Right now I am currently just doing this:
self.response.headers['Content-Type'] = 'application/json'
self.response.out.write('{"success": "some var", "payload": "some var"}')
Is there a better way to do it using some library?
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stackoverflow.com/questions/1171584/…Markus von Broady– Markus von Broady2012-09-30 22:23:31 +00:00Commented Sep 30, 2012 at 22:23
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5 Answers
Yes, you should use the json library that is supported in Python 2.7:
import json
self.response.headers['Content-Type'] = 'application/json'
obj = {
'success': 'some var',
'payload': 'some var',
}
self.response.out.write(json.dumps(obj))
1 Comment
Jonny
Doh! I was using
self.response.headers['Content-Type:'] = 'application/json' all the time and pulled my strin.. hairs. Accidentally added a colon there.webapp2 has a handy wrapper for the json module: it will use simplejson if available, or the json module from Python >= 2.6 if available, and as a last resource the django.utils.simplejson module on App Engine.
http://webapp2.readthedocs.io/en/latest/api/webapp2_extras/json.html
from webapp2_extras import json
self.response.content_type = 'application/json'
obj = {
'success': 'some var',
'payload': 'some var',
}
self.response.write(json.encode(obj))
Comments
python itself has a json module, which will make sure that your JSON is properly formatted, handwritten JSON is more prone to get errors.
import json
self.response.headers['Content-Type'] = 'application/json'
json.dump({"success":somevar,"payload":someothervar},self.response.out)
2 Comments
aschmid00
i might be wrong but i doubt this actually works this way. why would you pass
self.response.out to the dump function as an argument?
Guido van Rossum
It does work that way. self.response.out is a stream and dump() takes a stream as its second argument. (Maybe you're confused by the difference between dump() and dumps()?)
I usually using like this:
class JsonEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, datetime):
return obj.isoformat()
elif isinstance(obj, ndb.Key):
return obj.urlsafe()
return json.JSONEncoder.default(self, obj)
class BaseRequestHandler(webapp2.RequestHandler):
def json_response(self, data, status=200):
self.response.headers['Content-Type'] = 'application/json'
self.response.status_int = status
self.response.write(json.dumps(data, cls=JsonEncoder))
class APIHandler(BaseRequestHandler):
def get_product(self):
product = Product.get(id=1)
if product:
jpro = product.to_dict()
self.json_response(jpro)
else:
self.json_response({'msg': 'product not found'}, status=404)
Comments
import json
import webapp2
def jsonify(**kwargs):
response = webapp2.Response(content_type="application/json")
json.dump(kwargs, response.out)
return response
Every place you want to return a json response...
return jsonify(arg1='val1', arg2='val2')
or
return jsonify({ 'arg1': 'val1', 'arg2': 'val2' })
