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Slack Message

This document provides examples and guidelines for building Slack messages using Block Kit Builder and sending messages via Incoming Webhooks and Slack API.

Slack Block Kit Builder

You can use the Slack Block Kit Builder app to visually design and test your Slack message layouts:
https://app.slack.com/block-kit-builder

Try changing properties like color in attachments or customizing blocks for your needs.

Incoming Webhooks

Slack Incoming Webhooks allow you to send messages to Slack channels via HTTP requests.
You need to create an app and enable Incoming Webhooks in your Slack workspace:
https://api.slack.com/apps

Example Incoming Webhook URL:
https://hooks.slack.com/services/XXXXXXXXX/XXXXXXXXX/XXXXXXXXXXXXXXXXXXXX

Example Slack Messages Using Block Kit JSON

Reminder Message (Start of Event)

{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": "🌟 Friendly Reminder: Upcoming Team Meeting :rocket:",
        "emoji": true
      }
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "Hi Team,\n\nJust a quick reminder about our upcoming *Team Meeting*:\n\n*📌 Topic:* Efficient Build System Updates\n*🗓️ Date:* 22.11.2024\n*⏰ Time:* 15:00-16:00\n*📍 Link:* <https://meeting-link.example.com|Click here to join the meeting>\n\nLooking forward to seeing you all there! 😊"
      }
    }
  ]
}

Thank You Message (End of Event)

{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": "👏 Great Job, Team! 🎉",
        "emoji": true
      }
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "Thank you everyone for your participation in today’s Team Meeting :rocket:! Special thanks to our presenters for their excellent work:\n\n*🗣️ Presenter 1* - for the *Build System Overview* presentation 👏\n*🗣️ Presenter 2* - for the *Automation Tools* presentation 👏\n\nPlease share your topic ideas in the #team-announcements channel. Looking forward to the next meeting! 🚀"
      }
    },
    {
      "type": "divider"
    },
    {
      "type": "context",
      "elements": [
        {
          "type": "plain_text",
          "text": "Thanks again, everyone! Keep up the fantastic work! 💪🏼",
          "emoji": true
        }
      ]
    }
  ]
}

Example with User Mentions

In Slack Block Kit, you can mention users by their Slack User ID:

{
  "type": "section",
  "text": {
    "type": "mrkdwn",
    "text": "Special shoutout to our presenter <@U12345678> for an amazing presentation! 🎉"
  }
}

Replace U12345678 with the actual Slack User ID.

Example: User Joining Request Message

{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": "User Request to Join Channel",
        "emoji": true
      }
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "Hello @here, <@U12345678> would like to join this private channel but cannot. Could someone please add them?"
      }
    }
  ]
}

Sending Messages Using curl and Incoming Webhooks

Replace YOUR_WEBHOOK_URL with your actual webhook URL.

Send Reminder Message

curl -X POST -H 'Content-type: application/json' --data '{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": "🌟 Friendly Reminder: Upcoming Team Meeting :rocket:",
        "emoji": true
      }
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "Hi Team,\n\nJust a quick reminder about our upcoming *Team Meeting*:\n\n*📌 Topic:* Efficient Build System Updates\n*🗓️ Date:* 22.11.2024\n*⏰ Time:* 15:00-16:00\n*📍 Link:* <https://meeting-link.example.com|Join here>\n\nLooking forward to seeing you all there! 😊"
      }
    }
  ]
}' https://hooks.slack.com/services/YOUR_WEBHOOK_URL

Send Thank You Message

curl -X POST -H 'Content-type: application/json' --data '{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": "👏 Great Job, Team! 🎉",
        "emoji": true
      }
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "Thank you everyone for your participation in today’s Team Meeting :rocket:! Special thanks to our presenters for their excellent work:\n\n*🗣️ Presenter 1* - for the *Build System Overview* presentation 👏\n*🗣️ Presenter 2* - for the *Automation Tools* presentation 👏\n\nPlease share your topic ideas in the #team-announcements channel. Looking forward to the next meeting! 🚀"
      }
    },
    {
      "type": "divider"
    },
    {
      "type": "context",
      "elements": [
        {
          "type": "plain_text",
          "text": "Thanks again, everyone! Keep up the fantastic work! 💪🏼",
          "emoji": true
        }
      ]
    }
  ]
}' https://hooks.slack.com/services/YOUR_WEBHOOK_URL

Emoji Customization

You can use custom emojis in your messages. Manage your workspace emojis here: https://YOURWORKSPACE.slack.com/customize/emoji

Use emojis by their shortcodes, for example: :rocket:, :star:, :heart:.