javascript: empty array value

I have the following loop which calls an api and pushes data to an array, the issue is that the API is returning empty values for certain attributes i.e "primaryTag": null and is breaking my code, how can I handle it to place a static value if any of the values are null?

for (var a in audience) {
        
      var aId = audience[a];
      var url = base+'?'+query+'&AudienceId='+aId
      var req = new HttpClientRequest(url);
      req.header["Content-Type"] = "application/json"
      req.method = "GET"
      req.execute();
      var resp = req.response;  
       
      if( resp.code != 200 )
      throw "HTTP request failed with " + resp.message
         
      var posts = JSON.parse(resp.body)
      logInfo(resp.code+' '+url);

      
        for (i = 0; i < 11; i++) {
          articlesList_json.push({
                "title":posts[i].title, 
                "pubDate":posts[i].publishedDate, 
                "link":posts[i].url, 
                "imageURL":posts[i].imageUrl, 
                "description": posts[i].description,
                "category": posts[i].category.name,
                "audience": posts[i].audience.name+'-'+posts[i].audience.id,
                "tag": posts[i].primaryTag.name,
                "episerverId":posts[i].episerverId,
            });
        } 
      
}//for loop end

>Solution :

Have a look at optional chaining

"tag": posts[i].primaryTag?.name ?? "N/A"

Alternatively use a ternary:

"tag": posts[i].primaryTag ? posts[i].primaryTag.name : "N/A"