code: function decodeToken (tokenStr) {
    if (!tokenStr || tokenStr === '') return null
    try {
      return jwtDecode(tokenStr)
    } catch (error) {
      logger.error({
        description: 'Error decoding token.',
        error, func: 'decodeToken', file: 'token'
      })
      return null
    }
  }
docs: Safley decode a JWT string
  @private
  @return {Object}