Question

32

Parsing JSON data from a URL

rated 0 times [ 33] [ 1] / answers: 1 / hits: 61941 / 11 Years ago, fri, october 18, 2013, 12:00:00

I'm trying to create function that can parse JSON from a url. Here's what I have so far:

function get_json(url) {

    http.get(url, function(res) {

        var body = '';

        res.on('data', function(chunk) {

            body += chunk;

        });



        res.on('end', function() {

            var response = JSON.parse(body);

                return response;

        });

    });

}



var mydata = get_json(...)

When I call this function I get errors. How can I return parsed JSON from this function?

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mckinleyi

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2 Years ago

answered 11 Years ago hallie · Accepted Answer

Your return response; won't be of any use. You can pass a function as an argument to get_json, and have it receive the result. Then in place of return response;, invoke the function. So if the parameter is named callback, you'd do callback(response);.

// ----receive function----v

function get_json(url, callback) {

    http.get(url, function(res) {

        var body = '';

        res.on('data', function(chunk) {

            body += chunk;

        });



        res.on('end', function() {

            var response = JSON.parse(body);

// call function ----v

            callback(response);

        });

    });

}



         // -----------the url---v         ------------the callback---v

var mydata = get_json(http://webapp.armadealo.com/home.json, function (resp) {

    console.log(resp);

});

Passing functions around as callbacks is essential to understand when using NodeJS.