1. Import Squircley.js as an ES module.

import { 
  // core
  createSquircle, 
  // squircle background image
  squircleBackground 
} from './src/squircley.js';

2. Create an SVG primarily based squircle and customize the form with the next options:

const squircleSVG = createSquircle({
      format: 'SVGNode',
      curvature: 0.5,
      fill: '#4C3EF7',
      rotate: 0
});

3. Generate a base64 encoded squircle and append it to a picture.

const target = document.querySelector('img');
const squircleBase64 = createSquircle({
      format: 'base64',
      // options here
});
target.src = squircleBase64;

4. Generate a URL-encoded background picture.

const squircleBackgroundImage = createSquircle({
      format: "backgroundImage",
      // options here
});
// apply the background image to an element
document.documentElement.style.setProperty(
  "--svg-squircle",
  squircleBackgroundImage
);
// or
document.body.style.backgroundImage = squircleBackgroundImage;

5. Or instantly use the squircleBackground module.

squircleBackground('.squircle-background', {
  // options here
});

Customizable Squircle Generator In JavaScript, Squircley JS Plugin/Github

See Demo And Download