Question

20

Convert JSON to Javascript Array Object - node.js

rated 0 times [ 25] [ 5] / answers: 1 / hits: 33096 / 9 Years ago, fri, june 12, 2015, 12:00:00

I don't know any Javascript. I have a .json file that looks like this:

{ results: [

{

    challenger: {

        __type: Pointer,

        className: Player,

        objectId: STWAxAHKay

    },

    challengerScore: 18,

    createdAt: 2014-12-05T21:43:01.099Z,

    defender: {

        __type: Pointer,

        className: Player,

        objectId: UGAmRVd7Tr

    },

    defenderScore: 21,

    objectId: pmiACGwe45,

    updatedAt: 2014-12-05T21:43:01.099Z

},

{

    challenger: {

        __type: Pointer,

        className: Player,

        objectId: STWAxAHKay

    },

    challengerScore: 23,

    createdAt: 2014-12-05T21:43:01.969Z,

    defender: {

        __type: Pointer,

        className: Player,

        objectId: UGAmRVd7Tr

    },

    defenderScore: 25,

    objectId: HqptXdYmQL,

    updatedAt: 2014-12-05T21:43:01.969Z

}

]}

I'm reading it into my script like this:

var fs = require('fs');

var results = JSON.parse(fs.readFileSync('Game.json', 'utf8'));

results is an object but it's not an array.

I would like to make it an array so I can iterate through each game, grab the data I need from each game and use it to create a new object that I ultimately save in a .json file.

I would love for someone to guide me through this entire process but I would be thrilled if someone can just show me how to make an array of games that I can iterate through just to get me started.

Thank you.

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answered 9 Years ago keyanah · Accepted Answer

You can try Javascript's inbuilt functions like this:

var fs = require('fs');

var results = JSON.parse(fs.readFileSync('games.json', 'utf8'));



function grabDataFromAGame(elem, index, array) {

    // Grab the data from the game object you need

    var gameObj = {};

    gameObj.challengerScore = elem.challengerScore;

    gameObj.defenderScore = elem.defenderScore;

    gameObj.id = elem.objectId;

    saveGameObjToFile(gameObj);

}



function saveGameObjToFile(gameObj){

    var gameFile = fs.openSync('./gameObj-' + gameObj.id + '.json', 'w');

    fs.writeSync(gameFile, JSON.stringify(gameObj));

}

results.results.forEach(grabDataFromAGame);

This code generated the following files:

~/salesman 542-> node so.js 

~/salesman 543-> 

~/salesman 543-> 

~/salesman 543-> ll gameObj-*

-rw-r--r--  1 neerajsharma  staff    59B Jun 11 18:56 gameObj-pmiACGwe45.json

-rw-r--r--  1 neerajsharma  staff    59B Jun 11 18:56 gameObj-HqptXdYmQL.json

~/salesman 544-> cat gameObj-pmiACGwe45.json | python -m json.tool

{

    challengerScore: 18,

    defenderScore: 21,

    id: pmiACGwe45

}

~/salesman 545->

Note that it is not recommended to use sync calls with Node, because node is single-threaded and your application is blocked till the sync calls are complete.

An example of using forEach can be found here