you have a bracket that closes your for-in loop just before this line:

if(key == 'organic_results'){

so the steps your script executes are the following:

1. start for-in loop

2. set key variable to a key from this.writeItOutput iteration

3. check whether the key equals to "inline_people_also_search_for"

4. go to step 2 until all keys in this.writeItOutput are iterated

5. finish the loop

6. run if blocks

So when you reach the step 5, your key variable equals ONLY ONE key in this.writeItOutput. What you may want to do is to put all these if blocks inside your for-in loop:

for (var key in this.writeItOutput){ 
   if(key == "inline_people_also_search_for"){
     console.log("inline_people_also_search_for")
   }

// } - this bracket is the problem
 
  if(key == 'organic_results'){
    console.log("inside organic_results");
  }

  if(key =="related_questions"){
    console.log("inside related questions");
  }


  if(key =="related_searches"){
    console.log("Inside related_searches");
  }
      
}