How to pause/resume for streaming?

Question

JavaScript

There is a simple endpoint that returns a large file:

app.get('/', (req, res) => {
    const filePath = req.app.get('filePath');
    const stream = createReadStream(resolve(filePath, smallFile));
    res.writeHead(200, {
        'content-type': mime.lookup(stream.path)
    });
    stream.on('error', res.end());
    stream.on('close', res.end());
    stream.pipe(res);
});

I need to create another endpoint for pause/resume this stream, but I can't figure out how to do it yet. Let's say I can push all created streams into an array, but how do I know which stream needs to pause/resume? As a solution, you need to assign some kind of ID to each stream, but how to give it to the front?