Handlebars.js parse object instead of [Object object]

When outputting {{user}}, Handlebars will first retrieve the user's .toString() value. For plain Objects, the default result of this is the "[object Object]" you're seeing.

To get something more useful, you'll either want to display a specific property of the object:

{{user.id}}
{{user.name}}

Or, you can use/define a helper to format the object differently:

Handlebars.registerHelper('json', function(context) {
    return JSON.stringify(context);
});

myView = new myView({
    user : {{{json user}}} // note triple brackets to disable HTML encoding
});

You can simple stringify the JSON:

var user = {}
user = {'id' : 123, 'name' : 'First Name'};
// for print
user.stringify = JSON.stringify(user);

Then in template print by:

{{{user.stringify}}};

I'm using server-side templating in node-js, but this may apply client-side as well. I register Jonathan's json helper in node. In my handler, I add context (such as addressBook) via res.locals. Then I can store the context variable client-side as follows:

<script>
  {{#if addressBook}}
  console.log("addressBook:", {{{json addressBook}}});
  window.addressBook = {{{json addressBook}}};
  {{/if}}
</script>

Note the triple curlies (as pointed out by Jim Liu).