[node] save / read json

read.js

(async () => {

  const jsonContent = await fs.readFileSync('file_to_read.json');
  const object = JSON.parse(jsonContent);
  console.log(object);

})();

save.js

(async () => {
  
  const data = {
    name: 'John Doe',
    age: 39,
  };

  const jsonContent = JSON.stringify(data, null, 4);

  await fs.writeFileSync('file_to_read.json', jsonContent, 'utf8', function(err) {
    if (err) {
      return err;
    }
  });

})();