Supply CSS styling to console.log. Note use of %c.

Single style

console.log('%cMy red text', 'color: red')

Combine styles

console.log('%cMy bold and red text', 'font-weight: bold; color: red')

Split styles

console.log('%cMy bold text %cMy red text', 'font-weight: bold', 'color: red')

This only seems to work in the browser and not in Node. You’ll need come control characters or an NPM package to handle colors in Node.