Code from the Query String Parameters video on DevTips

hacky.js

const URL = 'https://www.adlibris.com' +
  '/se/bok/factfulness-tio-knep-som-hjalper-dig-forsta-varlden-9789127149946' +
  '?filter=hardcover' +
  '&gclid=760a19f0-5057-417a-8e6a-b44a01b12a46' + 
  '&some=thing'

const [first, last] = URL.split("?")
const URLwithoutGCLID = first
URLwithoutGCLID

javascript.js

const URL = 'https://www.adlibris.com' +
  '/se/bok/factfulness-tio-knep-som-hjalper-dig-forsta-varlden-9789127149946' +
  '?hej=monika' +
  '&filter=hardcover' +
  '&some=thing' +
  '&gclid=760a19f0-5057-417a-8e6a-b44a01b12a46'

const a = window.document.createElement('a')
a.href = URL
let params = new URLSearchParams(a.search)
params.delete('gclid')
const first = URL.split("?")[0]
const newParams = params.toString()
const URLwithoutGCLID = `${first}?${newParams}`
URLwithoutGCLID

regex.js

const URL = 'https://www.adlibris.com' +
  '/se/bok/factfulness-tio-knep-som-hjalper-dig-forsta-varlden-9789127149946' +
  '?gclid=760a19f0-5057-417a-8e6a-b44a01b12a46' +
  '&filter=hardcover' +
  '&some=thing'
/*
  Using Kip's answer at:
  https://stackoverflow.com/questions/1842681/regular-expression-to-remove-one-parameter-from-query-string
*/
const reFilterGCLID = /&gclid(\=[^&]*)?(?=&|$)|^gclid(\=[^&]*)?(&|$)/
const [first, last] = URL.split("?")
const paramsWithoutGCLID = last.replace(reFilterGCLID, '')
const URLwithoutGCLID = `${first}?${paramsWithoutGCLID}`
URLwithoutGCLID