A utility to hide primary keys and database ids using the Hashids package

Hash.ts

const Hashids = require("hashids/cjs");

export class Hash {
  private hashids;

  /**
   * Creates a Hash object.
   *
   * @param {string} salt The unique salt/alphabet to use for salting. Setting a salt allows output hashes to be more unique.
   * @param {number} padding The minimum output length of the hash (default is 6).
   */
  constructor(salt: string = "", padding: number = 6) {
    this.hashids = new Hashids(salt, padding);
  }

  /**
   * Encodes the provided ID argument and returns a string representing the hash.
   *
   * @param {number} id The numeric "id" to be encoded or turned into a hash.
   * @returns {string} Returns the encoded ID in the form of a hash, e.g. "o2fXhV"
   */
  public encodeId(id: number) {
    return this.hashids.encode(id);
  }

  /**
   * Decodes the provided hash argument and returns a number representing the ID.
   *
   * @param {string} id The numeric "id" to be encoded or turned into a hash.
   * @returns {number} Returns the numeric ID, e.g. "1"
   */
  public decodeId(hash: string) {
    const decoded = this.hashids.decode(hash);
    return decoded.length > 1 ? decoded : decoded[0];
  }

  /**
   * Sets the internal hashids object with the provided salt/padding arguments.
   *
   * @param {string} salt The unique salt/alphabet to use for salting. Setting a salt allows output hashes to be more unique.
   * @param {number} padding The minimum output length of the hash (default is 6).
   */
  public setHashids(salt: string = "", padding: number = 6) {
    this.hashids = new Hashids(salt, padding);
  }
}