JSON Objects
THE WORLD'S LARGEST WEB DEVELOPER SITE
HTML CSS JAVASCRIPT SQL PHP BOOTSTRAP HOW TO JQUERY W3.CSS ANGULAR XML MORE FORUM EXAMPLES REFERENCES
×

JS Tutorial

JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Scope JS Events JS Strings JS String Methods JS Numbers JS Number Methods JS Arrays JS Array Methods JS Array Sort JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS Conditions JS Switch JS Loop For JS Loop While JS Break JS Type Conversion JS Bitwise JS RegExp JS Errors JS Debugging JS Hoisting JS Strict Mode JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words JS Versions JS JSON

JS Forms

JS Forms Forms API

JS Objects

Object Definitions Object Properties Object Methods Object Constructors Object Prototypes

JS Functions

Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Closures

JS HTML DOM

DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists

JS Browser BOM

JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies

JS AJAX

AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples

JS JSON

JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Objects JSON Arrays JSON Parse JSON Stringify JSON PHP JSON HTML JSON JSONP

JS Examples

JS Examples JS HTML DOM JS HTML Input JS HTML Objects JS HTML Events JS Browser JS Quiz JS Certificate

JS References

JavaScript Objects HTML DOM Objects


JSON Objects

❮ Previous Next ❯

Object Syntax

Example

{ "name":"John", "age":30, "car":null }

JSON objects are surrounded by curly braces {}.

JSON objects are written in key/value pairs.

Keys must be strings, and values must be a valid JSON data type (string, number, object, array, boolean or null).

Keys and values are separated by a colon.

Each key/value pair is separated by a comma.

Accessing Object Values

You can access the object values by using dot (.) notation:

Example

myObj = { "name":"John", "age":30, "car":null };
x = myObj.name;
Try it Yourself »

You can also access the object values by using bracket ([]) notation:

Example

myObj = { "name":"John", "age":30, "car":null };
x = myObj["name"];
Try it Yourself »

Looping an Object

You can loop through object properties by using the for-in loop:

Example

myObj = { "name":"John", "age":30, "car":null };
for (x in myObj) {
    document.getElementById("demo").innerHTML += x;
}
Try it Yourself »

In a for-in loop, use the bracket notation to access the property values:

Example

myObj = { "name":"John", "age":30, "car":null };
for (x in myObj) {
    document.getElementById("demo").innerHTML += myObj[x];
}
Try it Yourself »

Nested JSON Objects

Values in a JSON object can be another JSON object.

Example

myObj = {
    "name":"John",
    "age":30,
    "cars": {
        "car1":"Ford",
        "car2":"BMW",
        "car3":"Fiat"
    }
 }

You can access nested JSON objects by using the dot notation or bracket notation:

Example

x = myObj.cars.car2;
//or:
x = myObj.cars["car2"];
Try it Yourself »

Modify Values

You can use the dot notation to modify any value in a JSON object:

Example

myObj.cars.car2 = "Mercedes";
Try it Yourself »

You can also use the bracket notation to modify a value in a JSON object:

Example

myObj.cars["car2"] = "Mercedes";
Try it Yourself »

Delete Object Properties

Use the delete keyword to delete properties from a JSON object:

Example

delete myObj.cars.car2;
Try it Yourself »

❮ Previous Next ❯