Easy Dark Mode for Slack

Hunter Chang on September 04, 2018

UPDATE: As of Slack 4.0, the methods below no longer work. I've had success using this: https://github.com/LanikSJ/slack-dark-mode I recently got ... [Read Full]
markdown guide
 

code one-liner for repeated injection:

echo 'document.addEventListener("DOMContentLoaded", function() {$.ajax({url: "https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css",success: function(css) {let overrides = "code { background-color: #535353; color: #85c5ff; } .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }"; $("<style></style>").appendTo("head").html(css + overrides);}});});' | sudo tee -a /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

just paste in terminal and hit enter
sudo tee -a fix from sven

 

i have modified Fynn’s one liner to allow the script to be executed multiple times without adding the code more than once. If you place this script in an automator application on your mac, you can add it as a startup program so that it runs on boot.

sed -i.bak '/darkmode BEGIN/,/darkmode END/d' /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js && echo -e '//darkmode BEGIN\ndocument.addEventListener("DOMContentLoaded", function() {\n $.ajax({\n   url: "https://cdn.jsdelivr.net/gh/laCour/slack-night-mode/css/raw/black.css",\n   success: function(css) {\n     let overrides = `\n     code, pre { background-color: #535353; color: #ffffff; }\n     .c-mrkdwn__pre, .c-mrkdwn__quote, pre { background: #535353 !important; background-color: #535353 !important; }\n     #client_body:not(.onboarding):not(.feature_global_nav_layout):before {display: none;}\n     `\n     $("<style></style>").appendTo("head").html(css + overrides);\n   }\n })});\n//darkmode END' >> /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

edit: Implemented Wayne's jsdelivr modification, used absolute path to ssb-interop.js in sed command

 
 

For the security conscious among us (or those on corporate networks that would kill us for including external code in a JS File in our slack), here's a version that inlines the contents of that file, and asks you for permission before updating so you can check out the "css" downloaded.

(I put "css" in quotes because there's a risk that the code could be compromised and not be CSS at all. Articles like this hackernoon.com/im-harvesting-credi... make me nervous about these types of attack vectors).

In any case:

echo "TEXT TO BE ADDED:"; echo "document.addEventListener('DOMContentLoaded', function() { const css = \`$(curl --silent https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css)\`; const overrides = 'code { background-color: #535353; color: #85c5ff; } .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353  background-color: #535353 \!important; }'; \$('<style></style>').appendTo('head').html(css + overrides); });"; echo "LOOKS OKAY??? (y = yes)"; read ANSWER; if ! [[ "$ANSWER" =~ ^([yY][eE][sS]|[yY])+$ ]]; then echo "YOU DID NOT ENTER YES. NOT UPDATING"; else; echo "EVERYTHING LOOKS GOOD. UPDATING SLACK."; echo "document.addEventListener('DOMContentLoaded', function() { const css = \`$(curl --silent https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css)\`; const overrides = 'code { background-color: #535353; color: #85c5ff; } .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353  background-color: #535353 \!important; }'; \$('<style></style>').appendTo('head').html(css + overrides); });" | sudo tee -a /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js; fi;
 

Hey fynn, I tried this command and got the following error:

-bash: /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js: Permission denied

Any idea why?

 

well, sounds like you don't have the right permissions to edit that file.
just add sudo at the beginning of the one-liner (on a  ctrl + a gets you there).

Should have said this in my original post, but sudo doesn't seem to help. I have admin permissions on this computer, though it's running Mojave and I'm not sure if that added any complications. I also dragged Terminal into "Full Disk Access" in Security & Privacy preferences just to be sure. Weird.

well, admin permissions and sudo aren't really the same. some files have an extra layer of "protection".

what does ls -la /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js say?

Here's what I get:

-rw-r--r-- 1 root wheel 3806 Oct 22 09:03 /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

(I edited the file manually this morning to get it working)

yeah so the file belongs to the root user.. not you, meaning you have to use sudo or chown

Just use

echo 'document.addEventListener("DOMContentLoaded", function() {$.ajax({url: "https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css",success: function(css) {let overrides = "code { background-color: #535353; color: #85c5ff; } .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }"; $("<style></style>").appendTo("head").html(css + overrides);}});});' | sudo tee -a /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

to fix your permission issues.

 

This post inspired this CLI tool, which make it easy to switch among 8 available themes with simple commands like

slack-theme night

to use dark mode, or

slack-theme day

to revert to light mode.

Right now, my slack automatically changes to dark mode at dusk and returns during the day 😄

 
 

Hey!

How do you automatically change to dark mode at dusk and returns during the day?
With Automator?

Thanks,

Noah

 
 
 

This awesome dark theme stopped working in Slack 4.0.0. The filepath is broken. Path

/Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

no longer works because .../src folder has been entirely deleted. I guess Slack introduced a new place for the ssb-interop.js file or replaced it with new implementation.

Any solutions from anyone?

 
 
 

rawgit.com is shutting down. Probably best to use jsdelivr now:

https://cdn.jsdelivr.net/gh/laCour/slack-night-mode/css/raw/black.css

I don't need any overrides anymore because the issues I was having have been fixed in master.

At the bottom of ssb-interob.js:

document.addEventListener('DOMContentLoaded', function() {
 $.ajax({
   url: 'https://cdn.jsdelivr.net/gh/laCour/slack-night-mode/css/raw/black.css',
   success: function(css) {
     $("<style></style>").appendTo('head').html(css);
   }
 });
}
 

Some of the markup needs to be fixed.
'code' '''preformatted''' and >quote are all black on black backgrounds and you can't see them. I edited the above code to include:

document.addEventListener('DOMContentLoaded', function() {
 $.ajax({
   url: 'https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css',
   success: function(css) {
     let overrides = `
     code { background-color: #535353; color: #85c5ff; } /* Change color: to whatever font color you want */
     .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }
     `
     $("<style></style>").appendTo('head').html(css + overrides);
   }
 });
});

Edited: fixed a typo in the code snippit.
Edited: found a way to also fix backgrounds for '''preformatted''' and >quote

 

Hello,

It looks like 3.3.8 broke the skin in the slack "Thread" part
Can someone advise me on how to fix this.

This skin is ery important to me because we are running shift rotations.

Thank you in advance.

Bart

 

You're the hero our office needed today for this. Where can I send a case of ramen?

 

I apologize if this is a trivial question since I know essentially no JS, but how would you modify the added js above in order to read the .css from a local file. the example works great for me, but it doesn't work if I try various paths for replacing the 'url between the single quotes'

 

This will work for you. Again, put it at the end of the ssb-interop.js file. If you are running on Windows, use the forward slash and start the path with 'C:/' :

document.addEventListener('DOMContentLoaded', function() {
var fs = require('fs'),
filePath = '/Applications/Slack.app/Contents/Resources/black-slack.css';

fs.readFile(filePath, {encoding: 'utf-8'}, function(err, data) {
if (!err) {
var css = document.createElement('style')
css.innerText = data;
document.getElementsByTagName('head')[0].appendChild(css);
}
})
});

 

On Windows, you can use this in Explorer to navigate to the correct file

%localappdata%\slack\

 

Hello
I am using 4.0.0 64-bit version on Windows and the suggested directory does no longer exist. We have now :
\AppData\Local\slack\app-4.0.0\resources\app.asar.unpacked:
+---dist
+---node_modules

 
[deleted]
 

Any chance you know the location for Linux (Debian) machines?

 

Think this might work:

Linux: /usr/lib/slack/
Windows: %homepath%\AppData\Local\slack\

 
 

Hi Hunter, this hack was awesome while it lasted, I wonder if you could update it to the latest version of slack? It doesn't seem to work for version 3.3.7.

 

When you say it does not work, are you seeing the text field on Slack threads in white as well?

 

A quick workaround is to add .p-threads_footer__input .p-message_input_field { background: #000 }; to the CSS file.

In case anyone wants to use - gist.githubusercontent.com/arunsat...

thanks Arun, this fixed the thread sidebar, but still having the issue on the "threads" view (when you click threads in the top left)

 
 

Hi, any idea how to change the links color in messages? Now it is gray and mixes with the message white text and with the black background.
Thanks

 

This works great except in Slack threads.

In a thread the text entry field is white and text is a very light gray.

 

I see the same behaviour now, pretty sure this was not the case in the past. Wonder what changed.

 

A quick workaround is to add .p-threads_footer__input .p-message_input_field { background: #000 }; to the CSS file.

In case anyone wants to use - gist.githubusercontent.com/arunsat...

 
 

I've been looking for a working version of this for a long time. THANK YOU! 🔥

 

Just a reminder: You will have to do this again after each Slack update, so keep this page bookmarked ;-)

 
 
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