Node JS session error: express-session deprecated

Question

I have the following in my node js file

var express = require('express');
var util = require('./lib/utility');
var partials = require('express-partials');
var bodyParser = require('body-parser');

var session = require('express-session');

/* abstracted some code */

app.use(session({
  genid: function(req) {
    return genuuid(); // use UUIDs for session IDs
  },
  secret: 'keyboard cat'
}));

When I start the server, I get

express-session deprecated undefined resave option; provide resave option server.js
express-session deprecated undefined saveUninitialized option; provide saveUninitialized option server.js

I am having a hard time figuring out what is deprecated? I copied the example from https://github.com/expressjs/session

When I try to load the page I get:

ReferenceError: genuuid is not defined at app.use.session.genid

Answer 1

From express 4.0 , express-session with odd warning message

As the warnings say, the default values will change so they want to ensure that by setting the values explicitly now, you won't run into unexpected behavior when the defaults do change (in the near future).

app.use(session({
    secret: cookie_secret,
    resave: true,
    saveUninitialized: true
}));

Answer 2

You have to define the genuuid function somewhere. The express-session readme is assuming you have already implemented that.

Regarding the warnings, you need to explicitly set the resave and saveUninitialized options in your session configuration object.