How to check if item in an array exists in an array of objects

I get data from an API and then save it in the database. I do this every few hours. Sometimes the data from the API is the same and in which case I don't want to add the record again to the database and have duplicate records. So currently I am fetching the data from the database and creating an array which holds one of the unique identifiers like this:

const databaseArticles = await News.find({});
const databaseArticleSourceUrls = databaseArticles.map((item) => {
    return item.sourceUrl;
});

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The array of objects from the API looks something like this:

    const newsItems = [
      {
        title: titleOne,
        sourceUrl: urlOne
      },
      {
        title: titleTwo
        sourceUrl: urlTwo
      },
    ];

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    const newsForDb = newsItems.map((item) => {
      return {
        title: item.title,
        sourceUrl: item.sourceUrl,
      };
    });

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So, basically if the url in the API exists in the database, I want to ignore it and move on to the next one, and then finally insert all the new ones into the database and prevent duplicates. 

I am not sure if there is an easy way to do this with Mongoose/Mongo or if I need to use Javascript to compare the two and then create a new array that I insert into the database. 

For reference this is the insert:

     try {
       await News.insertMany(newsForDb);
     } catch (err) {
      console.log(err);
     }

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