JsRender has a {{props}}
tag for iterating through fields/properties of an object.
See the API topic and samples here: http://www.jsviews.com/#propstag
You can use it in this template:
<script id="myTmpl" type="text/x-jsrender">
{{props ...}}
<tr>
<td>{{:key}}</td>
{{for prop}}
<td>{{:}}</td>
{{/for}}
</tr>
{{/props}}
</script>
I created a fiddle here: http://jsfiddle.net/BorisMoore/j7eE8/
(See here for more about helpers: http://www.jsviews.com/#helpers. If you want you can pass the helper in with the render call, as context, rather than registering it with $.views.helpers.)