Can slack incoming webhooks post message to all private groups?

Question

I was searching if slack incoming webhooks can send message to all private groups, but I didn't find any slack documentation on that.

So, can slack incoming webhooks send message to all private groups?

Solution

Incoming webooks can post to private groups. When you set up the incoming webhook at https://TEAM.slack.com/services/new/incoming-webhook, choose the private group you want to send to.

You can send to a different channel (including a different private group) with the "channel" JSON key.

A single incoming webhook cannot send to multiple destinations.

Comments

[Julian B.]

A single incoming webhook cannot send to multiple destinations. Is this still the case?

[Merlin83b]

It is. The channel JSON key is a single string, not an array of channels to send the message to.

[Konstantin Suvorov]

Not to multiple destinations at once, but you can set different channel value for different hook calls.

[Erik Kalkoken]

Note that there are two types of "incoming webhook" now. The default type is create as part of a Slack app, and the legacy type needs to be installed as app from the Slack App Directory. Only the legacy type supports multiple destinations.

[OrangeDog]

But can you still sent to a private channel, even if you didn't select it during setup?

[Levi Putna]

Does the person creating the webhook need to be a member of the private channel?

[Cristiano Santos]

@LeviPutna If the user is not a member of the channel, the webhook fails with an error of "channel_not_found"