Get Data JSON in Flask

Even with the "working" code, in case of your if-block failure (when value1 and value2 is None) will cause the same error, since you are not handling the else part of the if-block. The corrected should be:

@app.route('/api/v1/list', methods=['POST'])def add_entry():    print("p0")    request_json     = request.get_json()    value1           = request_json.get('First_Name')    value2           = request_json.get('Last_Name')    response_content = None    if value1 is not None and value2 is not None:        print("p3")        cursor.execute("INSERT INTO person (first_name,last_name) VALUES (%s,%s)", (value1, value2))        response_content = conn.commit()    return jsonify(response_content)

Of course you may want something better than None as the response.

Your add_entry function isn't returning a response. You must return something even if it's just return 'OK'.

EDIT: You're still not returning anything. In Flask the Python print statement is not the equivalent of PHP's echo. All print does is print to the console. You still have to return a value. If what you need is to return content and appname JSON encoded, then add

return json.loads({'contents': contents, 'appname': appname})

to the end of your function.

And to be clear in Flask views must return a value. That Python functions implicitly return None is inconsequential. The error that's occurring is that your function has no return statment.

Here a code working in my case :

@app.route('/api/v1/list', methods=['POST'])def add_entry():    print("p0")    request_json = request.get_json()    value1 = request_json.get('First_Name')    value2 = request_json.get('Last_Name')    if value1 is not None and value2 is not None:        print("p3")        cursor.execute("INSERT INTO person (first_name,last_name) VALUES (%s,%s)", (value1, value2))        data = conn.commit()        return jsonify(data)