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# ntfy
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2021-10-24 03:29:45 +02:00
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ntfy (pronounce: *notify*) is a super simple pub-sub notification service. It allows you to send desktop and (soon) phone notifications
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via scripts. I run a free version of it on *[ntfy.sh](https://ntfy.sh)*. **No signups or cost.**
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## Usage
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### Subscribe to a topic
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You can subscribe to a topic either in a web UI, or in your own app by subscribing to an
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[SSE](https://en.wikipedia.org/wiki/Server-sent_events)/[EventSource](https://developer.mozilla.org/en-US/docs/Web/API/EventSource),
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or a JSON or raw feed.
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Here's how to see the raw/json/sse stream in `curl`. This will subscribe to the topic and wait for events.
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```
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# Subscribe to "mytopic" and output one message per line (\n are replaced with a space)
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curl -s ntfy.sh/mytopic/raw
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# Subscribe to "mytopic" and output one JSON message per line
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curl -s ntfy.sh/mytopic/json
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# Subscribe to "mytopic" and output an SSE stream (supported via JS/EventSource)
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curl -s ntfy.sh/mytopic/sse
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```
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You can easily script it to execute any command when a message arrives. This sends desktop notifications (just like
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the web UI, but without it):
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```
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while read msg; do
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notify-send "$msg"
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done < <(stdbuf -i0 -o0 curl -s ntfy.sh/mytopic/raw)
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```
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### Publish messages
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Publishing messages can be done via PUT or POST using. Here's an example using `curl`:
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```
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curl -d "long process is done" ntfy.sh/mytopic
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```
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2021-10-24 03:29:45 +02:00
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Messages published to a non-existing topic or a topic without subscribers will not be delivered later. There is (currently)
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no buffering of any kind. If you're not listening, the message won't be delivered.
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## FAQ
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### Isn't this like ...?
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Probably. I didn't do a whole lot of research before making this.
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### Can I use this in my app?
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Yes. As long as you don't abuse it, it'll be available and free of charge.
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### What are the uptime guarantees?
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Best effort.
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### Why is the web UI so ugly?
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I don't particularly like JS or dealing with CSS. I'll make it pretty after it's functional.
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## TODO
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- rate limiting / abuse protection
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- release/packaging
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- add HTTPS
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## Contributing
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I welcome any and all contributions. Just create a PR or an issue.
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## License
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Made with ❤️ by [Philipp C. Heckel](https://heckel.io), distributed under the [Apache License 2.0](LICENSE).
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