dealing with 'undefined' properties in Meteor.method

Question

I've created a function in my Meteor application, which is set to 'enrich' the data contained within a meteor collection. The function is meant to iterate over a collection, utilize the fullcontact API to pull additional data on all the client entries maintained within the db (i.e. LinkedIn Bio; no. of employees, etc.).

The issue lies around the fact that not all datapoint are available for all elements within the collection (e.g. a client may not have a LinkedIn profile). The function works for the initial couple of elements but eventually fails throwing a TypeError: Cannot read property '2' of undefined, because the data variable does not contain a LinkedIn Profile bio for the company (for this particular example).

What do you suggest as a workout? Any ideas? Your help would be much appreciated - I have been at this for a couple of hours.

Meteor.methods({
  enrichment() {
    var fullcontact = new FullContact(Meteor.settings.fullContact);
    for (var i = 1; i < customerDb.find({ company: "Qualify" }).count(); i++) {
      var url = customerDb.findOne( { company: "Qualify", 'item.clientId': i.toString() } )['item']['contact_website'];
      var data = fullcontact.company.domain(url);
      if ( data['status'] == 200 ) {
        customerDb.update ({ 
          company: "Qualify", 'item.clientId': i.toString()
        }, {
          $push: {
            bio: data['socialProfiles'][2]['bio'],
            keywords: data['organization']['keywords'],
            employees: data['organization']['approxEmployees'],
            domesticTrafficRank: data['traffic']['topCountryRanking'][0],
            globalTrafficRank: data['traffic']['ranking'][0]
          }
        });
      } else {
        console.log('Data could not be found on the company')
      }
    }
  }
});

Answer 1

Building on @chazsolo's suggestion, you can deal with potentially missing data and keys with javascript ANDs and ORs. This is a common defensive coding pattern.

Here each item will be replaced with an empty string if any of the parent keys are missing or the array element is missing. You can simplify this if you know more about what can be missing. Also you may want numbers instead of strings in some of these cases.

if ( data['status'] == 200 ) {
  const bio = data['socialProfiles'] && data['socialProfiles'][2] && data['socialProfiles'][2]['bio'] || '';
  const keywords = data['organization'] && data['organization']['keywords'] || '';
  const employees = data['organization'] && data['organization']['approxEmployees'] || '',
  const domesticTrafficRank = data['traffic'] && data['traffic']['topCountryRanking'] && data['traffic']['topCountryRanking'][0] || '',
  const globalTrafficRank = data['traffic'] && data['traffic']['ranking'] && data['traffic']['ranking][0] || '';

  customerDb.update (
    { company: "Qualify", 'item.clientId': i.toString() },
    { $push: { bio, keywords, employees, domesticTrafficRank, globalTrafficRank }}
  });