Below is JSON body returned from an API call. I'm using Postman and want to create a test using JavaScript to count the number of objects ("id"s) in the JSON returned. Something like tests["Only 1 login"] = objects=1 is a PASS, else Fail.
[
{
"id": 243,
"user_id": 76,
"account_id": 1,
"unique_id": "12345",
"special_user_id": null,
},
{
"id": 244,
"user_id": 84,
"account_id": 1,
"unique_id": "123456",
"special_user_id": "staff_123456",
}
]
Or just a count while reading through the array
var count = 0;
ids.forEach(x => {if (x.id != undefined) count++});
console.log(count); // 2
If the JSON is still a string and you need to parse it:
var data = JSON.parse(json);
If you just want to know the number of elements in the array:
data.length
If some elements might be missing ids, and you don't want to count them:
data.filter(elt => 'id' in elt).length
You can use a for loop to iterate if you need to ONLY count the number of times an id property is set upon EACH object in the array.
var ids = []
for(var i = 0; i < obj.length; i++) {
if(typeof entry.id !== 'undefined') {
ids.push(entry[i].id);
}
}
console.log(ids.length)
You can also just use obj.length if every object in the array is guaranteed to have an id property. You said count the number of ids, that's why the above for loop was implemented, just to be safe.
INPUT_ARRAY.length ?
undefined will be pushed hence makes no sense...
tests["Only 1 login"]or how it connects toPASSandFAIL. Do you mean you want to see if there is one element in the array? Is the array already parsed into a JS object, or are you stuck on how to do that (hint:JSON.parse). For getting the number of items in the array (usually known as its "length"), see MDN.