Issue encountered during retrieval of data from Steam marketplace

My goal is to retrieve the item price information for a single item on the steam market through a GET request.

Below is the angularJS script I am currently using:

<script>
var app = angular.module('csgo', []);
app.controller('MainCtrl', function($scope, $http) {
    $http.jsonp("http://steamcommunity.com/market/priceoverview/?currency=3&appid=730&market_hash_name=StatTrak%E2%84%A2%20P250%20%7C%20Steel%20Disruption%20%28Factory%20New%29").success(function(response) { 
        $scope.values = response;
        console.log(response); 
    });
});
</script>

However, upon testing this in my browser, I encountered the following error:

Uncaught SyntaxError: Unexpected token : ?currency=3&appid=730&market_hash_name=StatTrak™ P250 | Steel Disruption (Factory New):1

Upon clicking the link provided in the error message (?currency=3&appid=730&market_hash_name=StatTrak™ P250 | Steel Disruption (Factory New):1), I was directed to a line displaying:

{"success":true,"lowest_price":"1,09&#8364; ","volume":"348","median_price":"1,01&#8364; "}

Even though I did receive the information, it was accompanied by an error highlighting the JSON response in red. If anyone has insights into this issue, please share.

I am utilizing nodejs, express, and angular for this process.

UPDATE:

In an attempt to troubleshoot, I tested a different URL: https://angularjs.org/greet.php?callback=JSON_CALLBACK&name=Super%20Hero

To my surprise, this alternate URL worked as expected. The original URL, however, continues to pose challenges. Any suggestions on how to resolve this?

angularjsnode.jsexpressgetjsonp

Answer №1

When utilizing JSONP, remember to invoke JSON_CALLBACK() in order to process the returned data. For further information, you can consult the Angular JSONP documentation, which also includes a live demonstration on using JSON_CALLBACK.

In your specific scenario, the call should resemble the following example:

$http.jsonp("http://steamcommunity.com/market/priceoverview/?callback=JSON_CALLBACK&currency=3&appid=730&market_hash_name=StatTrak%E2%84%A2%20P250%20%7C%20Steel%20Disruption%20%28Factory%20New%29").success(function(response) { 
    $scope.values = response;
    console.log(response); 
});

If your server correctly handles JSON_CALLBACK, any issues should be resolved.

Update

I recently examined the Steam Community

There is limited support for the JSONP protocol and sharing the API key goes against the platform's acceptable usage policy. Valve prohibits embedding this API key within JavaScript files that are fully downloaded by clients, as it violates their specified guidelines.

Given that they do not endorse JSONP or CORS, it appears that accessing the Steam API from Angular may present challenges.

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