I’ve written the following piece of code in my nodeJS/Expressjs server:

app.post('/settings', function(req, res){
    var myData = {
        a: req.param('a')
        ,b: req.param('b')
        ,c: req.param('c')
        ,d: req.param('d')
    }

    var outputFilename="config.json";

    fs.writeFile(outputFilename, JSON.stringify(myData, null, 4), function(err) {
        if(err) {
          console.log(err);
        } else {
          console.log("Config file as been overwriten");
        }
    }); 
});

This allows me to get the submitted form data and write it to a JSON file.

This works perfectly. But the client remains in some kind of posting state and eventually times out. So I need to send some kind of success state or success header back to the client.

How should I do this?

Thank you in advance!