Trying to insert specific data into JSON

I have been taking your NodeJS classes and learning JS as well, I was able to mess around with a giphy API that I found and got as far as outputting the res.data into a JSON file..However I want to be able to only save specific data from the output of the API...

```
function getGiph() {
giphy.search({
q: 'pratt',
}, function (err, res) {
var gif = res.data;
for (var i = 0; i < gif.length; i++) {
var embed = gif[i].embed_url;
fs.writeFile('./apidata.json', JSON.stringify(embed, undefined, 1), function (err) {
if (err) throw err;
console.log('saved');
});
}
});
}
```

This is my code, when I console.log(embed); it outputs only the embed_urls, but when I write to the JSON it outputs "https://giphy.com/embed/XqOCxN1WpEzja"MsM0"" and that is all...

If I replace 'embed' with 'gif' then of course it outputs the entire API data.

Not sure what is happening, is anyone able to help?