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Post a chat message

URL Requires Auth HTTP Method
/api/v1/chat.postMessage yes POST


Argument Example Required Description



The room id of where the message is to be sent.

The channel name with the prefix in front of it.
text Sample message Optional The text of the message to send, is optional because of attachments.
alias Some Name Optional This will cause the message’s name to appear as the given alias, but your username will still display.
emoji :smirk: Optional If provided, this will make the avatar on this message be an emoji. Emoji Cheetsheet
avatar http://site.com/logo.png Optional If provided, this will make the avatar use the provided image url.
attachments [{}] Optional See the below section, Attachments Detail, for details.

Attachments Detail

The attachments is an array of objects with any of the following properties. One attachment can have many sections, including:

  • General
  • Author Information
  • Title Information
  • Image
  • Audio
  • Video
  • Table/Fields
Property Example Section Description
color #ff0000 General The color you want the order on the left side to be, any value background-css supports.
text Sample attachment text General The text to display for this attachment, it is different than the message’s text.
ts 2016-12-09T16:53:06.761Z General Displays the time next to the text portion.
thumb_url https://site.com/img.png General An image that displays to the left of the text, looks better when this is relatively small.
message_link https://rocket.chat General Only applicable if the ts is provided, as it makes the time clickable to this link.
collapsed false General Causes the image, audio, and video sections to be hidding when collapsed is true.
author_name Bradley Hilton Author Name of the author.
author_link https://bit.ly/ Author Providing this makes the author name clickable and points to this link.
author_icon https://site.com/img.png Author Displays a tiny icon to the left of the Author’s name.
title Attachment Title Title Title to display for this attachment, displays under the author.
title_link https://youtube.com Title Providing this makes the title clickable, pointing to this link.
title_link_download https://site.com/img.png Title When this is provided, a download icon appears and clicking this saves the link to file.
image_url https://site.com/img.png Image The image to display, will be “big” and easy to see.
audio_url https://site.com/aud.mp3 Audio Audio file to play, only supports what html audio does.
video_url https://site.com/vid.mp4 Video Video file to play, only supports what html video does.
fields [{}] Fields An array of Attachment Field Objects.

Attachment Field Objects

The field property of the attachments allows for “tables” or “columns” to be displayed on messages.

Property Example Required Description
short true Optional
Default: false
Whether this field should be a short field.
title Status Required The title of this field.
value online Required The value of this field, displayed underneath the title value.

Message Object Example

    "roomId": "Xnb2kLD2Pnhdwe3RH",
    "channel": "#general",
    "text": "Sample message",
    "alias": "Gruggy",
    "emoji": ":smirk:",
    "avatar": "http://res.guggy.com/logo_128.png",
    "attachments": [{
        "color": "#ff0000",
        "text": "Yay for gruggy!",
        "ts": "2016-12-09T16:53:06.761Z",
        "thumb_url": "http://res.guggy.com/logo_128.png",
        "message_link": "https://google.com",
        "collapsed": false,
        "author_name": "Bradley Hilton",
        "author_link": "https://rocket.chat/",
        "author_icon": "https://avatars.githubusercontent.com/u/850391?v=3",
        "title": "Attachment Example",
        "title_link": "https://youtube.com",
        "title_link_download": "https://rocket.chat/download",
        "image_url": "http://res.guggy.com/logo_128.png",
        "audio_url": "http://www.w3schools.com/tags/horse.mp3",
        "video_url": "http://www.w3schools.com/tags/movie.mp4",
        "fields": [{
            "short": true,
            "title": "Test",
            "value": "Testing out something or other"
            "short": true,
            "title": "Another Test",
            "value": "[Link](https://google.com/) something and this and that."

Example Call

curl -H "X-Auth-Token: 9HqLlyZOugoStsXCUfD_0YdwnNnunAJF8V47U3QHXSq" \
     -H "X-User-Id: aobEdbYhXfu5hkeqG" \
     -H "Content-type:application/json" \
     http://localhost:3000/api/v1/chat.postMessage \
     -d '{ "channel": "#general", "text": "This is a test!" }'

Example Result

  "ts": 1481748965123,
  "channel": "general",
  "message": {
    "alias": "",
    "msg": "This is a test!",
    "parseUrls": true,
    "groupable": false,
    "ts": "2016-12-14T20:56:05.117Z",
    "u": {
      "_id": "y65tAmHs93aDChMWu",
      "username": "graywolf336"
    "rid": "GENERAL",
    "_updatedAt": "2016-12-14T20:56:05.119Z",
    "_id": "jC9chsFddTvsbFQG7"
  "success": true

Change Log

Version Description
0.49.0 The channel can now be a room’s id.
0.48.0 Information about the sent message is now returned.
0.17.0 Messages aren’t always processed as from BOT and urls are parsed by default.
0.14.0 Internally using processWebhookMessage which enabled more features.
0.13.0 Added