Slugify makes a string URI-friendly

slugify.js

function slugify(string) {
  const a = 'àáäâãåăæçèéëêǵḧìíïîḿńǹñòóöőôœøṕŕßśșțùúüûǘűẃẍÿź·/_,:;'
  const b = 'aaaaaaaaceeeeghiiiimnnnoooooooprssstuuuuuuwxyz------'
  const p = new RegExp(a.split('').join('|'), 'g')

  return string.toString().toLowerCase()
    .replace(/\s+/g, '-') // Replace spaces with -
    .replace(p, c => b.charAt(a.indexOf(c))) // Replace special characters
    .replace(/&/g, '-and-') // Replace & with 'and'
    .replace(/[^\w\-]+/g, '') // Remove all non-word characters
    .replace(/\-\-+/g, '-') // Replace multiple - with single -
    .replace(/^-+/, '') // Trim - from start of text
    .replace(/-+$/, '') // Trim - from end of text
}