`npm install svg-parser`, or grab it from [npmcdn.com/svg-parser](https://npmcdn.com/svg-parser).

import { parse } from 'svg-parser';

const parsed = parse( `
    <svg viewBox='0 0 100 100'>
        <!-- stuff goes here... -->
    </svg>
` );
/*
{
  type: 'root',
  children: [
    {
      type: 'element',
      tagName: 'svg',
      properties: {
        viewBox: '0 0 100 100'
      },
      children: [...]
    }
  ]
}
*/