Slack Bot Poster

"Automated Slack Messaging & Alerts" by John Rippy | johnrippy.link

🏆 2025 Zapier Automation Hero of the Year — Project Phoenix: A 95-step AI sales pipeline cutting development time by 50%. Read more →

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Send automated messages to Slack workspaces using your bot token. Perfect for notifications, alerts, scheduled updates, and team automation.

Features

Simple Messages: Send plain text messages with Slack markdown support
Rich Blocks: Create beautiful layouts with Slack Block Kit
Attachments: Use legacy attachments for colored sidebars
Multi-Channel: Post to multiple channels in a single run
Thread Replies: Reply to existing message threads
Custom Branding: Override bot name and icon per message
Validation Mode: Test channel access before posting

Setup

1. Create a Slack App

1. Go to Slack API Apps

2. Click "Create New App" > "From scratch"

3. Name your app and select your workspace

4. Go to "OAuth & Permissions"

5. Add Bot Token Scopes: chat:write, chat:write.public

6. Click "Install to Workspace"

7. Copy the Bot User OAuth Token (starts with xoxb-)

2. Get Channel ID

1. Right-click the channel in Slack

2. Click "Copy Link"

3. The channel ID is the last part of the URL (e.g., C1234567890)

Usage Examples

Simple Message

{
"botToken": "xoxb-your-token",
"channelId": "C1234567890",
"message": "Hello from Apify! :wave:"
}

Rich Block Kit Message

{
"botToken": "xoxb-your-token",
"channelId": "C1234567890",
"blocks": "[{\"type\":\"section\",\"text\":{\"type\":\"mrkdwn\",\"text\":\"New Lead Alert :bell:\\nJohn Smith just signed up!\"}},{\"type\":\"divider\"},{\"type\":\"section\",\"fields\":[{\"type\":\"mrkdwn\",\"text\":\"Email:\\njohn@example.com\"},{\"type\":\"mrkdwn\",\"text\":\"Source:\\nGoogle Ads\"}]}]"
}

Multi-Channel Broadcast

{
"botToken": "xoxb-your-token",
"channelIds": ["C1234567890", "C0987654321", "C5555555555"],
"message": ":mega: Important announcement for all teams!"
}

Thread Reply

{
"botToken": "xoxb-your-token",
"channelId": "C1234567890",
"threadTs": "1234567890.123456",
"message": "Adding more details to this thread...",
"replyBroadcast": true
}

Custom Bot Appearance

{
"botToken": "xoxb-your-token",
"channelId": "C1234567890",
"message": "Daily sales report ready!",
"username": "Sales Bot",
"iconEmoji": ":chart_with_upwards_trend:"
}

Output

Each successful post returns:

{
"channelId": "C1234567890",
"channelName": "general",
"messageTs": "1234567890.123456",
"content": "Hello from Apify!",
"status": "sent",
"sentAt": "2024-01-15T10:30:00.000Z",
"permalink": "https://workspace.slack.com/archives/C1234567890/p1234567890123456"
}

Pricing

Message Sent: $0.005 per message
Channel Validated: $0.002 per validation

Block Kit Resources

Block Kit Builder - Visual builder
Block Kit Reference - Documentation
Message Formatting - Markdown guide

Tips

Use Block Kit Builder to design messages visually, then copy the JSON
Test with validateOnly: true before sending to production channels
For DMs, use user IDs (starting with U) as channel IDs
Schedule runs with Apify's scheduler for recurring messages
Combine with webhooks for event-driven notifications

Support

For issues or feature requests, visit johnrippy.link

🏆 2025 Zapier Automation Hero of the Year — Project Phoenix: A 95-step AI sales pipeline cutting development time by 50%. Read more →

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Built by John Rippy | johnrippy.link

🏆 2025 Zapier Automation Hero of the Year — Project Phoenix: A 95-step AI sales pipeline cutting development time by 50%. Read more →