Slack bot send an image

Question

I am developing a bot for slack. I am implementing a notification functionality, where it will send a notification for every one hour. Currently, I am sending normal text in notification, but I need to send an image along with text. Is it possible to send an image?

Answer 1

You can send images as part of the attachments of a message. That can be either a full image or a thumbnail.

Just add the image_url property for full images or the thumb_url property for a thumbnail image with a url to an image to your attachment and it will be displayed under your message. You can also send multiple images through adding multiple attachments.

Example attachment: (based on official Slack documentation example)

{
    "attachments": [
        {
            "fallback": "Required plain-text summary of the attachment.",
            "text": "Optional text that appears within the attachment",
            "image_url": "http://my-website.com/path/to/image.jpg",
            "thumb_url": "http://example.com/path/to/thumb.png"
        }
    ]
}

This works with all approaches for sending message, e.g. API method, Incoming webhook, response to slash commands etc.

See here for the official Slack documentation for attachments.