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Demo App JSON2

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3. Demo GenApp Application

c. GenApp JSON Definitions

JSON format & Examples

• JSON stands for JavaScript Object Notation

• Some JSON examples:

  • Example 1: set of simple "key":"value" pairs

{
    "name"        : "value",
    "othername"   : "othervalue",
    "almostpi"    : 3.14159
}

- **Example 2:** the *"value"* is an array

{
    "vectorname" : [ 1, 2, 4, "five"]
}

- **Example 3:** the *"value"* is arbitrarily nested

{
    "arbitrarily-nested" :
		[{ "this" : [ 1, 2, 4,"five"] },
  	      "that" ]
}

• Here are some JSON snippets from different definitions of the actual Demo application:
  • from {{{demo/menu.json}}}: it defines Demo's module "Energy"

{
    "modules" : [ 
                     { 
                        "id"    : "penergy",
                        "label" : "Energy"
                      }
                 ]
}

- from {{{demo/modules/penery.json}}}: defines GUI output field labeled "Energy [J]" (can be seen on the right picture [here](Tutorial-Demo-App))

{
      "role"       : "output"
      ,"id"         : "e"
      ,"label"     : "Energy [J]"
      ,"type"      : "text"
}

• Notes on syntax:
  • Trailing commas are not generally allowed
  • Use {{{check_json.pl 'filename'}}} from command line to verify syntax after editing (it's in your path)
  • We allow comments beginning a line with {{{#}}} in all JSON files except {{{appconfig.json}}}

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