JSON Format File

• All information in the file is recorded as properties of the form key: value
  • key - the pre-defined property whose name does not vary.
  • value - what we are assigning to the property.
• All our properties are string and therefore their values must be between "", ie "key": "value"
• The JSON file starts with { and ends with }
• Objects - We can group more than one property by separating them by commas:
  • Objects also begin with { and end with }
  • Objects can contain two or more properties.
• Arrays - We can group igual objects separating them by commas:
  • key will be the name of the array.
  • value is the array itself.
  • Arrays begin with [ and end with ]
  • Arrays may contain two or more objects.

Property

"key1": "value1"

Object

{
  "key2": "value2",
  "key3": "value3"
}

Array

"key4": [
  {
     "key5": "value5",
     "key6": "value6"
  },
  {
     "key5": "value7",
     "key6": "value8"
  },
  {
     "key5": "value9",
     "key6": "value10"
  }
]

JSON File Example (example.json)

• A property (key1)
• An array (key2) with two objects each with three properties (key3, key4, key5)
• An array (key6) with three objects each with two properties (key7, key8)

{
  "key1": "value1",
  "key2": [
    {
       "key3": "value3",
       "key4": "value4",
       "key5": "value5"
    },
    {
       "key3": "value6",
       "key4": "value7",
       "key5": "value8"
    }
  ],
  "key6": [
    {
       "key7": "value10",
       "key8": "value11"
    },
    {
       "key7": "value12",
       "key8": "value13"
    },
    {
       "key7": "value14",
       "key8": "value15"
    }
  ]	
}