JSON对象，但无法解析

Question

I need to do a lookup onto an itunes url which throws the json, in my nodejs based backend, i am using requests module of nodejs to get the json, and it indeed returns me the json as well, but the moment i try parsing it doesn't return me internal objects, however calls like stringify or JSON.parse just work without any exception. sample url https://itunes.apple.com/lookup?id=477091027

//sample url https://itunes.apple.com/lookup?id=477091027
 request(itunesUrl, function (error, response, body) {
                      if (!error && response.statusCode == 200) {         
                        var jsonbody = JSON.stringify(body.trim());                                                                        
                        var obj = JSON.parse(jsonbody);            
                        console.log(obj);                          
                        /*for(var myKey in obj) 
                        {
                           console.log("key:"+myKey+", value:"+obj[myKey]);
                       }*/

                        //none of these show value in them
                        appinfo.appname = obj.results[0].trackName;
                        appinfo.appImage = obj.results[0].artworkUrl60;
                        appinfo.appCategory = obj.results[0].genres[0];
                      }
                    });

I am at my wits end now

Answer 1

you just need to add the parameter json:true

request({url:itunesUrl, json:true}, function (error, response, body) {
                      if (!error && response.statusCode == 200) {
                       console.log(body.results[0].trackName)


                        }
                    });

Answer 2

Actually, you are stringify ing the json before parse -ing it again :

var jsonbody = JSON.stringify(body.trim());                                                                        
var obj = JSON.parse(jsonbody);

If body is supposed to contain json, then you directly should do

var obj = JSON.parse(body);

Answer 3

Even though Ninetainedo's answer looks correct, the docs suggest that you can use json: true as a parameter in the request options. This will automatically parse the json into a object, removing the need for the JSON.parse() line.

See https://github.com/request/request#requestoptions-callback