How to get the size of a json object in JavaScript?

To get the number of keys in a JSON object in javascript you can use one of the following 2 methods.

Using Object.keys()

The Object.keys() method returns an array of a given object's own enumerable property names, in the same order as we get with a normal loop.

Example

let a = {
   name: "John",
   age: 32,
   city: "Hong Kong"
}
console.log(Object.keys(a).length)

Output

This will give the output −

3

Using for in loop

The for...in statement iterates over all non-Symbol, enumerable properties of an object. For example,

Example

let a = {
   name: "John",
   age: 32,
   city: "Hong Kong"
}
let count = 0;
for(let key in a) {
   count ++;
}
console.log(count)

Output

This will give the output −

3