a greasemonkey script to remove bad UTM tags from link HREFs

remove-badUTM.user.js

const removeBadTags = (badTags) => {
  const links = [...document.querySelectorAll('a')]

  links.forEach(
    (l) => {
      badTags.forEach(
        (b) => {
          const badFirstRegex = RegExp(`[\?]${b}=[^\?&#]*`, 'gi')
          const badSecondRegex = RegExp(`[&]${b}=[^\?&#]*`, 'gi')
          if (l.href.match(badFirstRegex)) {
            const hrefNoBad = l.href
              .replace(badFirstRegex, '?')
              .replace(/\?[\?&]/, '?')
              .replace(/[\?&]\#/, '#')
              .replace(/[\?&]$/, '')
            l.href = hrefNoBad
          }
          if (l.href.match(badSecondRegex)) {
            const hrefNoBad = l.href
              .replace(badSecondRegex, '&')
              .replace(/\&[\&]/, '&')
              .replace(/[\?&]\#/, '#')
              .replace(/[\?&]$/, '')
            l.href = hrefNoBad
          }
        }
      )
    }
  )
}


const badTags = [
  // put your bad UTM tags here
  'badUTM',
]

removeBadTags(badTags)