Create a message thread

When a user replies to a message in a channel, it creates a message thread, which refers to a collection of messages consisting of a parent message and its replies. Message threading lets users ask questions, give feedback, or add context to a specific message without disrupting the conversation. It can have the following elements.

• A message can have a thread of replies.

• A message that has a thread of replies is a parent message.

• A parent message and its threaded replies are collectively called a message thread.

• Every message within a thread, whether it's parent or reply, is a threaded message.

• A message that doesn't have any replies is an unthreaded message.

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Message threading has the following limitations.

• Only 1-depth threads are supported, meaning you can only add reply messages to non-reply messages. You can't add a reply to a reply message.
• Message threading is limited to text and file messages. You can't send admin messages as replies or add replies to admin messages.

You can reply to a specific message in a channel through the sendUserMessage() or sendFileMessage() method. To do so, you should create a UserMessageCreateParams or a FileMessageCreateParams object and then specify the parentMessageId property of the object. Sending reply messages works the same way as sending regular messages to a channel except that replies have an additional parentMessageId property.

Note: To retrieve information about parent messages and threaded replies, see how to list changelogs of messages in a channel.

When replying to a message through the sendUserMessage() method, specify and pass a UserMessageCreateParams object as an argument to a parameter in the method.

// Create a UserMessageCreateParams object.
const params: UserMessageCreateParams = {
    parentMessageId: PARENT_MESSAGE_ID, // This specifies the unique ID of a parent message which has a thread of replies. If the message sent through the sendUserMessage() method is a parent message, the value of this property is 0.
};

When replying with a file message through the sendFileMessage() method, specify and pass a FileMessageCreateParams object as an argument to a parameter in the method.

// Create a FileMessageCreateParams object.
const params: FileMessageCreateParams = {
    file: FILE,
    parentMessageId: PARENT_MESSAGE_ID, // This specifies the unique ID of a parent message which has a thread of replies. If the message sent through the sendUserMessage() method is a parent message, the value of this property is 0.
};