how to make a image circular in javascript code example

Example 1: convert image in rounshape in css

img {
  border-radius: 50%;
}

Example 2: rounded immage

border-radius: 15px 50px 30px 5px; (first value applies to top-left corner, second value applies to top-right corner, third value applies to bottom-right corner, and fourth value applies to bottom-left corner)