How to connect mongodb with python flask and perform save/get operations

from flask import Flask, render_template, request, jsonify, redirect, url_for
from pymongo import MongoClient
from bson.json_util import dumps

client = MongoClient('mongodb://1.2.3.4:27017/')
ngdev = client.posts //posts is db here/

@app.route('/save', methods=['POST'])
def save():
        request_data = request.get_json()
        try:
                client.ngdev.program.insert_one(request_data)
        except err:
                return "Mongodb insertion failed"
        return "success"


@app.route('/posts', methods=['GET'])
def getPosts():
        programs = dumps(client.ngdev.posts.find({},{"tags":0,"_id":0,"image":0}))        
        return  programs

if __name__ == '__main__':
        app.run(host='0.0.0.0',port=4999)