JSON.parse API Example

json_parse.js

// requires the 'expected' library <script src="https://npmcdn.com/expect@1.15.2/umd/expect.min.js"></script>

var input = '[{"id":1,"title":"Gone with the Wind","publishDate":"1936-06-10T00:00:00.000Z","related":[80,3]},{"id":2,"title":"Freelancer","publishDate":"2015-08-11T00:00:00.000Z","related":[45,89]},{"id":3,"title":"A Christmas Carol","publishDate":"1843-12-19T00:00:00.000Z","related":[20,33]},{"id":4,"title":"The Cat in the Hat","publishDate":"1957-03-12T00:00:00.000Z","related":[50,10]}]'

testBasicAPI()
testReviverArgument()

console.log('Tests passed')

// function declarations
function testBasicAPI() {
  var expected = [
    {id: 1, title: 'Gone with the Wind', publishDate: '1936-06-10T00:00:00.000Z', related: [80, 3]},
    {id: 2, title: 'Freelancer', publishDate: '2015-08-11T00:00:00.000Z', related: [45, 89]},
    {id: 3, title: 'A Christmas Carol', publishDate: '1843-12-19T00:00:00.000Z', related: [20, 33]},
    {id: 4, title: 'The Cat in the Hat', publishDate: '1957-03-12T00:00:00.000Z', related: [50, 10]},
  ]
  
  var result = JSON.parse(input)
  
  expect(result).toEqual(expected)
}

function testReviverArgument() {
  // with reviver argument
  var expected = [
    {id: 1, title: 'Gone with the Wind', publishDate: new Date('1936-06-10'), related: [80, 3]},
    {id: 2, title: 'Freelancer', publishDate: new Date('2015-08-11'), related: [45, 89]},
    {id: 3, title: 'A Christmas Carol', publishDate: new Date('1843-12-19'), related: [20, 33]},
    {id: 4, title: 'The Cat in the Hat', publishDate: new Date('1957-03-12'), related: [50, 10]},
  ]
  
  var result = JSON.parse(input, reviver)

  expect(result).toEqual(expected)

  // function declarations
  function reviver(key, value) {
    if (key === '') { // handle root level object
      return value
    }
    if (key === 'publishDate') {
      return new Date(value)
    }
    return value
  }
}