier/ntfy/tree/main/examples">full example</a>):
</p>
<code>
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const eventSource = new EventSource('https://ntfy.sh/mytopic/sse');<br/>
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eventSource.onmessage = (e) => {<br/>
// Do something with e.data<br/>
};
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</code>
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<p class="smallMarginBottom">
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You can also use the same <tt>/sse</tt> endpoint via <tt>curl</tt> or any other HTTP library:
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</p>
<code>
$ curl -s ntfy.sh/mytopic/sse<br/>
event: open<br/>
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data: {"id":"weSj9RtNkj","time":1635528898,"event":"open","topic":"mytopic"}<br/><br/>
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data: {"id":"p0M5y6gcCY","time":1635528909,"event":"message","topic":"mytopic","message":"Hi!"}<br/><br/>
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event: keepalive<br/>
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data: {"id":"VNxNIg5fpt","time":1635528928,"event":"keepalive","topic":"test"}
</code>
<p class="smallMarginBottom">
To consume JSON instead, use the <tt>/json</tt> endpoint, which prints one message per line:
</p>
<code>
$ curl -s ntfy.sh/mytopic/json<br/>
{"id":"SLiKI64DOt","time":1635528757,"event":"open","topic":"mytopic"}<br/>
{"id":"hwQ2YpKdmg","time":1635528741,"event":"message","topic":"mytopic","message":"Hi!"}<br/>
{"id":"DGUDShMCsc","time":1635528787,"event":"keepalive","topic":"mytopic"}
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</code>
<p class="smallMarginBottom">
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Or use the <tt>/raw</tt> endpoint if you need something super simple (empty lines are keepalive messages):
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</p>
<code>
$ curl -s ntfy.sh/mytopic/raw<br/>
<br/>
This is a notification
</code>
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<p class="smallMarginBottom">
Here's an example of how to use this endpoint to send desktop notifications for every incoming message:
</p>
<code>
while read msg; do<br/>
[ -n "$msg" ] && notify-send "$msg"<br/>
done < <(stdbuf -i0 -o0 curl -s ntfy.sh/mytopic/raw)
</code>
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<h3>Message buffering and polling</h3>
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<p class="smallMarginBottom">
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Messages are buffered in memory for a few hours to account for network interruptions of subscribers.
You can read back what you missed by using the <tt>since=...</tt> query parameter. It takes either a
duration (e.g. <tt>10m</tt> or <tt>30s</tt>) or a Unix timestamp (e.g. <tt>1635528757</tt>):
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</p>
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<code>
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$ curl -s "ntfy.sh/mytopic/json?since=10m"<br/>
# Same output as above, but includes messages from up to 10 minutes ago
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</code>
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<p class="smallMarginBottom">
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You can also just poll for messages if you don't like the long-standing connection using the <tt>poll=1</tt>
query parameter. The connection will end after all available messages have been read. This parameter has to be
combined with <tt>since=</tt>.
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</p>
<code>
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$ curl -s "ntfy.sh/mytopic/json?poll=1&since=10m"<br/>
# Returns messages from up to 10 minutes ago and ends the connection
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</code>
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<h2>FAQ</h2>
<p>
<b>Isn't this like ...?</b><br/>
Who knows. I didn't do a lot of research before making this. It was fun making it.
</p>
<p>
<b>Can I use this in my app? Will it stay free?</b><br/>
Yes. As long as you don't abuse it, it'll be available and free of charge. I do not plan on monetizing
the service.
</p>
<p>
<b>What are the uptime guarantees?</b><br/>
Best effort.
</p>
<p>
<b>Will you know what topics exist, can you spy on me?</b><br/>
If you don't trust me or your messages are sensitive, run your own server. It's <a href="https://github.com/binwiederhier/ntfy">open source</a>.
That said, the logs do not contain any topic names or other details about you. Check the code if you don't believe me.
</p>
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<p>
<b>Why is Firebase used?</b><br/>
In addition to caching messages locally and delivering them to long-polling subscribers, all messages are also
published to Firebase Cloud Messaging (FCM) (if <tt>FirebaseKeyFile</tt> is set, which it is on ntfy.sh). This
is to facilitate instant notifications on Android. I tried really, really hard to avoid using FCM, but newer
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versions of Android made it impossible to implement <a href="https://developer.android.com/guide/background">background services</a>.
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</p>
<h2>Privacy policy</h2>
<p>
Neither the server nor the app record any personal information, or share any of the messages and topics with
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any outside service. All data is exclusively used to make the service function properly. The one exception
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is the Firebase Cloud Messaging (FCM) service, which is required to provide instant Android notifications (see
FAQ for details).
</p>
<p>
The web server does not log or otherwise store request paths, remote IP addresses or even topics or messages,
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aside from a short on-disk cache (up to a day) to support service restarts.
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</p>
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<center id="ironicCenterTagDontFreakOut"><i>Made with ❤️ by <a href="https://heckel.io">Philipp C. Heckel</a></i></center>
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</div>
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<div id="detail"{{if not .Topic}} style="display: none"{{end}}>
<div id="detailMain">
<button id="detailCloseButton"><img src="static/img/close_black_24dp.svg"/></button>
<h1><img src="static/img/ntfy.png" alt="ntfy"/><br/><span id="detailTitle"></span></h1>
<p class="smallMarginBottom">
<b>Ntfy</b> is a simple HTTP-based pub-sub notification service. This is a Ntfy topic.
To send notifications to it, simply PUT or POST to the topic URL. Here's an example using <tt>curl</tt>:
</p>
<code>
curl -d "Backup failed" <span id="detailTopicUrl"></span>
</code>
<p id="detailNotificationsDisallowed">
If you'd like to receive desktop notifications when new messages arrive on this topic, you have
<a href="#" onclick="return requestPermission()">grant the browser permission</a> to show notifications.
Click the link to do so.
</p>
<p class="smallMarginBottom">
<b>Recent notifications</b> (cached for {{.CacheDuration}}):
</p>
<p id="detailNoNotifications">
<i>You haven't received any notifications for this topic yet.</i>
</p>
<div id="detailEventsList"></div>
</div>
</div>
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