Slack: is there a way to disable all @channel notifications

Question

The Slack chat tool by default sends email notifications saying "You were mentioned ..." when in fact it was @channel and not you. The only way I can find to turn these off is to go into each channel setting.

Answer 1

I was looking for the same and I saw that nobody answered, so this is what I've found: you cannot and you won't ever be able to.

@channel: everybody in a channel, it's a kind of contract with the user and everybody inside a channel should receive a notification.

The point is that Slack has a netiquette, and users would have to know it. Alternatives to @channel keyword are @everyone and @here, the first one working only in "big" channels, the second one only for people currently active. You can disable notifications for these keywords.

https://get.slack.help/hc/en-us/articles/202009646-Make-an-announcement

Answer 2

I've had this same problem for a while and manually tweaking prefs is too time-consuming. I've written a script to automate it for me.

For a more in-depth explanation, please visit my blog post:
https://mobeigi.com/blog/programming/disable-slack-channel-and-here-notification-for-all-channels/

Otherwise, the full solution ahead.

Prerequisites

First download this script:
https://gist.github.com/mobeigi/8e5372f1e14e2a302e186d1753f9a649

Or copy and paste it from here:

// Slack User Notification Preference Bulk Update // By Mo Beigi  const slackTeamId = "EXAMPLE17"; const localConfigJson = JSON.parse(localStorage.localConfig_v2); const slackUrl = localConfigJson.teams[slackTeamId].url; let channel_ids = [];  // client.boot contains list of channel ids user is subscribed to amongst other things await fetch(slackUrl + "api/client.boot?" +     "_x_id=noversion-1598950616.732" +     "&_x_version_ts=noversion" +      "&_x_gantry=true",    {     method: 'post',     credentials: 'include',     headers: { "Content-type": "application/x-www-form-urlencoded; charset=UTF-8" },     body: "token=" + localConfigJson.teams[slackTeamId].token +          "&only_self_subteams=1" +          "&flannel_api_ver=4" +          "&include_min_version_bump_check=1" +          "&version_ts=1598934919" +          "&_x_reason=deferred-data" +          "&_x_sonic=true",   }, ) .then(result => result.json()) .then(result => channel_ids = result.channels);  // iterate channel id list and set notification prefs asynchronously let fetchPromises = []; for (i = 0; i < channel_ids.length; ++i) {     console.log("Setting user notification prefs for channel id: " + channel_ids[i].id + " ...");     fetchPromises.push(         fetch(slackUrl + "api/users.prefs.setNotifications?" +             "_x_id=c189c956-1598949859.880" +              "&_x_csid=7dP2GCgBJsY" +              "&slack_route=" + localConfigJson.teams[slackTeamId].enterprise_id + ":" + slackTeamId +             "&_x_version_ts=1598934919" +              "&_x_gantry=true",              {                 method: 'post',                 credentials: 'include',                 headers: { "Content-type": "application/x-www-form-urlencoded; charset=UTF-8" },                 body: "name=suppress_at_channel" +                     "&value=true" +                      "&channel_id=" + channel_ids[i].id +                     "&global=false" +                      "&sync=false" +                     "&token=" + localConfigJson.teams[slackTeamId].token +                     "&_x_reason=prefs-store/setChannelNotificationOverride" +                     "&_x_mode=online" +                     "&_x_sonic=true"             }         )         .then(result => result.json())         .then(console.log("Done (" + channel_ids[i].id + ")"))     );      // Generous delay to get around rate limit     await new Promise(r => setTimeout(r, 250)); }  Promise.all(fetchPromises).then(function() {     console.log("Successfully set user notification prefs for " + channel_ids.length + " channels."); }); 

Steps

1. Visit the React web app which powers the React native Slack client at: http://app.slack.com/client
2. Sign in and switch to the workspace of interest and wait for the page to fully load.
3. Open your browsers developer console
4. Execute the following line: JSON.parse(localStorage.localConfig_v2).teams
5. Replace the slackTeamId in the Javascript script with your id from Step 4.
6. Copy and paste the edited Javascript script into the developer console and execute it. The script may take a few minutes to run depending on the number of channels you have joined.

And that's it!

You should now have turned every channels @channel and @here notification preference off.