Slugify makes a string URI-friendly

slugify.js

function slugify(string) {
  const a = 'àáâäæãåāăąçćčđďèéêëēėęěğǵḧîïíīįìıİłḿñńǹňôöòóœøōõőṕŕřßśšşșťțûüùúūǘůűųẃẍÿýžźż·/_,:;'
  const b = 'aaaaaaaaaacccddeeeeeeeegghiiiiiiiilmnnnnoooooooooprrsssssttuuuuuuuuuwxyyzzz------'
  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
}

arabic

function slugify(string) {
const a = 'àáâäæãåāăąçćčđďèéêëēėęěğǵḧîïíīįìłḿñńǹňôöòóœøōõőṕŕřßśšşșťțûüùúūǘůűųẃẍÿýžźż·/_,:;'
const b = 'aaaaaaaaaacccddeeeeeeeegghiiiiiilmnnnnoooooooooprrsssssttuuuuuuuuuwxyyzzz------'
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(/[^[a-zA-Z0-9أ-ي]-]+/g, "") // Arabic support
.replace(/--+/g, '-') // Replace multiple - with single -
.replace(/^-+/, '') // Trim - from start of text
.replace(/-+$/, '') // Trim - from end of text
}

You don't need to escape those pesky dashes: https://gist.github.com/meowsus/e75867610b7d851baacf37567ce7c409/revisions

@hagemann could you please add an explicit license to this gist? :)

Wow! This is amazing. Thank you so much @hagemann!

Thank you so much!

It can support Turkish "İ" and "ı" characters with the lines below,

const a = 'àáâäæãåāăąçćčđďèéêëēėęěğǵḧîïíīįìıİłḿñńǹňôöòóœøōõőṕŕřßśšşșťțûüùúūǘůűųẃẍÿýžźż·/_,:;'
const b = 'aaaaaaaaaacccddeeeeeeeegghiiiiiiiilmnnnnoooooooooprrsssssttuuuuuuuuuwxyyzzz------'

@melih I’ve added the 2 characters. Thanks for contributing.

Thank you so much.