I want to retrieve all the messages that were sent in my teams slack domain. Although, I'd prefer that the data be received in XML or JSON I am able to handle the data in just about any form.
How can I retrieve all these messages? Is it possible? If not, can I retrieve all the messages for a specific channel?
To access your most recent conversations in Slack, select the History button that resembles a clock. The icon can be found in the top toolbar, left of the search bar. This History button will open a menu listing your most recent conversations in order.
By default, Slack will retain all messages and files (including audio and video clips) for the lifetime of your workspace.
Export data from all channels and conversations Click Security in the left sidebar, then select Exports. Next to the export type you'd like to use, click Export. Choose if you'd like to export data from your entire org or a specific workspace, and select a date range.
In order to retrieve all the messages from a particular channel in slack this can be done by using conversations.history method in slack_sdk library in python.
You can sort messages alphabetically, by newest activity, or by oldest activity. On paid plans, you can sort messages scientifically — a view tailored to how you use Slack. Click Mark as Read to clear a channel's messages when you've read them. You can also scroll to the bottom of the All unreads view and click Mark All Messages Read.
Add a reaction to a message, start or reply a thread, or use message shortcuts. Jump from the All unreads view to a channel or direct message (DM) to send a new message. From your desktop, click All unreads at the top of your left sidebar. If you don’t see this option, click More to find it.
Decide how to prioritize your unread messages by changing how they’re sorted. You can sort messages alphabetically, by newest activity, or by oldest activity. On paid plans, you can sort messages scientifically — a view tailored to how you use Slack. Click Mark as Read to clear a channel's messages when you've read them.
If you need to do this dynamically via API you can use the channels.list method to list all of the channels in your team and channels.history method to retrieve the history of each channel. Note that this will not include DMs or private groups.
If you need to do this as a one time thing, go to https://my.slack.com/services/export to export your team's message archives as series of JSON files
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