read and write into file using Piping in NodeJs

var fs = require('fs');

var stream = fs.createReadStream('data.json'),
writable = fs.createWriteStream('data_copy.json');

stream.pipe(process.stdout);

stream.pipe(writable);

Reading txt File in chunk in nodeJs using stream (updated : added pause and resume)

var fs = require('fs');

var stream = fs.createReadStream('data.json');

//stream.pause(); To pause the streaming
//stream.resume(); To resume the streaming


stream.on('data', function (chunk) {

console.log('-----------------START----------------');
console.log(chunk.toString());
console.log('----------------FINISH----------------');

});


stream.on('data', function (chunk) {

console.log('CHUNK LENGTH WAS: ' + chunk.length);

});

stream.on('end', function () {

console.log('----------------END OF THE FILE----------------');

});

Create getter and setter module in NodeJS

var number, origin, destination;

exports.setNumber = function (num) {

number = num;

};

exports.setOrigin = function (o) {

origin = o;

};

exports.setDestination = function (d) {

destination = d;

};

exports.getInfo = function () {

return {

number      : number,

origin      : origin,

destination : destination

};

};

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user in app.js

var flight = require('./flight');

flight.setOrigin('Kensington');

flight.setDestination('London');

flight.setNumber(356);

console.log(flight.getInfo());