Normalize strings in order to create pretty url. If you have to generate beautiful urls from strings in which certain characters or html elements may exist, this is your tool.

tool-url-normalize.js

/**
 * Title: Normalize strings in order to create pretty url.
 *
 * Description: If you have to generate beautiful urls from strings
 * in which certain characters or html elements may exist, this is your tool.
 */
 
const urlNormalize = (str) => {
  const from = Array.from('ÃÀÁÄÂÈÉËÊÌÍÏÎÒÓÖÔÙÚÜÛãàáäâèéëêìíïîòóöôùúüûÑñÇç');
  const to = Array.from('AAAAAEEEEIIIIOOOOUUUUaaaaaeeeeiiiioooouuuunncc');
  const mapping = Object.assign(...from.map((letter, index) => ({[letter] : to[index] })));
  const res = Array
    .from(str)
    .reduce((result, letter) => result + (mapping[letter] || letter), '')
    .trim()
    .replace(/[^-A-Za-z0-9]+/g, '-') // Replace white space to -
    .replace(/-+/g,'-') // Remove duplicated dashs
    .replace(/<[^>]*>?/gm, '') // Replace html tags to empty
    .toLowerCase(); // Transform to lower case
  return res;
}