Python Flask-Restful POST not taking JSON arguments

Question

I am very new to Flask (& Flask-Restful).

My problem : json arguments for a POST is getting set to NONE (not working).

I am able to take arguments from the form-data, using POSTMAN plugin for chrome. But, when i switch to raw (& feed a json), it fails to read the json & assigns a NONE to all my arguments.

I have read some related stackoverflow posts related to this : link1, link2, link3 ... none of these helped me.

I am using python-2.6, Flask-Restful-0.3.3, Flask-0.10.1, Chrome, POSTMAN on Oracle Linux 6.5.

Python code app.py :

from flask import Flask, jsonify
from flask_restful import reqparse, abort, Api, Resource

app = Flask(__name__)
api = Api(app)

parser = reqparse.RequestParser()
parser.add_argument('username', type=str)
parser.add_argument('password', type=str)

class HelloWorld(Resource):
    def post(self):
        args = parser.parse_args()
        un = str(args['username'])
        pw = str(args['password'])
        return jsonify(u=un, p=pw)

api.add_resource(HelloWorld, '/testing')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5444 ,debug=True)

Testing this using POSTMAN :

• Using form-data : works perfectly !
• Using raw -> json : causes this issue

Things tried #1 :

Add json parameter to my add_argument() method in app.py

parser = reqparse.RequestParser()
parser.add_argument('username', type=str, location='json') # added json
parser.add_argument('password', type=str, location='json') # added json

Input : { "username": "hello", "password": "world" }

Output : { "p": "None", "u": "None" }

Things tried #2 :

Change type to unicode in add_argument() method in app.py

parser = reqparse.RequestParser()
parser.add_argument('username', type=unicode, location='json') # change type to unicode
parser.add_argument('password', type=unicode, location='json') # change type to unicode

Input : { "username": "hello", "password": "world" }

Output : { "p": "None", "u": "None" }

---

PS : I will keep updating my question, with every failed attempt. Please let me know if you need any more info to make this question more clear.

Answer 1

junnytony's answer gave me a hint, and I went ahead with this approach. get_json seems to have done the trick.

from flask import Flask, jsonify, request
from flask_restful import reqparse, abort, Api, Resource

app = Flask(__name__)
api = Api(app)

#parser = reqparse.RequestParser()
#parser.add_argument('username', type=unicode, location='json')
#parser.add_argument('password', type=unicode, location='json')

class HelloWorld(Resource):
    def post(self):
        json_data = request.get_json(force=True)
        un = json_data['username']
        pw = json_data['password']
        #args = parser.parse_args()
        #un = str(args['username'])
        #pw = str(args['password'])
        return jsonify(u=un, p=pw)

api.add_resource(HelloWorld, '/testing')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5444 ,debug=True)