How does one convert an object into CSV using JavaScript?

This is a simple implementation:

// Returns a csv from an array of objects with
// values separated by tabs and rows separated by newlines
function CSV(array) {
    // Use first element to choose the keys and the order
    var keys = Object.keys(array[0]);

    // Build header
    var result = keys.join("\t") + "\n";

    // Add the rows
    array.forEach(function(obj){
        result += keys.map(k => obj[k]).join("\t") + "\n";
    });

    return result;
}