Как обработать данные json с помощью javascript?

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const jsonString = '{"name": "John", "age": 30, "city": "New York"}';
const obj = JSON.parse(jsonString);
console.log(obj.name); // "John"

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const obj = { name: "John", age: 30, city: "New York" };
const jsonString = JSON.stringify(obj);
console.log(jsonString); // '{"name":"John","age":30,"city":"New York"}'

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fetch('example.json')
  .then(response => response.json())
  .then(data => console.log(data));

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const obj = { name: "John", age: 30, city: "New York" };
const jsonString = JSON.stringify(obj);
const fs = require('fs');
fs.writeFile('example.json', jsonString, err => {
  if (err) {
    console.error(err)
    return
  }
  console.log('Data written to file')
});