Incoming webhook integrations
An incoming webhook allows a third-party service to push data to Zulip when
something happens. There's two ways to do an incoming webhook in
- Use our REST API endpoint for sending
messages. This works great for internal tools
or cases where the third-party tool wants to control the formatting
of the messages in Zulip.
- Adding an incoming webhook integration (detailed on this page),
where all the logic for formatting the Zulip messages lives in the
Zulip server. This is how most of Zulip's official
integrations work, because they enable Zulip to
support third-party services that just have an "outgoing webhook"
feature (without the third party needing to do any work specific to
In an incoming webhook integration, the third-party service's
"outgoing webhook" feature sends an
HTTP POSTs to a special URL when
it has something for you, and then the Zulip "incoming webhook"
integration handles that incoming data to format and send a message in
New official Zulip webhook integrations can take just a few hours to
write, including tests and documentation, if you use the right
Set up the
Zulip development environment.
Use https://webhook.site/ or a similar site to capture an example
webhook payload from the third-party service. Create a
zerver/webhooks/<mywebhook>/fixtures/ directory, and add the captured
payload as a test fixture.
Integration object, and add it to
zerver/lib/integrations.py. Search for
webhook in that file to find an
existing one to copy.
Write a draft webhook handler under
zerver/webhooks/. There are a lot of
examples in that directory that you can copy. We recommend templating off
a short one, like
Add a test for your fixture at
Run the tests for your integration like this:
Iterate on debugging the test and webhooks handler until it all
Capture payloads for the other common types of
POSTs the third-party
service will make, and add tests for them; usually this part of the
process is pretty fast.
Document the integration (required for getting it merged into Zulip). You
can template off an existing guide, like
This should not take more than 15 minutes, even if you don't speak English
as a first language (we'll clean up the text before merging).
Hello world walkthrough
Check out the detailed walkthrough for step-by-step
Files that need to be created
Select a name for your incoming webhook and use it consistently. The examples
below are for a webhook named
zerver/webhooks/mywebhook/__init__.py: Empty file that is an obligatory
part of every python package. Remember to
git add it.
zerver/webhooks/mywebhook/view.py: The main webhook integration function
as well as any needed helper functions.
zerver/webhooks/mywebhook/fixtures/messagetype.json: Sample json payload data
used by tests. Add one fixture file per type of message supported by your
zerver/webhooks/mywebhook/tests.py: Tests for your webbook.
zerver/webhooks/mywebhook/doc.html: End-user documentation explaining
how to add the integration.
static/images/integrations/logos/mywebhook.svg: A square logo for the
platform/server/product you are integrating. Used on the documentation
pages as well as the sender's avatar for messages sent by the integration.
static/images/integrations/mywebbook/001.svg: A screenshot of a message
sent by the integration, used on the documenation page.
Files that need to be updated
zerver/lib/integrations.py: Add your integration to
WEBHOOK_INTEGRATIONS. This will automatically register a
URL for the incoming webhook of the form
associate it with the function called
Consider using our Zulip markup to make the output from your
integration especially attractive or useful (e.g. emoji, markdown
emphasis, @-mentions, or
Use topics effectively to ensure sequential messages about the same
thing are threaded together; this makes for much better consumption
by users. E.g. for a bug tracker integration, put the bug number in
the topic for all messages; for an integration like Nagios, put the
service in the topic.
Integrations that don't match a team's workflow can often be
uselessly spammy. Give careful thought to providing options for
triggering Zulip messages only for certain message types, certain
projects, or sending different messages to different streams/topics,
to make it easy for teams to configure the integration to support
Consistently capitalize the name of the integration in the
documentation and the Client name the way the vendor does. It's OK
to use all-lower-case in the implementation.
Sometimes it can be helpful to contact the vendor if it appears they
don't have an API or webhook we can use; sometimes the right API
is just not properly documented.
A helpful tool for testing your integration is
UltraHook, which allows you to receive webhook
calls via your local Zulip development environment. This enables you to do end-to-end
testing with live data from the service you're integrating and can help you
spot why something isn't working or if the service is using custom HTTP