How to pretty print json using javascript?

JSON means JavaScript Object Notation. This is one of the reasons why pretty-printing is implemented natively in JSON.stringify(). The third argument in it pretty prints and sets the spacing to use −

Example

let a = {
   name: "A",
   age: 35,
   address: {
      street: "32, Baker Street",
      city: "Chicago"
   }
}
console.log(JSON.stringify(a, null, 4))

Output

{
   "name": "A",
   "age": 35,
   "address": {
      "street": "32, Baker Street",
      "city": "Chicago"
   }
}

Note that we used a JS object here. This works fine for JSON Strings as well, but they first needed to be parse to JS objects using JSON.parse.

Example

let jsonStr = '{"name":"A","age":35,"address":{"street":"32, Baker Street","city":"Chicago"}}'
console.log(JSON.stringify(JSON.parse(jsonStr), null, 2))

Output

{
   "name": "A",
   "age": 35,
   "address": {
      "street": "32, Baker Street",
      "city": "Chicago"
   }
}