JavaScript/Vue.js print object in the console

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JavaScript/Vue.js print object in the console

If you’re a web developer like me, you probably use console a lot. We use it to debug JavaScript code, to print out the contents of an object etc.

I use built-in Chrome tools, which is enough for most of the cases. I also use a Vue Devtools extension, when I build Vue.js apps, and I love it.

Here is a short and sweet tip on how to print JavaScript object using console.log().

How to print out content of JavaScript object

Suppose you have a JavaScript object:

var person = {
  name: 'Nedd',
  surname: 'Stark',
  child: {
    child1: 'child1Value'
  }
}

To print out the content of person, you first need to stringify it using JSON.stringify() method.

str = JSON.stringify(person, null, 2); // it will also indent the output

Then pass it to console.log()

console.log(str);

Your console output will be

JavaScript print object in console

If you need to reverse the operation use JSON.parse() method

person = JSON.parse(str);

Bonus console tips

#1 console.clear()

When your console log becomes too long you can clear its content using console.clear()

console.clear() function

#2 console.count()

If you want to count how many times your function has been called, you can use the console.count() function. It also takes an optional parameter “label”. Here is an example:

let user = "";

function greet() {
  console.count(user);
  return "hi " + user;
}

user = "bob";
greet();
user = "alice";
greet();
greet();
console.count("alice");

You’ll see output like this:

console.count() function

#3 console.table()

This one is my favourite, you can print a proper table with the objects using console.table() function.

var people = [
  { name: "Nedd", surname: "Stark" },
  { name: "Robb", surname: "Stark" }
]

console.table(people)

You’ll see this beautiful table inside the console.

console.table() function

If you find this post useful, please let me know in the comments below.
Cheers,
Renat Galyamov

PS: Make sure you check other posts e.g. how to check if a user has scrolled to the bottom in Vue.js or how to do Vue.js polling using setInterval().

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