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# Colorful Console Message 🌈

Add some attitude to your console statement with the %c specifier 👩‍🎨 This is super handy to help you easily identify debug information from the console 👾

Especially if you have a huge application where there are tons of logs being printed out in the browser console. Styling your log message will make sure those important messages don't get buried 👍

Or use it like Facebook to tell people to stay away. Next time you visit their site, open up the Developer Tools, you will see a large "Stop!" message in the console. Well, now you know how that's being created 💥

// Put this in your browser console
console.log('%cHello', 'color: green; background: yellow; font-size: 30px');

# What is %c

%c: Applies CSS style rules to the output string as specified by the second parameter

# Multiple Console Message Styles

To add multiple style, you just pre-pend the message with %c. The text before the directive will not be affected. Only the text after the directive will be styled using the CSS declarations in the parameter.

  'Nothing here %cHi Cat %cHey Bear', // Console Message
  'color: blue',
  'color: red' // CSS Style

# Applying style to other console messages

There are 5 console types of console messages:

  • console.log
  • console.info
  • console.debug
  • console.warn
  • console.error

Any yup, you can style the rest of them as well!

console.log('%cconsole.log', 'color: green;');
console.info('%cconsole.info', 'color: green;');
console.debug('%cconsole.debug', 'color: green;');
console.warn('%cconsole.warn', 'color: green;');
console.error('%cconsole.error', 'color: green;');

# Passing the console CSS style as an Array

As you get more styles, the string can be quite long. Here's a nifty trick you can do to clean things up. You can pass the styles as an array. And then you can use the join() method to turn the array style elements into a string.

// 1. Pass the css styles in an array
const styles = [
  'color: green',
  'background: yellow',
  'font-size: 30px',
  'border: 1px solid red',
  'text-shadow: 2px 2px black',
  'padding: 10px'
].join(';'); // 2. Concatenate the individual array item and concatenate them into a string separated by a semi-colon (;)

// 3. Pass the styles variable
console.log('%cHello There', styles);

To learn more about join(), you can read my Web Basics series or check out the official MDN docs.

# Refactoring console message with %s

Beside cleaning up the console message by passing the styles as an array. We can also clean up the message using the %s specifier.

const styles = ['color: green', 'background: yellow'].join(';');

const message = 'Some Important Message Here';

// 3. Using the styles and message variable
console.log('%c%s', styles, message);

# Community Suggestions

# Console Font Color in node.js

If you're running node.js application, you can use the color reference of text to style your messages.

Stack Overflow: Color Reference

console.log('\x1b[36m%s\x1b[0m', 'I am cyan'); // Cyan
console.log('\x1b[33m%s\x1b[0m', 'yellow'); // Yellow

Thanks @danieldeepak7

# Community Feedback

@thecodegoddess: I love this especially for projects that have a ton of logging from third party apps. My logs will get buried. I even added a snippet to my IDE so I can easily stick this in. My go to CSS debugging color? Deeppink.

# Resources

Related Tidbits