Solution to get published JSON objects in Python Flask App

A simple web application was developed on Python framework Flask, trying to get a JSON response from a POST AJAX request. Here is the code for AJAX calls:

var hotel=$( "#listHotel option:selected" ).val();
$.ajax({
    url: "/getHotels",
    contentType: "application/xml; charset=utf-8",
    data: ({'hotel':hotel}),
    type: "POST",
    success: function(response){
        var r= (response);
        var rating =
        alert(rating);
        $("#rate").html("Ratings : "+rating);
        $("#rate").show('slow');
        (response);
    },
    error: function(error){
        alert(response);
        (error);
    }
});

In Python code, it looks like this:

def getHotels():
    try:
        _hotel = {"value": ['hotel']}
        print _hotel
        hotel= _hotel["value"]
        print hotel

But not obtainedJSONObject，Request help to obtainJSONObject/value。

Solution

In order to get published JSON objects in a Python Flask application, you can follow these steps:

• Use the request.get_json() method to get the JSON data in the request body.
• Load JSON data into a dictionary.
• Access key-value pairs of JSON data from a dictionary.

The following sample code demonstrates how to get a published JSON object and get data from it:

from flask import Flask, request

app = Flask(__name__)

@('/get_json', methods=['POST'])
def get_json():
    json_data = request.get_json()  # Get JSON data in the request body    data = (json_data)  # Load JSON data into a dictionary
    # Access key-value pairs of JSON data from dictionary    hotel = data['hotel']
    rating = data['rating']

    # Return response    return {'hotel': hotel, 'rating': rating}

if __name__ == '__main__':
    ()

In the above code,request.get_json()Method is used to obtain JSON data in the request body and store the result injson_datain variable. Then, use()Method loads JSON data into a dictionary and stores it indatain variable. Finally, fromdataKey-value pairs to access JSON data in the dictionary.

1. Make sure you have it installed in the Flask applicationflask-restfullibrary.
2. Import in Flask applicationflask_restfullibrary.
3. Create an API resource class to handle JSON requests.
4. Define a method to handle POST requests in the API resource class.
5. In the method of processing POST requests, userequest.get_json()Methods to obtain JSON data in the request body.
6. Load JSON data into a dictionary.
7. Access key-value pairs of JSON data from a dictionary.

The following sample code demonstrates how to use itflask-restfulThe library gets the published JSON object and gets the data from it:

from flask import Flask
from flask_restful import Resource, Api

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

class Hotel(Resource):
    def post(self):
        json_data = request.get_json()  # Get JSON data in the request body        data = (json_data)  # Load JSON data into a dictionary
        # Access key-value pairs of JSON data from dictionary        hotel = data['hotel']
        rating = data['rating']

        # Return response        return {'hotel': hotel, 'rating': rating}

api.add_resource(Hotel, '/hotel')

if __name__ == '__main__':
    ()

In the above code, the flask-restful library is first imported. Then, an API resource class Hotel is created in the Flask application and a method that handles POST requests is defined. In the post() method, the request.get_json() method is used to obtain the JSON data in the request body and store the result in the json_data variable. Then, use the() method to load the JSON data into a dictionary and store it in a data variable. Finally, access the key-value pairs of JSON data from the data dictionary.

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