Parse json on python server side

Question

My client code:

var http = new XMLHttpRequest();
    var url = "http://localhost:8000/recData";
    var params = JSON.stringify({json: screen_keywords});
    console.log(params);
    http.open("POST", url, true);

    //Send the proper header information along with the request
    http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

    http.onreadystatechange = function() {
    //Call a function when the state changes.
        if(http.readyState == 4 && http.status == 200) {
            alert(http.responseText);
        }   
    }
    http.send(params);

My server:

def do_POST(self):
        if self.path == "/recData":
          content_length = int(self.headers.getheader('content-length'))        
          body = self.rfile.read(content_length)
          result = json.dumps(body)
          pprint(result)

The result is:

'"{\\"json\\":[{\\"id\\":\\"1453-HCI-user-human-computer-interaction\\",\\"x_cordinate\\":395.9217224121094,\\"y_cordinate\\":729.04296875,\\"keyword\\":\\"user-human-computer-interaction\\",\\"radius\\":\\"70.359375\\",\\"obj_rel\\":false,\\"sub_rel\\":false},{\\"id\\":\\"4044-HCI-user-design\\",\\"x_cordinate\\":544.33837890625,\\"y_cordinate\\":773.467529296875,\\"keyword\\":\\"user-design\\",\\"radius\\":\\"50.359375\\",\\"obj_rel\\":false,\\"sub_rel\\":false},{\\"id\\":\\"668-HCI-user-experience\\",\\"x_cordinate\\":328.0223083496094,\\"y_cordinate\\":460.09271240234375,\\"keyword\\":\\"user-experience\\",\\"radius\\":\\"73.703125\\",\\"obj_rel\\":false,\\"sub_rel\\":false},{\\"id\\":\\"2714-HCI-user-enjoyment\\",\\"x_cordinate\\":562.9501342773438,\\"y_cordinate\\":268.96636962890625,\\"keyword\\":\\"user-enjoyment\\",\\"radius\\":\\"70.359375\\",\\"obj_rel\\":false,\\"sub_rel\\":false},{\\"id\\":\\"2659-ip-ip-TCP\\",\\"x_cordinate\\":648.444091796875,\\"y_cordinate\\":813.05712890625,\\"keyword\\":\\"ip-TCP\\",\\"radius\\":\\"41\\",\\"obj_rel\\":true,\\"sub_rel\\":false},{\\"id\\":\\"1022-service-ecosystem-trust\\",\\"x_cordinate\\":743.697509765625,\\"y_cordinate\\":848.6085205078125,\\"keyword\\":\\"trust\\",\\"radius\\":\\"38.3359375\\",\\"obj_rel\\":false,\\"sub_rel\\":false},{\\"id\\":\\"1916-ip-ip-management\\",\\"x_cordinate\\":750.01123046875,\\"y_cordinate\\":681.5203247070312,\\"keyword\\":\\"ip-management\\",\\"radius\\":\\"85.0390625\\",\\"obj_rel\\":true,\\"sub_rel\\":true},{\\"id\\":\\"1769-service-ecosystem-service-design\\",\\"x_cordinate\\":653.7368774414062,\\"y_cordinate\\":903.925537109375,\\"keyword\\":\\"service-design\\",\\"radius\\":\\"53.0078125\\",\\"obj_rel\\":false,\\"sub_rel\\":true},{\\"id\\":\\"4516-HCI-user-fun\\",\\"x_cordinate\\":562.857177734375,\\"y_cordinate\\":884.592529296875,\\"keyword\\":\\"user-fun\\",\\"radius\\":\\"41\\",\\"obj_rel\\":false,\\"sub_rel\\":true},{\\"id\\":\\"2291-HCI-user-usability\\",\\"x_cordinate\\":436.70556640625,\\"y_cordinate\\":878.2095947265625,\\"keyword\\":\\"user-usability\\",\\"radius\\":\\"58.3515625\\",\\"obj_rel\\":false,\\"sub_rel\\":true}]}"'

I am sending the json to my server side, but i am unable to decode it on my server side. Since i want to use it as a list so i can use a for loop on python side by accessing each object. Please tell me how to fix this. My result variable look something like this currently as shown in the snippet. Help will be highly appreciated.

What you have here '"{\\"json\\":[{...}"' is probably not what you want. You will need to remove the leading and trailing double-quotes from the Python string before feeding ti to json.loads() — nigel222
– nigel222, Commented May 19, 2016 at 11:47

Selcuk · Accepted Answer · 2016-05-19 11:43:17Z

1

You are trying to re-encode the JSON string. You need to use json.loads() instead:

result = json.loads(body)

answered May 19, 2016 at 11:43

Selcuk

60.1k12 gold badges114 silver badges119 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Hassan Abbas Over a year ago

If i use that i end with something like this u'json': [{u'id': u'3880-HCI-user-human-computer-interaction' in all the list

Selcuk Over a year ago

@HassanAbbas The returned result is a Python dictionary. You can find your expected list in result["json"]. Try printing it using pprint(result["json"])

Hassan Abbas Over a year ago

The problem is that i dont want 'u' to be coming in every element. If i do it your way result[json] i do get a list but character 'u' in every element.

Selcuk Over a year ago

@HassanAbbas The u denotes that it is a Unicode string. You can't get rid of it and it won't affect your use of the list. See this question for a detailed explanation.

Hassan Abbas Over a year ago

Thanks for the help. Now i have seen 'u' does not effect anything.

Collectives™ on Stack Overflow

Parse json on python server side

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related