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JS Forms

JS Forms Forms API

JS Objects

Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object ECMAScript 5 Object Classes

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

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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 Parse JSON Stringify JSON Objects JSON Arrays JSON PHP JSON HTML JSON JSONP

JS Web APIs

Web API Intro Web History API Web Storage API Web Geolocation API

JS vs jQuery

jQuery Selectors jQuery HTML jQuery CSS jQuery DOM

JS Examples

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

JS References

JavaScript Objects HTML DOM Objects


JavaScript Display Objects


How to Display JavaScript Objects?

Displaying a JavaScript object will output [object Object].

Example

var person = {name:"John", age:30, city:"New York"};

document.getElementById("demo").innerHTML = person;
Try it Yourself »

Some common solutions to display JavaScript objects are:

  • Displaying the Object Properties by name
  • Displaying the Object Properties in a Loop
  • Displaying the Object using Object.values()
  • Displaying the Object using JSON.stringify()


Displaying Object Properties

The properties of an object can be displayed as a string:

Example

var person = {name:"John", age:30, city:"New York"};

document.getElementById("demo").innerHTML =
person.name + "," + person.age + "," + person.city;
Try it Yourself »

Displaying the Object in a Loop

The properties of an object can be collected in a loop:

Example

var x, txt = "";
var person = {name:"John", age:30, city:"New York"};

for (x in person) {
txt += person[x] + " ";
};

document.getElementById("demo").innerHTML = txt;
Try it Yourself »

You must use person[x] in the loop.

person.x will not work (Because x is a variable).


Using Object.values()

Any JavaScript object can be converted to an array using Object.values():

var person = {name:"John", age:30, city:"New York"};

var myArray = Object.values(person);

myArray is now a JavaScript array, ready to be displayed:

Example

var person = {name:"John", age:50, city:"New York"};

var myArray = Object.values(person);
document.getElementById("demo").innerHTML = myArray;
Try it Yourself »

Object.values() is supported in all major browsers since 2016.

54 (2016) 14 (2016) 47 (2016) 10 (2016) 41 (2016)


Using JSON.stringify()

Any JavaScript object can be stringified (converted to a string) with the JavaScript function JSON.stringify():

var person = {name:"John", age:30, city:"New York"};

var myString = JSON.stringify(person);

myString is now a JavaScript string, ready to be displayed:

Example

var person = {name:"John", age:30, city: "New York"};

var myString = JSON.stringify(person);
document.getElementById("demo").innerHTML = myString;
Try it Yourself »

The result will be a string following the JSON notation:

{"name":"John","age":50,"city":"New York"}

JSON.stringify() is included in JavaScript and supported in all major browsers.

Yes 8.0 3.5 4.0 10.5

Stringify Dates

JSON.stringify converts dates into strings:

Example

var person = {name:"John", today:new Date()};

var myString = JSON.stringify(person);
document.getElementById("demo").innerHTML = myString;
Try it Yourself »

Stringify Functions

JSON.stringify will not stringify functions:

Example

var person = {name:"John", age:function () {return 30;}};

var myString = JSON.stringify(person);
document.getElementById("demo").innerHTML = myString;
Try it Yourself »

This can be "fixed" if you convert the functions into strings before stringifying.

Example

var person = {name:"John", age:function () {return 30;}};
person.age = person.age.toString();

var myString = JSON.stringify(person);
document.getElementById("demo").innerHTML = myString;
Try it Yourself »

Stringify Arrays

It is also possible to stringify JavaScript arrays:

Example

var arr = ["John", "Peter", "Sally", "Jane"];

var myString = JSON.stringify(arr);
document.getElementById("demo").innerHTML = myString;
Try it Yourself »

The result will be a string following the JSON notation:

["John","Peter","Sally","Jane"]