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var fs = require('fs');
fs.readFile('data.json', function(err, json) {
if (err) throw err;
var data = JSON.parse(json);
// do stuff with data = 'bar';
var newJson = JSON.stringify(data);
fs.writeFile('newData.json', newJson, function(err) {
if (err) throw err;
console.log('all done');
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