Basic Usage

The Slack Web API allows you to build applications that interact with Slack in more complex ways than the integrations we provide out of the box.

This package is a modular wrapper designed to make Slack Web API calls simpler and easier for your app. Provided below are examples of how to interact with commonly used API endpoints, but this is by no means a complete list. Review the full list of available methods here.

See Tokens & Authentication for API token handling best practices.


Sending a message

The primary use of Slack is sending messages. Whether you’re sending a message to a user or to a channel, this method handles both.

To send a message to a channel, use the channel’s ID. For IMs, use the user’s ID.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "chat.postMessage",
  channel="#python",
  text="Hello from Python! :tada:"
)

There are some unique options specific to sending IMs, so be sure to read the channels section of the chat.postMessage page for a full list of formatting and authorship options.


Updating the content of a message

Let’s say you have a bot which posts the status of a request. When that request is updated, you’ll want to update the message to reflect it’s state. Or your user might want to fix a typo or change some wording. This is how you’ll make those changes.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "chat.update",
  ts="1476746830.000003",
  channel="C0XXXXXX",
  text="Hello from Python! :tada:"
)

See chat.update for formatting options and some special considerations when calling this with a bot user.


Deleting a message

Sometimes you need to delete things.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "chat.delete",
  channel="C0XXXXXX",
  ts="1476745373.000002"
)

See chat.delete for more info.


Adding or removing an emoji reaction

You can quickly respond to any message on Slack with an emoji reaction. Reactions can be used for any purpose: voting, checking off to-do items, showing excitement — and just for fun.

This method adds a reaction (emoji) to an item (file, file comment, channel message, group message, or direct message). One of file, file_comment, or the combination of channel and timestamp must be specified.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "reactions.add",
  channel="C0XXXXXXX",
  name="thumbsup",
  timestamp="1234567890.123456"
)

Removing an emoji reaction is basically the same format, but you’ll use reactions.remove instead of reactions.add

sc.api_call(
  "reactions.remove",
  channel="C0XXXXXXX",
  name="thumbsup",
  timestamp="1234567890.123456"
)

See reactions.add and reactions.remove for more info.


Getting a list of channels

At some point, you’ll want to find out what channels are available to your app. This is how you get that list.

Note: This call requires the channels:read scope.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call("channels.list")

Archived channels are included by default. You can exclude them by passing exclude_archived=1 to your request.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "channels.list",
  exclude_archived=1
)

See channels.list for more info.


Getting a channel’s info

Once you have the ID for a specific channel, you can fetch information about that channel.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "channels.info",
  channel="C0XXXXXXX"
)

See channels.info for more info.


Joining a channel

Channels are the social hub of most Slack teams. Here’s how you hop into one:

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "channels.join",
  channel="C0XXXXXXY"
)

If you are already in the channel, the response is slightly different. already_in_channel will be true, and a limited channel object will be returned. Bot users cannot join a channel on their own, they need to be invited by another user.

See channels.join for more info.


Leaving a channel

Maybe you’ve finished up all the business you had in a channel, or maybe you joined one by accident. This is how you leave a channel.

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call(
  "channels.leave",
  channel="C0XXXXXXX"
)

See channels.leave for more info.


Get a list of team members

from slackclient import SlackClient

slack_token = os.environ["SLACK_API_TOKEN"]
sc = SlackClient(slack_token)

sc.api_call("users.list")

See users.list for more info.