n8n + Slack
Post to Slack from n8n
Send Slack messages from n8n to BrokenPost. Your workflow builds the message, BrokenPost posts it to Slack at the time you set.
How to connect n8n to Slack
- 1
Connect Slack in BrokenPost. Add BrokenPost to your Slack workspace and pick a channel for each post.
- 2
In BrokenPost, open Plugins and copy your API key.
- 3
In n8n, install the BrokenPost community node (the Plugins page links to it).
- 4
Add your API key as a credential.
- 5
Add a BrokenPost step to any workflow to create posts.
Prefer another way? See every way to connect n8n.
Slack workflows to build in n8n
Each one ends with a step that sends the message to BrokenPost.
- “When a new row is added to a spreadsheet, schedule a Slack message with its text at the time in the row.”
- “When a new blog post shows up in your RSS feed, schedule a Slack message that links to it.”
- “When someone submits a form, save a Slack message as a draft for your team to approve.”
- “When a product is added to your store, post it to Slack the next morning.”
What happens next
- 1
Your n8n workflow starts from its trigger, like a new row, a form or an RSS item.
- 2
It sends the text, the date and the channel to the BrokenPost public API.
- 3
BrokenPost pulls in any media and saves the message on your calendar, as scheduled or as a draft.
- 4
At the set time BrokenPost publishes it to Slack. If Slack rejects it, the message shows as failed with the reason.
Slack limits to build for
Keep each message inside these limits. If Slack rejects one, it shows as failed on your calendar with the reason.
| Characters | 400,000 characters |
|---|---|
| Media | Pictures (PNG, JPG, GIF), no video |
| Video | Not supported |
| Channel | Pick one per post |
| Replies | Yes |
Slack settings you can send
Send them with the post in the Slack settings.
- Channel
If Slack rejects a message
The message shows as failed on your calendar with one of these messages.
| What you see | How to fix it |
|---|---|
| No video support for Slack, only images | Remove the video and attach a PNG, JPG or GIF. |
Good to know
- Slack only takes pictures here, not videos.
- Pick the channel in the Slack settings of the post.
- Send the message as a draft when you want someone to check it in BrokenPost first.
Questions people ask
Can n8n post to Slack?
Yes, through BrokenPost. Connect Slack in BrokenPost, then send posts to the BrokenPost public API from n8n.
What are the Slack limits?
400,000 characters. Pictures (PNG, JPG, GIF), no video. If Slack rejects a post, it shows as failed on your BrokenPost calendar with the reason.
Can n8n schedule Slack messages for later?
Yes. Send a date and time with the post and it goes out then, or send it as a draft to check it first.
Is it free?
The public API works on every plan. The Free plan includes 1 account on every app and 20 posts a month. Paid plans start at $19 a month with unlimited posts.
More apps with n8n
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