{

How to Display JavaScript object with examples


Sometimes, During JavaScript application development, We want to debug and display the JavaScript object into the console.

The object contains enumerated keys and values enclosed with parenthesis.

For example, an object contains the following things.

The below object contains key and values as well as nested child objects

var obj = {id:1,name:"John",salary:"5000",department:{id:1,name:"sales"}};

console.log to print the javascript object

console object has a log function that prints the object or any javascript variable

 console.log("employee Object :"+obj);

It prints the object metadata in the form of a string. However, This is not useful to debug and know the object content values. output :

 employee Object :[object Object]

if you add comma(,) to log function, It will prints object in json format

console.log("employee object json",obj);

output :

{
id:1,
name:"John",
salary:"5000",
department: {
id:1,
name:"sales"
}
} 

You can also use console.dir to display an interactive list of the javascript object. It enables to expand.

You can check my other posts about difference between console.log and console.dir

 console.dir("employee Object :"+obj);
 console.dir("employee object json",obj);

How to display javascript object in json format

JSON.stringify function is used to print the javascript object in json format.

This will display the stringify version of a javascript object.

console.dir(obj);  
 console.dir(typeof obj);  // object

 let jsonObj=JSON.stringify(obj)
 console.dir(jsonObj);
 console.dir(typeof jsonObj); //string

Output

{
id:1,
name:"John",
salary:"5000",
department: {...}
}
object
{"id":1,"name":"John","salary":"5000","department":{"id":1,"name":"sales"}}
string

Display key and values of an object

The object provides keys and values functions to print the key and values of the javascript object.

console.log(Object.keys(obj));
console.log(Object.values(obj));

Output

[
"id",
"name",
"salary",
"department"
]
(4) [
1,
"John",
"5000",
{
id:1,
name:"sales"
}
]

It is a standard way to use for loop of an object.

Iterate an object using for-in loop and print the key and values using console.log statement.

for (var item in obj){
    console.log(obj[item], item);
}

Output

for (var item in obj){
    console.log(obj[item],item);
}

Output

1 id
Johnname
5000salary
{
id:1,
name:"sales"
}
department

Conclusion

To Sum up, Javascript objects iterate in multiple ways, you can choose based on your simplicity. All are works on the latest browsers.

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