JavaScript JSON


JSON is a human-readable text that is an open-standard file format. It's also easy for machines to parse and generate.

JSON is a syntax used for storing and exchanging data and serializing objects, arrays, numbers, strings, booleans, and null. It is based upon JavaScript syntax but is still different from it and some JavaScript is not JSON.

Objects and Arrays: All property names shall have double-quoted strings and trailing commas are forbidden.

Numbers: Leading zeros are prohibited and will be ignored or throw an error. A decimal point must be followed by one digit or more.


Describe an object

This shows an how we can use JSON to describe an object. In this case a person.
JS JavaScript - Describe an object

	"firstName": "Chuck",
	"lastName": "Brown",
	"male": true,
	"age": 33,
	"address": {
	"streetAddress": "23 Bumble street",
	"city": "Honneytown",
	"state": "MN",
	"postalCode": "1234-456"
"phoneNumbers": [
	"type": "work",
	"number": "4567665543-4444"
	"type": "office",
	"number": "343434-4545"
	"type": "mobile",
	"number": "11111111-22222"
	"children": [],
	"spouse": null

Learn more about JavaScript Objects

JSON Schema

The JSON Schema is used to specifiy a JSON-based format.  It defines the structure of JSON data for validation, documentation, and interaction control. It's like a contract for the JSON data that is needed and in what way that data can be modified.

The concept is similar to the XSD concept and like in XSD, the same serialization/deserialization tools can be used both for the schema and data; and is self-describing.

This is an example of how that can look like.

JS JavaScript - JSON Schema

  "$schema": "",
  "title": "Car",
  "type": "object",
  "required": ["id", "type", "price"],
  "properties": {
    "id": {
      "type": "number",
      "description": "Car identifier"
    "name": {
      "type": "string",
      "description": "Name of the car"
    "price": {
      "type": "number",
      "minimum": 0
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
    "stock": {
      "type": "object",
      "properties": {
        "warehouse": {
          "type": "number"
        "retail": {
          "type": "number"

JSON Methods


Is for parsing a string as JSON, optionally transform the produced value and its properties, and return the value.


Will return a JSON string that corresponds to the specified value, optionally including only certain properties or replacing property values in a user-defined manner.


To convert a JavaScript value to a JSON string you should use the JSON.stringify() method.

JS JavaScript - JSON.stringify()

console.log(JSON.stringify({ x: 11, y: 12}));
// the output to expect: "{"x":11,"y":12}"
console.log(JSON.stringify([new Number(7), new String('true'), new Boolean(true)]));
// the output to expect: "[7,"true",true]"
console.log(JSON.stringify({ x: [2, undefined, function(){}, Symbol('')] }));
// the output to expect: "{"x":[2,null,null,null]}"
console.log(JSON.stringify(new Date(2018, 0, 4, 15, 4, 5)));
// the output to expect: ""2018-01-04T15:04:05.000Z""


The JSON.parse() method will parse a JSON string. This constructs the JavaScript value or object described by the string.

JS JavaScript - JSON.parse()

var json = '{"result":true, "count":88}';
obj = JSON.parse(json);
// the output to expect: 88
// the output to expect: true

Learn more about JavaScript Functions Learn more about JavaScript Strings

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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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