const { jsonSizeOf } = require('json-sizeof');

const obj = {
  str1: 'I am a string!',
  obj1: {
    str2: 456,
    obj2: null,
    obj3: undefined
  },
};

const bytes = jsonSizeOf(obj);
// expected 57

const obj = {};
for (let i = 0;i < 8000000;i++) {
  obj['test' + i] = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
}

// expected: 342888891
jsonSizeOf(obj);

// The following line will cause "JavaScript heap out of memory" fatal error
// if you do not maually increase the memory usage of node app.
Buffer.byteLength(JSON.stringify(obj));