How to update in-memory variable in NodeJS?

Question

Let's suppose I have a variable var loli = [ { pop: true}, {pup: false } ] .

Then, I have a route that makes something like this loli.push(req.boy) and another route that responds with the loli array, like this res.json(loli) .

I've searched some questions on Stack, Node Docs and could not figure out why.But my res.json(loli) is only sending the original array, even thought it has changed.

Hou can I watch for changes on this var or tell Node to not cache or do not do whatever it is doing?

Answer 1

It's difficult to say exactly what's wrong without seeing runnable code with the problem, but here's some code that does what you're asking. Fire it up, then go to http://localhost:3000/show to see the initial value of the object, then go to http://localhost:3000/push/foo to push the string value "foo" into the array, and go to http://localhost:3000/show again to see that it's there.

var express = require('express');
var app = express();

var loli = [ { pop: true}, {pup: false } ]

app.get('/push/:boy', function (req, res) {
  loli.push(req.params.boy);
  res.send('Pushed!');
});

app.get('/show', function (req, res) {
  res.json(loli);
});

var server = app.listen(3000, function () {
  var host = server.address().address;
  var port = server.address().port;

  console.log('Example app listening at http://%s:%s', host, port);
});