Which method is appropriate for inserting multiple documents into MongoDB?

The method for inserting multiple documents into MongoDB is insertMany(). This function is specifically designed to take an array of documents and insert them into a specified collection in a single operation. It simplifies bulk operations and is efficient for inserting large numbers of documents at once, which can significantly improve performance compared to inserting them one by one.

When using insertMany(), the documents are inserted in the order they appear in the provided array and the operation can also include options such as ordered or unordered inserts, giving users flexibility in how they want to handle potential write errors. This is particularly useful in scenarios where the insertion of all documents is required, and you want to ensure consistency and efficiency in your database operations.

Other methods mentioned, such as .addMany(), .insertAll(), and .addDocuments(), do not exist in the MongoDB API for document insertion and therefore would not be effective or appropriate methods to use for inserting multiple documents into a MongoDB collection.