├── README.md
├── backend
    ├── .gitignore
    ├── README.md
    └── src
    │   └── app.py
├── frontend
    ├── .env
    ├── .gitignore
    ├── README.md
    ├── package-lock.json
    ├── package.json
    ├── public
    │   ├── favicon.ico
    │   ├── index.html
    │   ├── logo192.png
    │   ├── logo512.png
    │   ├── manifest.json
    │   └── robots.txt
    └── src
    │   ├── App.css
    │   ├── App.js
    │   ├── App.test.js
    │   ├── components
    │       ├── About.js
    │       ├── Navbar.js
    │       └── Users.js
    │   ├── index.css
    │   ├── index.js
    │   ├── logo.svg
    │   ├── serviceWorker.js
    │   └── setupTests.js
└── screenshot.png


/README.md:
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1 | # Python Flask & React Hooks with Mongodb
2 | 
3 | ![](./screenshot.png)


--------------------------------------------------------------------------------
/backend/.gitignore:
--------------------------------------------------------------------------------
1 | .vscode
2 | venv
3 | 


--------------------------------------------------------------------------------
/backend/README.md:
--------------------------------------------------------------------------------
1 | 
2 | flask flask-cors flask-pymongo


--------------------------------------------------------------------------------
/backend/src/app.py:
--------------------------------------------------------------------------------
 1 | from flask import Flask, jsonify, request
 2 | from flask_pymongo import PyMongo
 3 | from flask_cors import CORS
 4 | 
 5 | from bson import ObjectId
 6 | 
 7 | # Instantiation
 8 | app = Flask(__name__)
 9 | app.config['MONGO_URI'] = 'mongodb://localhost/pythonreact'
10 | mongo = PyMongo(app)
11 | 
12 | # Settings
13 | CORS(app)
14 | 
15 | # Database
16 | db = mongo.db.pythonreact
17 | 
18 | # Routes
19 | @app.route('/users', methods=['POST'])
20 | def createUser():
21 |   print(request.json)
22 |   id = db.insert({
23 |     'name': request.json['name'],
24 |     'email': request.json['email'],
25 |     'password': request.json['password']
26 |   })
27 |   return jsonify(str(ObjectId(id)))
28 | 
29 | 
30 | @app.route('/users', methods=['GET'])
31 | def getUsers():
32 |     users = []
33 |     for doc in db.find():
34 |         users.append({
35 |             '_id': str(ObjectId(doc['_id'])),
36 |             'name': doc['name'],
37 |             'email': doc['email'],
38 |             'password': doc['password']
39 |         })
40 |     return jsonify(users)
41 | 
42 | @app.route('/users/<id>', methods=['GET'])
43 | def getUser(id):
44 |   user = db.find_one({'_id': ObjectId(id)})
45 |   print(user)
46 |   return jsonify({
47 |       '_id': str(ObjectId(user['_id'])),
48 |       'name': user['name'],
49 |       'email': user['email'],
50 |       'password': user['password']
51 |   })
52 | 
53 | 
54 | @app.route('/users/<id>', methods=['DELETE'])
55 | def deleteUser(id):
56 |   db.delete_one({'_id': ObjectId(id)})
57 |   return jsonify({'message': 'User Deleted'})
58 | 
59 | @app.route('/users/<id>', methods=['PUT'])
60 | def updateUser(id):
61 |   print(request.json)
62 |   db.update_one({'_id': ObjectId(id)}, {"$set": {
63 |     'name': request.json['name'],
64 |     'email': request.json['email'],
65 |     'password': request.json['password']
66 |   }})
67 |   return jsonify({'message': 'User Updated'})
68 | 
69 | if __name__ == "__main__":
70 |     app.run(debug=True)
71 | 


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/frontend/.env:
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1 | REACT_APP_API=http://localhost:5000
2 | 


--------------------------------------------------------------------------------
/frontend/.gitignore:
--------------------------------------------------------------------------------
 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 2 | 
 3 | # dependencies
 4 | /node_modules
 5 | /.pnp
 6 | .pnp.js
 7 | 
 8 | # testing
 9 | /coverage
10 | 
11 | # production
12 | /build
13 | 
14 | # misc
15 | .DS_Store
16 | .env.local
17 | .env.development.local
18 | .env.test.local
19 | .env.production.local
20 | 
21 | npm-debug.log*
22 | yarn-debug.log*
23 | yarn-error.log*
24 | 


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/frontend/README.md:
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 1 | This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
 2 | 
 3 | ## Available Scripts
 4 | 
 5 | In the project directory, you can run:
 6 | 
 7 | ### `npm start`
 8 | 
 9 | Runs the app in the development mode.<br />
10 | Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
11 | 
12 | The page will reload if you make edits.<br />
13 | You will also see any lint errors in the console.
14 | 
15 | ### `npm test`
16 | 
17 | Launches the test runner in the interactive watch mode.<br />
18 | See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
19 | 
20 | ### `npm run build`
21 | 
22 | Builds the app for production to the `build` folder.<br />
23 | It correctly bundles React in production mode and optimizes the build for the best performance.
24 | 
25 | The build is minified and the filenames include the hashes.<br />
26 | Your app is ready to be deployed!
27 | 
28 | See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
29 | 
30 | ### `npm run eject`
31 | 
32 | **Note: this is a one-way operation. Once you `eject`, you can’t go back!**
33 | 
34 | If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
35 | 
36 | Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
37 | 
38 | You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
39 | 
40 | ## Learn More
41 | 
42 | You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
43 | 
44 | To learn React, check out the [React documentation](https://reactjs.org/).
45 | 
46 | ### Code Splitting
47 | 
48 | This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
49 | 
50 | ### Analyzing the Bundle Size
51 | 
52 | This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
53 | 
54 | ### Making a Progressive Web App
55 | 
56 | This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
57 | 
58 | ### Advanced Configuration
59 | 
60 | This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
61 | 
62 | ### Deployment
63 | 
64 | This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
65 | 
66 | ### `npm run build` fails to minify
67 | 
68 | This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify
69 | 


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/frontend/package.json:
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 1 | {
 2 |   "name": "frontend",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@testing-library/jest-dom": "^4.2.4",
 7 |     "@testing-library/react": "^9.5.0",
 8 |     "@testing-library/user-event": "^7.2.1",
 9 |     "bootswatch": "^4.4.1",
10 |     "react": "^16.13.1",
11 |     "react-dom": "^16.13.1",
12 |     "react-router-dom": "^5.1.2",
13 |     "react-scripts": "3.4.1"
14 |   },
15 |   "scripts": {
16 |     "start": "react-scripts start",
17 |     "build": "react-scripts build",
18 |     "test": "react-scripts test",
19 |     "eject": "react-scripts eject"
20 |   },
21 |   "eslintConfig": {
22 |     "extends": "react-app"
23 |   },
24 |   "browserslist": {
25 |     "production": [
26 |       ">0.2%",
27 |       "not dead",
28 |       "not op_mini all"
29 |     ],
30 |     "development": [
31 |       "last 1 chrome version",
32 |       "last 1 firefox version",
33 |       "last 1 safari version"
34 |     ]
35 |   }
36 | }
37 | 


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/frontend/public/favicon.ico:
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https://raw.githubusercontent.com/FaztWeb/flask-react-mongodb-crud/3c7fa154b4274d5de6ad046695dfbe7169f2c938/frontend/public/favicon.ico


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/frontend/public/index.html:
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 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 7 |     <meta name="theme-color" content="#000000" />
 8 |     <meta
 9 |       name="description"
10 |       content="Web site created using create-react-app"
11 |     />
12 |     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
13 |     <!--
14 |       manifest.json provides metadata used when your web app is installed on a
15 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
16 |     -->
17 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
18 |     <!--
19 |       Notice the use of %PUBLIC_URL% in the tags above.
20 |       It will be replaced with the URL of the `public` folder during the build.
21 |       Only files inside the `public` folder can be referenced from the HTML.
22 | 
23 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
24 |       work correctly both with client-side routing and a non-root public URL.
25 |       Learn how to configure a non-root public URL by running `npm run build`.
26 |     -->
27 |     <title>React App</title>
28 |   </head>
29 |   <body>
30 |     <noscript>You need to enable JavaScript to run this app.</noscript>
31 |     <div id="root"></div>
32 |     <!--
33 |       This HTML file is a template.
34 |       If you open it directly in the browser, you will see an empty page.
35 | 
36 |       You can add webfonts, meta tags, or analytics to this file.
37 |       The build step will place the bundled scripts into the <body> tag.
38 | 
39 |       To begin the development, run `npm start` or `yarn start`.
40 |       To create a production bundle, use `npm run build` or `yarn build`.
41 |     -->
42 |   </body>
43 | </html>
44 | 


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/frontend/public/logo192.png:
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https://raw.githubusercontent.com/FaztWeb/flask-react-mongodb-crud/3c7fa154b4274d5de6ad046695dfbe7169f2c938/frontend/public/logo192.png


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/frontend/public/logo512.png:
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https://raw.githubusercontent.com/FaztWeb/flask-react-mongodb-crud/3c7fa154b4274d5de6ad046695dfbe7169f2c938/frontend/public/logo512.png


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/frontend/public/manifest.json:
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 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     },
10 |     {
11 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


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/frontend/public/robots.txt:
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1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | Disallow:
4 | 


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/frontend/src/App.css:
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 1 | .App {
 2 |   text-align: center;
 3 | }
 4 | 
 5 | .App-logo {
 6 |   height: 40vmin;
 7 |   pointer-events: none;
 8 | }
 9 | 
10 | @media (prefers-reduced-motion: no-preference) {
11 |   .App-logo {
12 |     animation: App-logo-spin infinite 20s linear;
13 |   }
14 | }
15 | 
16 | .App-header {
17 |   background-color: #282c34;
18 |   min-height: 100vh;
19 |   display: flex;
20 |   flex-direction: column;
21 |   align-items: center;
22 |   justify-content: center;
23 |   font-size: calc(10px + 2vmin);
24 |   color: white;
25 | }
26 | 
27 | .App-link {
28 |   color: #61dafb;
29 | }
30 | 
31 | @keyframes App-logo-spin {
32 |   from {
33 |     transform: rotate(0deg);
34 |   }
35 |   to {
36 |     transform: rotate(360deg);
37 |   }
38 | }
39 | 


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/frontend/src/App.js:
--------------------------------------------------------------------------------
 1 | import React from "react";
 2 | import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
 3 | 
 4 | import { Navbar } from "./components/Navbar";
 5 | import { About } from "./components/About";
 6 | import { Users } from "./components/Users";
 7 | 
 8 | function App() {
 9 |   return (
10 |     <Router>
11 |       <Navbar />
12 | 
13 |       <div className="container p-4">
14 |         <Switch>
15 |           <Route path="/about" component={About} />
16 |           <Route path="/" component={Users} />
17 |         </Switch>
18 |       </div>
19 |     </Router>
20 |   );
21 | }
22 | 
23 | export default App;
24 | 


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/frontend/src/App.test.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { render } from '@testing-library/react';
 3 | import App from './App';
 4 | 
 5 | test('renders learn react link', () => {
 6 |   const { getByText } = render(<App />);
 7 |   const linkElement = getByText(/learn react/i);
 8 |   expect(linkElement).toBeInTheDocument();
 9 | });
10 | 


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/frontend/src/components/About.js:
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 1 | import React, { Fragment } from "react";
 2 | 
 3 | export const About = () => (
 4 |   <Fragment>
 5 |     <div className="row">
 6 |       <h3>About</h3>
 7 |       <p>
 8 |         Lorem ipsum dolor sit amet consectetur adipisicing elit. Debitis
 9 |         consequuntur, animi modi aperiam eos doloribus error temporibus ducimus,
10 |         odio aut cum numquam dolore minus tempora quibusdam hic provident beatae
11 |         totam dignissimos placeat tenetur nisi minima voluptatum! Quae
12 |         voluptatum qui deleniti incidunt fuga, delectus eius quam soluta ipsa
13 |         dolorem alias inventore, ad dolor mollitia eum fugit, rem ex! Aperiam
14 |         excepturi, quo consectetur sapiente possimus vero nisi perferendis
15 |         dolore voluptate doloribus quidem distinctio sint, architecto provident
16 |         repellendus quod odio animi. Magnam eius, eligendi, veritatis dolor,
17 |         incidunt culpa harum tenetur suscipit tempora sequi non ab. Mollitia
18 |         fugiat expedita molestiae quae. Repellendus ad ab fugiat deleniti
19 |         aspernatur, facilis necessitatibus officiis, hic expedita saepe quae
20 |         distinctio eligendi fugit at, cumque illo molestias suscipit!
21 |         Reiciendis, nihil eaque quis pariatur repellendus, illum consequatur,
22 |         unde cumque vero natus ipsum! Distinctio nesciunt possimus quibusdam
23 |         amet quaerat sapiente eius cumque fuga doloremque illo quos odit
24 |         tempora, vero est omnis esse.
25 |       </p>
26 |     </div>
27 |   </Fragment>
28 | );
29 | 


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/frontend/src/components/Navbar.js:
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 1 | import React from 'react'
 2 | import {Link} from 'react-router-dom'
 3 | 
 4 | export const Navbar = () => (
 5 |   <nav className="navbar navbar-expand-lg navbar-light bg-light">
 6 |         <Link className="navbar-brand" to="/">Flask & React</Link>
 7 |         <button className="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
 8 |           <span className="navbar-toggler-icon" />
 9 |         </button>
10 |         <div className="collapse navbar-collapse" id="navbarNav">
11 |           <ul className="navbar-nav">
12 |             <li className="nav-item">
13 |               <Link className="nav-link" to="/about">About</Link>
14 |             </li>
15 |           </ul>
16 |         </div>
17 |       </nav>
18 | )


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/frontend/src/components/Users.js:
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  1 | import React, { useState, useEffect, useRef } from "react";
  2 | 
  3 | const API = process.env.REACT_APP_API;
  4 | 
  5 | export const Users = () => {
  6 |   const [name, setName] = useState("");
  7 |   const [email, setEmail] = useState("");
  8 |   const [password, setPassword] = useState("");
  9 | 
 10 |   const [editing, setEditing] = useState(false);
 11 |   const [id, setId] = useState("");
 12 | 
 13 |   const nameInput = useRef(null);
 14 | 
 15 |   let [users, setUsers] = useState([]);
 16 | 
 17 |   const handleSubmit = async (e) => {
 18 |     e.preventDefault();
 19 |     if (!editing) {
 20 |       const res = await fetch(`${API}/users`, {
 21 |         method: "POST",
 22 |         headers: {
 23 |           "Content-Type": "application/json",
 24 |         },
 25 |         body: JSON.stringify({
 26 |           name,
 27 |           email,
 28 |           password,
 29 |         }),
 30 |       });
 31 |       await res.json();
 32 |     } else {
 33 |       const res = await fetch(`${API}/users/${id}`, {
 34 |         method: "PUT",
 35 |         headers: {
 36 |           "Content-Type": "application/json",
 37 |         },
 38 |         body: JSON.stringify({
 39 |           name,
 40 |           email,
 41 |           password,
 42 |         }),
 43 |       });
 44 |       const data = await res.json();
 45 |       console.log(data);
 46 |       setEditing(false);
 47 |       setId("");
 48 |     }
 49 |     await getUsers();
 50 | 
 51 |     setName("");
 52 |     setEmail("");
 53 |     setPassword("");
 54 |     nameInput.current.focus();
 55 |   };
 56 | 
 57 |   const getUsers = async () => {
 58 |     const res = await fetch(`${API}/users`);
 59 |     const data = await res.json();
 60 |     setUsers(data);
 61 |   };
 62 | 
 63 |   const deleteUser = async (id) => {
 64 |     const userResponse = window.confirm("Are you sure you want to delete it?");
 65 |     if (userResponse) {
 66 |       const res = await fetch(`${API}/users/${id}`, {
 67 |         method: "DELETE",
 68 |       });
 69 |       const data = await res.json();
 70 |       console.log(data);
 71 |       await getUsers();
 72 |     }
 73 |   };
 74 | 
 75 |   const editUser = async (id) => {
 76 |     const res = await fetch(`${API}/users/${id}`);
 77 |     const data = await res.json();
 78 | 
 79 |     setEditing(true);
 80 |     setId(id);
 81 | 
 82 |     // Reset
 83 |     setName(data.name);
 84 |     setEmail(data.email);
 85 |     setPassword(data.password);
 86 |     nameInput.current.focus();
 87 |   };
 88 | 
 89 |   useEffect(() => {
 90 |     getUsers();
 91 |   }, []);
 92 | 
 93 |   return (
 94 |     <div className="row">
 95 |       <div className="col-md-4">
 96 |         <form onSubmit={handleSubmit} className="card card-body">
 97 |           <div className="form-group">
 98 |             <input
 99 |               type="text"
100 |               onChange={(e) => setName(e.target.value)}
101 |               value={name}
102 |               className="form-control"
103 |               placeholder="Name"
104 |               ref={nameInput}
105 |               autoFocus
106 |             />
107 |           </div>
108 |           <div className="form-group">
109 |             <input
110 |               type="email"
111 |               onChange={(e) => setEmail(e.target.value)}
112 |               value={email}
113 |               className="form-control"
114 |               placeholder="User's Email"
115 |             />
116 |           </div>
117 |           <div className="form-group">
118 |             <input
119 |               type="password"
120 |               onChange={(e) => setPassword(e.target.value)}
121 |               value={password}
122 |               className="form-control"
123 |               placeholder="User's Password"
124 |             />
125 |           </div>
126 |           <button className="btn btn-primary btn-block">
127 |             {editing ? "Update" : "Create"}
128 |           </button>
129 |         </form>
130 |       </div>
131 |       <div className="col-md-6">
132 |         <table className="table table-striped">
133 |           <thead>
134 |             <tr>
135 |               <th>Name</th>
136 |               <th>Email</th>
137 |               <th>Password</th>
138 |               <th>Operations</th>
139 |             </tr>
140 |           </thead>
141 |           <tbody>
142 |             {users.map((user) => (
143 |               <tr key={user._id}>
144 |                 <td>{user.name}</td>
145 |                 <td>{user.email}</td>
146 |                 <td>{user.password}</td>
147 |                 <td>
148 |                   <button
149 |                     className="btn btn-secondary btn-sm btn-block"
150 |                     onClick={(e) => editUser(user._id)}
151 |                   >
152 |                     Edit
153 |                   </button>
154 |                   <button
155 |                     className="btn btn-danger btn-sm btn-block"
156 |                     onClick={(e) => deleteUser(user._id)}
157 |                   >
158 |                     Delete
159 |                   </button>
160 |                 </td>
161 |               </tr>
162 |             ))}
163 |           </tbody>
164 |         </table>
165 |       </div>
166 |     </div>
167 |   );
168 | };
169 | 


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/frontend/src/index.css:
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 1 | body {
 2 |   margin: 0;
 3 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 4 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 5 |     sans-serif;
 6 |   -webkit-font-smoothing: antialiased;
 7 |   -moz-osx-font-smoothing: grayscale;
 8 | }
 9 | 
10 | code {
11 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
12 |     monospace;
13 | }
14 | 


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/frontend/src/index.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import './index.css';
 4 | import App from './App';
 5 | import * as serviceWorker from './serviceWorker';
 6 | 
 7 | import 'bootswatch/dist/lux/bootstrap.min.css'
 8 | 
 9 | ReactDOM.render(
10 |   <React.StrictMode>
11 |     <App />
12 |   </React.StrictMode>,
13 |   document.getElementById('root')
14 | );
15 | 
16 | // If you want your app to work offline and load faster, you can change
17 | // unregister() to register() below. Note this comes with some pitfalls.
18 | // Learn more about service workers: https://bit.ly/CRA-PWA
19 | serviceWorker.unregister();
20 | 


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/frontend/src/logo.svg:
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1 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
2 |     <g fill="#61DAFB">
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5 |         <path d="M520.5 78.1z"/>
6 |     </g>
7 | </svg>
8 | 


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/frontend/src/serviceWorker.js:
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  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read https://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.0/8 are considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | export function register(config) {
 24 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 25 |     // The URL constructor is available in all browsers that support SW.
 26 |     const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
 27 |     if (publicUrl.origin !== window.location.origin) {
 28 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 29 |       // from what our page is served on. This might happen if a CDN is used to
 30 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 31 |       return;
 32 |     }
 33 | 
 34 |     window.addEventListener('load', () => {
 35 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 36 | 
 37 |       if (isLocalhost) {
 38 |         // This is running on localhost. Let's check if a service worker still exists or not.
 39 |         checkValidServiceWorker(swUrl, config);
 40 | 
 41 |         // Add some additional logging to localhost, pointing developers to the
 42 |         // service worker/PWA documentation.
 43 |         navigator.serviceWorker.ready.then(() => {
 44 |           console.log(
 45 |             'This web app is being served cache-first by a service ' +
 46 |               'worker. To learn more, visit https://bit.ly/CRA-PWA'
 47 |           );
 48 |         });
 49 |       } else {
 50 |         // Is not localhost. Just register service worker
 51 |         registerValidSW(swUrl, config);
 52 |       }
 53 |     });
 54 |   }
 55 | }
 56 | 
 57 | function registerValidSW(swUrl, config) {
 58 |   navigator.serviceWorker
 59 |     .register(swUrl)
 60 |     .then(registration => {
 61 |       registration.onupdatefound = () => {
 62 |         const installingWorker = registration.installing;
 63 |         if (installingWorker == null) {
 64 |           return;
 65 |         }
 66 |         installingWorker.onstatechange = () => {
 67 |           if (installingWorker.state === 'installed') {
 68 |             if (navigator.serviceWorker.controller) {
 69 |               // At this point, the updated precached content has been fetched,
 70 |               // but the previous service worker will still serve the older
 71 |               // content until all client tabs are closed.
 72 |               console.log(
 73 |                 'New content is available and will be used when all ' +
 74 |                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
 75 |               );
 76 | 
 77 |               // Execute callback
 78 |               if (config && config.onUpdate) {
 79 |                 config.onUpdate(registration);
 80 |               }
 81 |             } else {
 82 |               // At this point, everything has been precached.
 83 |               // It's the perfect time to display a
 84 |               // "Content is cached for offline use." message.
 85 |               console.log('Content is cached for offline use.');
 86 | 
 87 |               // Execute callback
 88 |               if (config && config.onSuccess) {
 89 |                 config.onSuccess(registration);
 90 |               }
 91 |             }
 92 |           }
 93 |         };
 94 |       };
 95 |     })
 96 |     .catch(error => {
 97 |       console.error('Error during service worker registration:', error);
 98 |     });
 99 | }
100 | 
101 | function checkValidServiceWorker(swUrl, config) {
102 |   // Check if the service worker can be found. If it can't reload the page.
103 |   fetch(swUrl, {
104 |     headers: { 'Service-Worker': 'script' },
105 |   })
106 |     .then(response => {
107 |       // Ensure service worker exists, and that we really are getting a JS file.
108 |       const contentType = response.headers.get('content-type');
109 |       if (
110 |         response.status === 404 ||
111 |         (contentType != null && contentType.indexOf('javascript') === -1)
112 |       ) {
113 |         // No service worker found. Probably a different app. Reload the page.
114 |         navigator.serviceWorker.ready.then(registration => {
115 |           registration.unregister().then(() => {
116 |             window.location.reload();
117 |           });
118 |         });
119 |       } else {
120 |         // Service worker found. Proceed as normal.
121 |         registerValidSW(swUrl, config);
122 |       }
123 |     })
124 |     .catch(() => {
125 |       console.log(
126 |         'No internet connection found. App is running in offline mode.'
127 |       );
128 |     });
129 | }
130 | 
131 | export function unregister() {
132 |   if ('serviceWorker' in navigator) {
133 |     navigator.serviceWorker.ready
134 |       .then(registration => {
135 |         registration.unregister();
136 |       })
137 |       .catch(error => {
138 |         console.error(error.message);
139 |       });
140 |   }
141 | }
142 | 


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/frontend/src/setupTests.js:
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1 | // jest-dom adds custom jest matchers for asserting on DOM nodes.
2 | // allows you to do things like:
3 | // expect(element).toHaveTextContent(/react/i)
4 | // learn more: https://github.com/testing-library/jest-dom
5 | import '@testing-library/jest-dom/extend-expect';
6 | 


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/screenshot.png:
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https://raw.githubusercontent.com/FaztWeb/flask-react-mongodb-crud/3c7fa154b4274d5de6ad046695dfbe7169f2c938/screenshot.png


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