I'm currently developing an application with React and Mongoose (MongoDB) where I upload a text file, that contains roughly around 9000+ lines, containing JSON. Each line is important and I need to be able to store it in the database to be accessible later.

I have set up two functions, one that reads the file and one that creates a model for each request and saves it to MongoDB.

**Function to read each line**

```
const createAndReadFile = async (filePath) => {
    //create a read stream of the File
    let fileStream = fs.createReadStream(filePath, 'utf8');

    const rl = readline.createInterface({
        input: fileStream,
        crlfDelay: Infinity
    });

    for await (const line of rl) {
        let parsedJSONLine = JSON.parse(line);
            createAndAddToDB(parsedJSONLine);
    }
};

```

**Function to add to the database each line**

```
const createAndAddToDB = async (jsonRequest) => {
    try {
        let request = new Request(jsonRequest);

        await request.save();
    } catch (error) {}
};

```

**My question is, what's the most effective way to wait until all the lines have been converted to a model and saved in the database ?**