Many response objects from the Slack API include properties repeated across several other responses. Let’s look at some of these properties and the details of the objects they contain.

Note: Depending on the endpoint we call, the response may or may not include several of the fields discussed for each object.

Messages

Many responses include a message property containing the details of a specific message posted to a conversation. Some of the more important properties of the message object are discussed in the table below:

Property	Type	Description
`type`	string	The type of message that was posted.
`subtype`	string	The subtype of the message, indicating whether it was a "me" message, within a thread, etc.
`text`	string	The message text that is displayed within notifications.
`user`	string	The ID of the user that posted the message.
`bot_id`	string	The ID of the bot that posted the message.
`app_id`	string	The ID of the application that posted the message.
`ts`	string	The timestamp of the posted message.
`thread_ts`	string	The timestamp of the posted message if it was posted within a thread.
`edited`	object	An object containing the ID of the user that edited the message and the timestamp of when the message was edited.
`blocks`	array[object]	An array of message blocks.
`attachments`	array[object]	An array of attachments to the message, if any.
`reactions`	array[object]	An array of all reactions added to the message, including the reaction name and the users that added the reaction.

Property	Type	Description
`id`	string	The unique ID of the conversation.
`name`	string	The name of the conversation.
`is_channel`	boolean	Indicates whether the conversation is a public channel.
`is_group`	boolean	Indicates whether the conversation is a private group chat.
`is_mpim`	boolean	Indicates whether the conversation is a multiparty group message.
`is_im`	boolean	Indicates whether the conversation is a private message.
`is_private`	boolean	Indicates whether the conversation is private.
`created`	string	The Unix timestamp of when the conversation was created.
`creator`	string	The ID of the user that created the conversation.
`topic`	object	The details of the conversation topic, including the value of the topic, when it was set, and the user that set the topic.
`purpose`	object	The details of the conversation purpose, including the value of the purpose, when it was set, and the user that set the purpose.
`previous_names`	array[string]	A list of the conversation's previous names.

Property	Type	Description
`id`	string	The unique ID of the file.
`created`	number	The timestamp of when the file was created.
`name`	string	The full name of the file, including the file extension.
`title`	string	The title of the file.
`filetype`	string	The file type.
`user`	string	The ID of the user who created the file.
`size`	number	The file size in bytes.
`is_external`	boolean	Indicates whether the file is an external/remote file.
`is_public`	boolean	Indicates whether the file is shared publicly.
`preview`	string	The preview that is shown when the file is shared within a conversation.

Property	Type	Description
`id`	string	The unique ID of the user.
`name`	string	The user's full name.
`deleted`	boolean	Indicates whether the user has been deleted.
`tz`	string	The user's timezone.
`profile`	object	The user's profile, including social media links, contact information, name details, and status.
`is_admin`	boolean	Indicates whether the user has administrator permissions.
`is_owner`	boolean	Indicates whether the user is the owner of the workspace.
`is_bot`	boolean	Indicates whether the user is a bot.

Introduction

Chat Using the Application

Conversations Using an App

File Management

Users

Manage Reactions

Slack's Bolt Framework

Conclusion

Appendix

Details of Response Fields

Messages

Channels

Files

Users