CODEWITHSUNDEEP
javascriptarraysjsonapi
Ahmad Othman
Ahmad Othman

Reputation: 187

Can't get information from an array

I have this json file called gameupdater.json

gameupdater.json:

{ "730":{
    "success":true,
    "data":{
       "price_overview":{
          "currency":"EUR",
          "initial":1399,
          "final":937,
          "discount_percent":33
       }
    }
  }
}

And I have a javascript file that has the following code:

var updater = JSON.parse(fs.readFileSync('gameupdater.json'));
var jsonstring = JSON.stringify(updater, null, 4);

var num = updater.730.data.priceoverview.initial;

console.log(num);

Yet whenever I run it (node bot.js) in CMD. It does not give me what I am looking for, which is 1399.

It instead gives me this error:

var num = updater.730.data.priceoverview.initial;
             ^^^^

SyntaxError: Unexpected number

Oh, I'm pretty sure it would be hard to change stuff, since this array is going to be automatically downloaded from this website: http://store.steampowered.com/api/appdetails?appids=730

Upvotes: 0

Views: 72

Answers (2)

Carcigenicate
Carcigenicate

Reputation: 45736

You can't use a number with the dot syntax. You need to use the brace syntax, and access it as a string:

updater["730"].data...

Or, if the property is entirely a number, you can also use a bare number, but again, it must be inside the square braces:

updater[730].data...

Upvotes: 3

kukkuz
kukkuz

Reputation: 42352

You can't use dot operator to access properties of an object if it starts with a number - you must use the bracket notation[].

See the Dot Notation section in this MDN link - Property Accessors

In this code, property must be a valid JavaScript identifier, i.e. a sequence of alphanumerical characters, also including the underscore ("_") and dollar sign ("$"), that cannot start with a number

See demo below:

var updater = {
  "730": {
    "success": true,
    "data": {
      "price_overview": {
        "currency": "EUR",
        "initial": 1399,
        "final": 937,
        "discount_percent": 33
      }
    }
  }
};

var jsonstring = JSON.stringify(updater, null, 4);

var num = updater['730'].data.price_overview.initial;

console.log(num);

Upvotes: 2

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