Post messages to a workspace

Sends a message to a channel.

Sends an ephemeral message to a user in a channel.

Message metadata was posted

Authorizing with Postman.

For the few of you out there using outdated tokens, we've made some changes to authorship behavior when using chat.postMessage.

Create one-way webhooks to post messages to a specific channel

Post messages in approved channels & conversations

Retrieve a thread of messages posted to a conversation

Upgrade or downgrade Slack Connect channel permissions between 'can post only' and 'can post and invite'.

Provide custom unfurl behavior for user-posted URLs

Set the posting permissions for a public or private channel.

A message was posted in a multiparty direct message channel

A message was posted in a direct message channel

A message was posted to a private channel

A message was posted to a channel

A message was posted containing one or more links relevant to your application

This autumn or soon thereafter, users will begin editing messages using a WYSIWYG (what you see is what you get) interface. When they do, their posted messages will appear slightly different throughout our APIs. Learn more.

We're still tidying up the character limits on the text field of posted messages and gradually lowering its maximum. On April 25th, 2018, we began truncating messages greater than 500,000 characters. As of July 12 2018, the maximum is 100,000. We'll begin truncating messages greater than 40,000 characters in August. Learn more.

Workspace token apps in developer preview now must request the chat:write scope to post messages. Existing access grants are backfilled. Read on, developer previewers!