How to check if session exist from JavaScript

Question

I'm using NodeJs + Ejs and sometimes I would like to do some stuff from JavaScript only if user session exists.

Here is my nodejs session part:

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

app.use(session({
    secret: '*********',
    maxAge: 3600000 
}));
app.use(function(req, res, next){
    res.locals.session = req.session;
    next();
});

I can see session exists from ejs when, for example, Jack is logged in:

User: <%= session.user.name %>  --> User: Jack

But I don't know how to check if session.user exists from javascript. For example how to show alert if session.user exists ?

if (session.user)? But you don't show an alert from the server side, unless you just mean setting something for the client side. — Dave Newton
– Dave Newton, Commented Sep 9, 2017 at 15:56

Jonas Wilms · Accepted Answer · 2017-09-09 16:19:57Z

1

Simply tell it to the client side:

<script>
 const user = "<%= session.user.name %>";
 if(user) alert(user);
</script>

answered Sep 9, 2017 at 16:19

Jonas Wilms

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1 Comment

Amadou Beye Over a year ago

It seems the only solution. Thank you

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