for loop for iterating over each field in json code example

Example 1: going through every attributes of an object javascript

let a = {x: 200, y: 1}
let attributes = Object.keys(a)
console.log(attributes)
//output: ["x", "y"]

Example 2: loop though json object in javascript

var p = {
    "p1": "value1",
    "p2": "value2",
    "p3": "value3"
};