HubSpot associations API returns empty contact objects

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1

I’m working with the @hubspot/api-client package version 8.1.0 in Node.js and running into issues when trying to get contacts linked to deals.

Here’s my test code:

const opportunities = await DataService.getOpportunitiesByPhase('Contract Signed', 500, 50, item => true);
const contactsData = {};

for (let opportunity of opportunities) {
    console.log(`Working on opportunity ${opportunity.id}`);
    const linkedContacts = await DataService.hubspotClient.crm.deals.associationsApi.getAll(opportunity.id, 'contact');
    contactsData[opportunity.id] = linkedContacts.results;
}

await fs.writeFile('./output.json', JSON.stringify(contactsData, null, 2));

The getOpportunitiesByPhase function works perfectly and returns deals correctly. I can see each deal ID being processed in the console.

However, the associationsApi.getAll call behaves strangely. Instead of getting actual contact data, I receive empty objects with no properties at all. The response contains the right number of items but they’re completely empty. Here’s what the output looks like:

"4521789123": [],
"4521654987": [
  {}
],
"4521432156": [
  {},
  {}
],
"4521876543": [],

I expected to get contact IDs and other properties, but the objects are totally blank. I also tried using ‘contacts’ instead of ‘contact’ but got identical results. What could be causing this behavior?

2

yep, that sounds right. the associations api just gives you references, not full contact data. those empty objs are like placeholders. u gotta pull the contact details separately using those ids to actually see the info.