How to Generate Styles from Objects in JavaScript

How to Generate Styles from Objects in JavaScript

Ferenc Almasi β€’ 2020 October 13 β€’ πŸ“– 1 min read

To generate inline CSS styles from JavaScript objects, use the following function:

const book = {
  content: 'πŸ“’',
  display: 'block',
  padding: '20px',
  background: 'yellow'

const getStyles = obj => Object.keys(obj).map(key => `${key}:${obj[key]}`).join(';');

// Later you can call the function to inline the styles
Copied to clipboard!

This works by:

  • First looping through the keys of the object with Object.keys
  • For each key, it returns with a new string (the key and value combined), by calling map
  • Lastly, it joins everything together with a semicolon, using join

If you have multiple styles to take care of, you can also use the below assignment to generate them in one go:

const styles = {
    heroCTA: {
        display: 'block'
    heroImage: {
        display: 'block',
        width: '100%'

const generatedStyles = Object.fromEntries(Object.entries(styles).map(([element, style]) => [element, getStyles(style)]));

// This will generate the following object:
    heroCTA: 'display:block',
    heroImage: 'display:block;width:100%'
Copied to clipboard!
Generate Styles from Objects in JavaScript
If you would like to see more Webtips, follow @flowforfrank

50 JavaScript Interview Questions
Looking to improve your skills? Check out our interactive course to master JavaScript from start to finish.
Master JavaScript


Did you find this page helpful?
πŸ“š More Webtips
Frontend Course Dashboard
Master the Art of Frontend
  • check Unlimited access to hundred of tutorials
  • check Access to exclusive interactive lessons
  • check Remove ads to learn without distractions
Become a Pro