How to Display JavaScript Objects?
Displaying a JavaScript object will output [object Object].
Example
// Create an Object
const person = {
name: "John",
age: 30,
city: "New York"
};
document.getElementById("demo").innerHTML = person;
Some 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
// Create an Object
const person = {
name: "John",
age: 30,
city: "New York"
};
// Display Properties
document.getElementById("demo").innerHTML =
person.name + "," + person.age + "," + person.city;
Displaying Properties in a Loop
The properties of an object can be collected in a loop:
Example
// Create an Object
const person = {
name: "John",
age: 30,
city: "New York"
};
// Build a Text
let text = "";
for (let x in person) {
text += person[x] + " ";
};
// Display the Text
document.getElementById("demo").innerHTML = text;
Note:
You must use person[x] in the loop.
person.x will not work (Because x is the loop variable).
Using Object.values()
Object.values() creates an array from the property values:
// Create an Object
const person = {
name: "John",
age: 30,
city: "New York"
};
// Create an Array
const myArray = Object.values(person);
// Display the Array
document.getElementById("demo").innerHTML = myArray;
Using Object.entries()
Object.entries() makes it simple to use objects in loops:
Example
const fruits = {Bananas:300, Oranges:200, Apples:500};
let text = "";
for (let [fruit, value] of Object.entries(fruits)) {
text += fruit + ": " + value + "<br>";
}
Using JSON.stringify()
JavaScript objects can be converted to a string with JSON method JSON.stringify().
JSON.stringify() is included in JavaScript and supported in all major browsers.
Note:
The result will be a string written in JSON notation:
{"name":"John","age":50,"city":"New York"}
Example
// Create an Object
const person = {
name: "John",
age: 30,
city: "New York"
};
// Stringify Object
let myString = JSON.stringify(person);
// Display String
document.getElementById("demo").innerHTML = myString;