Javascript

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

JSON

JSON is JavaScript Object Notation and is a way of representing 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