JavaScript: Pretty print JSON

Run JSON.stringify(object, null, 2). Adjust the number for a different level of indentation.

Example:

const object = {
foo: 'bar',
ham: {
spam: [10, 20],
},
}

JSON.stringify(object)
//=> {"foo":"bar","ham":{"spam":[10,20]}}

JSON.stringify(object, null, 2)
//=> {
// "foo": "bar",
// "ham": {
// "spam": [
// 10,
// 20
// ]
// }
// }

Read more about JSON.stringify() on MDN