concatenate strings in node.js

I am trying to concatenate strings in Node.js . I started with a very basic example, I am trying to read a file, and simply concatenate all the lines one by one to a new object, but from some reason when I do console.log, only the last line appears. Its like each new line runs over the other.

here is the code

fs.readFile("C:/example.srt", function(error, data) {
    if (error) { throw error; }else {
        var newData = "";
        data.toString().split("\n").forEach(function (line) {
            newData = newData + line;
        });

        console.log(newData);
    }
});