Saving Data in JSON Format using NODE

Question

I know this is asked many times but I couldn't find any code for same so I am adding mine and its output. Please take a look.

app.put('/hotel/save', function(req, res) {

    var fileToSave = 'savedHotelDetails.txt';
     res.send('Booking Id '+guid());
     res.status(200);
     var arr = [];
     var k;
     fs.readFile(fileToSave, 'utf-8', function(err, data) {
        if(err) {
            k = [];
        } else {
            arr.push(data);
            var obj = JSON.parse(req.query.params);
            console.log(obj);
            k = arr.push(obj);
            //JSON.stringify(k);
            //console.log(arr);
            fs.appendFile(fileToSave, JSON.stringify(arr),'utf8');
        }
     })
});

This gives me output as

["",{"hotelId":"IM50003"}]["[\"\",{\"hotelId\":\"IM50003\"}]",{"hotelId":"IB50002"}]["[\"\",{\"hotelId\":\"IM50003\"}][\"[\\\"\\\",{\\\"hotelId\\\":\\\"IM50003\\\"}]\",{\"hotelId\":\"IB50002\"}]",{"hotelId":"IB50002"}]

Firstly why this kind of output? Secondaly, my goal is to make this call from front end with new data and want it to get append like

[{"ID": "IM5004"},{"ID": "IM5005"},{"ID": "IM5006"}]

The above data should be after three calls.

shadowfox · Accepted Answer · 2016-06-22 07:32:33Z

1

Problem is you are reading the file content and pushing it to array and adding the new object to the array. Use file.write instead of file.append

ie instead of

 fs.appendFile(fileToSave, JSON.stringify(arr),'utf8');

use

 fs.write(fileToSave, JSON.stringify(arr),someCallbackfn)

answered Jun 22, 2016 at 7:32

shadowfox

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2 Comments

Shah Rukh K Over a year ago

Any "clean" way to do this?

shadowfox Over a year ago

json is just a serialization technique, if you want want persistence then try to store in a db (mongo, json-file-store) or in your case use .csv format so that you can simply append extra records without much performance penalty. refer to this stackoverflow.com/questions/24011343/…

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