form2.json

{
  "name": "signup",
  "type": "form",
  "fields": [
    {
      "name": "name",
      "type": "text_input",
      "label": "Name"
    },
    {
      "name": "email",
      "type": "email_input",
      "label": "Email",
      "required": true
    },
    {
      "name": "friends",
      "type": "form",
      "label": "Friends",
      "multi": true,
      "fields": [
        {
          "name": "name",
          "type": "text_input",
          "label": "Name"
        },
        {
          "name": "email",
          "type": "email_input",
          "label": "Email",
          "required": true
        }
      ]
    },
    {
      "name": "terms",
      "type": "checkbox",
      "label": "I agree to the terms of service",
      "required": true
    },
    {
      "type": "submit",
      "label": "Submit"
    }
  ]
}