Javascript

Javascript is a Programming Language specifically made for the web by Netscape.

JSON

JSON is JavaScript Object Notation and is a way of representating objects in plain text.

{
  "firstName": "John",
  "lastName": "Smith",
  "isAlive": true,
  "age": 27,
  "phoneNumbers": [
    {
      "type": "home",
      "number": "1-123-1234"
    },
    {
      "type": "office",
      "number": "456-789-1098"
    }
  ],
  "children": [],
  "spouse": null
}

Good reference: JSON