JavaScript Issue using JSON Object

Question

I'm pulling a JSON object via Meteor, and I'm retrieving it correctly

https://api.bitcoinaverage.com/ticker/USD

{
  "24h_avg": 147.77,
  "ask": 144.85,
  "bid": 144.33,
  "last": 144.81,
  "timestamp": "Thu, 17 Oct 2013 02:30:18 -0000",
  "total_vol": 79387.48
}

When I try to use the values, I get the following results

obj.ask
144.96
obj.24h_avg
SyntaxError: Unexpected token ILLEGAL
obj.total_vol
79773.46

Why am I getting an issue with the 24h_avg? I'm pretty darn lost here!

Thanks in advance!

Note: Even though you are getting the data as JSON, the problem itself has nothing to do with JSON. The problem is related to JavaScript syntax rules. — Felix Kling
– Felix Kling, Commented Oct 17, 2013 at 3:00
possible duplicate of Javascript: access an object property whose name starts with a number — Felix Kling
– Felix Kling, Commented Oct 17, 2013 at 3:04

PSL · Accepted Answer · 2013-10-17 02:55:29Z

1

You need to use [] notation on the object to access the values with the key having invalid characters for a key (Here they start with digits, same applies to other chars like - etc in the key).

So try

 obj["24h_avg"]


 obj.24h_avg // You are accessing a property it needs to be a valid identifier.

 obj["24h_avg"] // You are accessing a property value using ["property_name"] it need not  be a valid identifier.

edited Oct 17, 2013 at 2:55

answered Oct 17, 2013 at 2:48

PSL

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3 Comments

Varun Jain Over a year ago

Wow great! I thought that the square brackets were only to access array values and you have to use the "." for object values.

PSL Over a year ago

@VarunJain No, You can access object keys with the bracket notation, In fact Array is an object as well.

Felix Kling Over a year ago

@VarunJain: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

Arun P Johny · Accepted Answer · 2013-10-17 02:48:52Z

1

keys cannot start with digits, so need to use the bracket notation to access the member

so use

obj['24h_avg']

answered Oct 17, 2013 at 2:48

Arun P Johny

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