Python nested json object being serialize as str

Question

Hi I have made a custom JSONEncoder and happened to run into this issue. When I use the dumps function of simplejson the nested object gets serialize as a string. For example I use this:

simplejson.dumps({'lat': obj.lat, 'lon': obj.lon})

And get this:

{
website: "http://something.org",
location: "{"lat": 12.140158037163658, "lon": -86.24754807669069}"
}

If you see location object is with double quotes is there a way I can specify location object to be dump properly as a JSON object (without the double quotes).

Edit

class jsonEncoder(simplejson.JSONEncoder):
    def default(self, obj):
        isinstance(obj, db.GeoPt):
            return simplejson.dumps({'lat': obj.lat, 'lon': obj.lon})

        else:
            return simplejson.JSONEncoder.default(self, obj)

The quotes are not optional in JSON (unlike JavaScript object literals). You have to add quotes for your example to be proper JSON. — user395760
– user395760, Commented Sep 2, 2012 at 2:16
Looks like that the problem resides in your JSONEncoder implementation. You may want to add your implementation here to get better help. — behnam
– behnam, Commented Sep 2, 2012 at 3:31
@Necronet : alternatively you could pass dict with lat, lon argument to JsonEncoder . — igauravsehrawat
– igauravsehrawat, Commented Oct 13, 2014 at 7:47

Warren Weckesser · Accepted Answer · 2012-09-02 07:18:13Z

4

Don't return a string from default() when obj is a db.GeoPt. Instead, return the dict with keys 'lat' and 'lon', and let the JSON library serialize the dict.

Try this:

class jsonEncoder(simplejson.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, db.GeoPt):
            return {'lat': obj.lat, 'lon': obj.lon}
        else:
            return simplejson.JSONEncoder.default(self, obj)

answered Sep 2, 2012 at 7:18

Warren Weckesser

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