url-slugify/src/URLSlugify.js

Creates SEO friendly URL slugs with multiple language support

const Hashids = require('hashids');

const library = require('./characters.json');

/**
 * URLSlug Class
 *
 */
class URLSlug {
  /**
   * Creates SEO and URL friendly slugs
   * @param title string
   * @param separator string
   */
  slugify(title = '', separator = '-') {

    const hashLength = 9; // length of hash
    const id = this.generateRandom(); // generate a random id

    let slug; //initialise slug

    const defaultSeparator = library.characters.find(item => item.character === separator) === undefined ? separator : '-'; // if character exists in library use default separator

    if (typeof title !== 'undefined' && title !== '' && typeof id !== 'undefined' && id !== 0) {

      const hashedId = new Hashids(title, hashLength).encode(`${id}${Math.floor(Date.now() / 1000)}`); // Generates a hash using id and timestamp

      let newTitle = `${title}${defaultSeparator}${hashedId}`; // Creates a unique hashing using the title

      newTitle = newTitle.replace(/^\s+|\s+$/g, '') // trim
        .toLowerCase(); // make title lowercase

      let transformedTitle = library.characters.reduce((acc, item) => { // replace special characters, accents with alternatives
        while (newTitle.indexOf(item.character) !== -1) {
          newTitle = newTitle.replace(item.character, item.value);
        }
        return newTitle;
      }, {});

      transformedTitle = transformedTitle.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
        .replace(/\s+/g, defaultSeparator); // collapse any whitespace and replace by separator

      slug = defaultSeparator === '\'\''
        ? transformedTitle.replace(new RegExp("\'+", "g"), '') // collapse multiple '' if present
        : transformedTitle.replace(new RegExp(defaultSeparator+'+',"g"), defaultSeparator); // collapse multiple separators
    }
    return slug;
  }

  generateRandom() {
    let num = Math.floor(Math.random() * (999999 - 1 + 1)) + 1;
    return num === 0 ? this.generateRandom() : num;
  }
}

module.exports = URLSlug;