doT.js template example

data.json

{
  "settings": {
    "foo": "low"
    ,"bar": "high"
    ,"baz": "low"
  }
}

gistfile1.js

{{##def.radiogroup:
  <h2>{{= name}}</h2>
  {{~['low', 'high'] :value}}
    <input type="radio" name="{{= name }}" value="{{= value }}"{{? it.settings[name] == value }} checked="checked"{{?}}/>
  {{~}}
#}}

{{##def.settings:
  <h1>Settings</h1>
  {{~Object.keys(it.settings) :name}}
    {{#def.radiogroup}}
  {{~}}
#}}

{{#def.settings}}

Inspired by https://gist.github.com/3696453