Write JSON with Node.js

Question

I'm trying to push names in a json file. I'm trying to do something like:

socket.on('create json', function(data){
    var data = JSON.stringify(Data, null, 2);
    fs.writeFile('participants.json', data)
    console.log(data);
});

This is only outputting the data that I've send and results in:

{
  "type": "Buffer",
  "data": [34,69,120,97,109,112,108,101,32,110,97,109,101, 34 ]
}

When I'm writing the file it deletes everything and puts that in. I'm looking for a way to write:

{
"names":["name1", "name2", "name3"]
}

Any ideas on how to fix and write this?

Help is very much appreciated!

i still cant understand your problem, read (5 times) go for read another 5 times — Álvaro Touzón
– Álvaro Touzón, Commented Oct 17, 2017 at 10:12
Is it just a bad example or do you really have data as a parameter, data as a variable and Data? — Daniel Hilgarth
– Daniel Hilgarth, Commented Oct 17, 2017 at 10:12
not sure, may be you want to append the data in the existing file , open the file in append mode, refer stackoverflow.com/questions/33418777/… — LogicBlower
– LogicBlower, Commented Oct 17, 2017 at 10:17
I'm just asking for a way to write a json file without getting the whole file deleted that's all basically — Sylent
– Sylent, Commented Oct 17, 2017 at 10:52

Karvannan Thi · Accepted Answer · 2017-10-17 10:55:30Z

1

you have to again read your file, parse the JSON, append your new result to the array, transform it back into a string and save it again.

var fs = require('fs')

fs.readFile('participants.json', function (err, data) {
    var json = JSON.parse(data);
    json.name = ["name1", "name2", "name3"];
    fs.writeFile("results.json", JSON.stringify(json))
})

answered Oct 17, 2017 at 10:55

Karvannan Thi

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2 Comments

Sylent Over a year ago

Thanks bro this worked for me! now i'll figure out how to get an name from an input field in there! Thanks you so much!

Sylent Over a year ago

Can you help me to get values into the array? I get the values from an input field. Sorry im new to JS :)

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