toSlug.js

// convert qa string to slug in JS
const toSlug = function (str) {
  str = str.replace(/^\s+|\s+$/g, ""); // trim
  str = str.toLowerCase();

  // remove accents, swap ñ for n, etc
  const from = "âăãàáäâẽèéëêìíïîõòóöôùúüûñçșț·/_,:;";
  const to   = "aaaaaaaeeeeeiiiiooooouuuuncst------";
  for (let i = 0, l = from.length; i < l; i++) {
    str = str.replace(new RegExp(from.charAt(i), "g"), to.charAt(i));
  }

  str = str
    .replace(/[^a-z0-9 -]/g, "") // remove invalid chars
    .replace(/\s+/g, "-") // collapse whitespace and replace by -
    .replace(/-+/g, "-"); // collapse dashes

  return str;
};