Save pretty printed json to file in node

writeJsonToFile.js

var outputLocation = require('path').resolve(__dirname, 'file.json');
require('fs').writeFile(outputLocation, JSON.stringify(data, null, 4), function(err) {
    if(err) {
      console.log(err);
    } else {
      console.log("JSON saved to "+outputLocation);
    }
});

cool thanks