code example for CSV Importer with Node

Co-authored-by: Arpendu Kumar Garai <Arpendu.KumarGarai@microfocus.com>

nodejs/node-csv-importer/client/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

nodejs/node-csv-importer/client/README.md

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+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+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.
+
+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.
+
+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.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

nodejs/node-csv-importer/client/package.json

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+{
+  "name": "client",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "^13.4.0",
+    "@testing-library/user-event": "^13.5.0",
+    "axios": "^1.1.3",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-scripts": "5.0.1",
+    "react-table": "^7.8.0",
+    "web-vitals": "^2.1.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

nodejs/node-csv-importer/client/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

nodejs/node-csv-importer/client/public/manifest.json

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+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

nodejs/node-csv-importer/client/public/robots.txt

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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

nodejs/node-csv-importer/client/src/App.css

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+table {
+  border-spacing: 0;
+  border: 1px solid #ededed;
+}
+table tr:last-child td {
+  border-bottom: 0;
+}
+table th,
+table td {
+  margin: 0;
+  padding: 0.5rem;
+  border-bottom: 1px solid #ededed;
+  border-right: 1px solid #ededed;
+  position: relative;
+}
+table th:last-child,
+table td:last-child {
+  border-right: 0;
+}
+table tr:nth-child(even) {
+  background-color: #fafafa;
+}
+
+table th::before {
+  position: absolute;
+  right: 15px;
+  top: 16px;
+  content: "";
+  width: 0;
+  height: 0;
+  border-left: 5px solid transparent;
+  border-right: 5px solid transparent;
+}
+table th.sort-asc::before {
+  border-bottom: 5px solid #22543d;
+}
+table th.sort-desc::before {
+  border-top: 5px solid #22543d;
+}
+
+.App {
+  display: flex;
+  flex-direction: column;
+  padding: 20px;
+}
+.badge {
+  background-color: #9ae6b4;
+  color: #22543d;
+  margin-right: 4px;
+  padding: 4px 8px;
+  border-radius: 12px;
+  font-size: 12px;
+  font-weight: bold;
+  text-transform: uppercase;
+}
+input {
+  padding: 10px;
+  margin-bottom: 20px;
+  font-size: 18px;
+  border-radius: 5px;
+  border: 1px solid #ddd;
+  box-shadow: none;
+}

nodejs/node-csv-importer/client/src/App.js

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+import React, { useMemo, useState, useEffect } from "react";
+import axios from "axios";
+import Table from "./Table";
+import './App.css';
+
+const Children = ({ values }) => {
+  return (
+    <>
+      {values.map((child, idx) => {
+        return (
+          <div className="image">
+            <img
+              src={child.avatar}
+              alt="Profile"
+            />
+            </div>
+        );
+      })}
+    </>
+  );
+};
+
+const Avatar = ({ value }) => {
+  return (
+    <div className="image">
+      <img
+        src={value}
+        alt="Profile"
+      />
+      </div>
+  );
+};
+
+const uploadToServer = (file, onUploadProgress) => {
+  let formData = new FormData();
+
+  formData.append("file", file);
+
+  return axios.post('http://localhost:8080/api/csv/upload', formData, {
+    headers: {
+      "Content-Type": "multipart/form-data",
+    },
+    onUploadProgress,
+  });
+};
+
+function App() {
+
+  const [data, setData] = useState([]);
+  const [selectedFiles, setSelectedFiles] = useState(undefined);
+  const [currentFile, setCurrentFile] = useState(undefined);
+  const [progress, setProgress] = useState(0);
+  const [message, setMessage] = useState("");
+
+  const columns = useMemo(
+    () => [
+      {
+        Header: "Employee Details",
+        columns: [
+          {
+            Header: "Avatar",
+            accessor: "avatar",
+            Cell: ({ cell: { value } }) => <Avatar value={value} />
+          },
+          {
+            Header: "Name",
+            accessor: "name"
+          },
+          {
+            Header: "Email",
+            accessor: "email"
+          },
+          {
+            Header: "Username",
+            accessor: "username"
+          },
+          {
+            Header: "DOB",
+            accessor: "dob"
+          },
+          {
+            Header: "Company",
+            accessor: "company"
+          },
+          {
+            Header: "Address",
+            accessor: "address"
+          },
+          {
+            Header: "Location",
+            accessor: "location"
+          },
+          {
+            Header: "Salary",
+            accessor: "salary"
+          },
+          {
+            Header: "Role",
+            accessor: "role"
+          },
+          {
+            Header: "Direct Reportee",
+            accessor: "children",
+            Cell: ({ cell: { value } }) => <Children values={value} />
+          }
+        ]
+      }
+    ],
+    []
+  );
+
+  useEffect(() => {
+    (async () => {
+      const result = await axios("http://localhost:8080/api/employees");
+      setData(result.data);
+    })();
+  }, []);
+
+  const selectFile = (event) => {
+    setSelectedFiles(event.target.files);
+  };
+
+  const upload = () => {
+    let currentFile = selectedFiles[0];
+
+    setProgress(0);
+    setCurrentFile(currentFile);
+
+    uploadToServer(currentFile, (event) => {
+      setProgress(Math.round((100 * event.loaded) / event.total));
+    })
+      .then(async (response) => {
+        setMessage(response.data.message);
+        const result = await axios("http://localhost:8080/api/employees");
+        setData(result.data);
+      })
+      .catch(() => {
+        setProgress(0);
+        setMessage("Could not upload the file!");
+        setCurrentFile(undefined);
+      });
+
+    setSelectedFiles(undefined);
+  };
+
+  return (
+    <div className="App">
+      <div>
+      {currentFile && (
+        <div className="progress">
+          <div
+            className="progress-bar progress-bar-info progress-bar-striped"
+            role="progressbar"
+            aria-valuenow={progress}
+            aria-valuemin="0"
+            aria-valuemax="100"
+            style={{ width: progress + "%" }}
+          >
+            {progress}%
+          </div>
+        </div>
+      )}
+
+      <label className="btn btn-default">
+        <input type="file" onChange={selectFile} />
+      </label>
+
+      <button
+        className="btn btn-success"
+        disabled={!selectedFiles}
+        onClick={upload}
+      >
+        Upload
+      </button>
+
+      <div className="alert alert-light" role="alert">
+        {message}
+      </div>
+    </div>
+      <Table columns={columns} data={data} />
+    </div>
+  );
+}
+
+export default App;

nodejs/node-csv-importer/client/src/App.test.js

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+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

nodejs/node-csv-importer/client/src/Table.js

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+import React, { useState } from "react";
+import { useTable, useFilters, useSortBy } from "react-table";
+
+export default function Table({ columns, data }) {
+  const [filterInput, setFilterInput] = useState("");
+  // Use the state and functions returned from useTable to build your UI
+  const {
+    getTableProps,
+    getTableBodyProps,
+    headerGroups,
+    rows,
+    prepareRow,
+    setFilter
+  } = useTable(
+    {
+      columns,
+      data
+    },
+    useFilters,
+    useSortBy
+  );
+
+  const handleFilterChange = e => {
+    const value = e.target.value || undefined;
+    setFilter("name", value);
+    setFilterInput(value);
+  };
+
+  // Render the UI for your table
+  return (
+    <>
+      <input
+        value={filterInput}
+        onChange={handleFilterChange}
+        placeholder={"Search name"}
+      />
+      <table {...getTableProps()}>
+        <thead>
+          {headerGroups.map(headerGroup => (
+            <tr {...headerGroup.getHeaderGroupProps()}>
+              {headerGroup.headers.map(column => (
+                <th
+                  {...column.getHeaderProps(column.getSortByToggleProps())}
+                  className={
+                    column.isSorted
+                      ? column.isSortedDesc
+                        ? "sort-desc"
+                        : "sort-asc"
+                      : ""
+                  }
+                >
+                  {column.render("Header")}
+                </th>
+              ))}
+            </tr>
+          ))}
+        </thead>
+        <tbody {...getTableBodyProps()}>
+          {rows.map((row, i) => {
+            prepareRow(row);
+            return (
+              <tr {...row.getRowProps()}>
+                {row.cells.map(cell => {
+                  return (
+                    <td {...cell.getCellProps()}>{cell.render("Cell")}</td>
+                  );
+                })}
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </>
+  );
+}

nodejs/node-csv-importer/client/src/index.css

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+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

nodejs/node-csv-importer/client/src/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import './index.css';
+import App from './App';
+import reportWebVitals from './reportWebVitals';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

nodejs/node-csv-importer/client/src/logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>

nodejs/node-csv-importer/client/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

nodejs/node-csv-importer/client/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

nodejs/node-csv-importer/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "node-csv-importer",
+  "version": "1.0.0",
+  "description": "This code shows how we can build a CSV importer with frameworks and libraries common in the Node.js tech stack.",
+  "main": "server/index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server/index.js",
+    "build": "cd client && npm install && npm run build"
+  },
+  "type": "module",
+  "keywords": [
+    "node",
+    "csv",
+    "express",
+    "multer",
+    "fast-csv",
+    "postgresql",
+    "sequelize"
+  ],
+  "author": "arpendu",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "fast-csv": "^4.3.6",
+    "json2csv": "^5.0.7",
+    "multer": "^1.4.5-lts.1",
+    "pg": "^8.8.0",
+    "sequelize": "^6.25.5"
+  }
+}

nodejs/node-csv-importer/server/config/db.config.js

@@ -0,0 +1,20 @@
+const HOST = "10.204.133.84";
+const USER = "postgres";
+const PASSWORD = "Welcome123";
+const DB = "csvdb";
+const dialect = "postgres";
+const pool = {
+    max: 5,
+    min: 0,
+    acquire: 30000,
+    idle: 10000
+};
+
+export default {
+    HOST,
+    USER,
+    PASSWORD,
+    DB,
+    dialect,
+    pool
+};

nodejs/node-csv-importer/server/controllers/csv.controller.js

@@ -0,0 +1,79 @@
+import Employee from '../models/employee.model.js';
+import { createReadStream } from 'fs';
+import { parse } from 'fast-csv';
+import { Parser as CsvParser } from 'json2csv';
+
+const upload = async (req, res) => {
+  try {
+    if (req.file == undefined) {
+      return res.status(400).send("Please upload a CSV file!");
+    }
+
+    let employees = [];
+    let path = "./resources/static/assets/uploads/" + req.file.filename;
+
+    createReadStream(path)
+      .pipe(parse({ headers: true }))
+      .on("error", (error) => {
+        throw error.message;
+      })
+      .on("data", (row) => {
+        employees.push(row);
+      })
+      .on("end", () => {
+        Employee.bulkCreate(employees)
+          .then(() => {
+            res.status(200).send({
+              message: "The file: "
+               + req.file.originalname
+               + " got uploaded successfully!!",
+            });
+          })
+          .catch((error) => {
+            res.status(500).send({
+              message: "Couldn't import data into database!",
+              error: error.message,
+            });
+          });
+      });
+  } catch (error) {
+    console.log(error);
+    res.status(500).send({
+      message: "Failed to upload the file: " + req.file.originalname,
+    });
+  }
+};
+
+const download = (_req, res) => {
+  Employee.findAll().then((objs) => {
+    let employees = [];
+
+    objs.forEach((obj) => {
+      const { id, name, email,
+        username, dob, company,
+        address, location, salary,
+        about, role } = obj;
+      employees.push({ id, name, email,
+        username, dob, company,
+        address, location, salary,
+        about, role });
+    });
+
+    const csvFields = ['id', 'name', 'email',
+                     'username', 'dob', 'company',
+                     'address', 'location', 'salary',
+                     'about', 'role'];
+    const csvParser = new CsvParser({ csvFields });
+    const csvData = csvParser.parse(employees);
+
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', 'attachment; filename=employees.csv');
+
+    res.status(200).end(csvData);
+  });
+};
+
+export default {
+  upload,
+  download,
+};

nodejs/node-csv-importer/server/controllers/employee.controller.js

@@ -0,0 +1,27 @@
+import Employee from '../models/employee.model.js';
+
+const getEmployees = (_req, res) => {
+    Employee.findAll({
+        include: [{
+            model: Employee,
+            as: 'children',
+            attributes: ['id', 'name', 'email', 'username', 'avatar'],
+            required: true
+        }],
+        attributes: {
+            exclude: ['managedBy']
+        }
+    })
+      .then((data) => {
+        res.send(data);
+      })
+      .catch((err) => {
+        res.status(500).send({
+          message:
+            err.message
+             || "There might be some error occurred while retrieving employees from database.",
+        });
+      });
+  };
+
+export default getEmployees;

nodejs/node-csv-importer/server/database/index.js

@@ -0,0 +1,25 @@
+import Sequelize from 'sequelize';
+import dbConfig from '../config/db.config.js';
+
+export const sequelize =  new Sequelize(dbConfig.DB, dbConfig.USER, dbConfig.PASSWORD, {
+    host: dbConfig.HOST,
+    dialect: dbConfig.dialect,
+    pool: dbConfig.pool,
+    logging: console.log
+  }
+);
+
+sequelize.authenticate()
+  .then(() => {
+    console.log('Connection has been established successfully.');
+    console.log('Creating tables ===================');
+    sequelize.sync().then(() => {
+        console.log('=============== Tables created per model');
+    })
+    .catch(err => {
+        console.error('Unable to create tables:', err);    
+    })
+  })
+  .catch(err => {
+    console.error('Unable to connect to the database:', err);
+});

nodejs/node-csv-importer/server/index.js

@@ -0,0 +1,28 @@
+import express from 'express';
+import path from 'path';
+import cors from 'cors';
+import initRoutes from './routes/index.js';
+
+global.__basedir = path.resolve() + "/..";
+
+const app = express();
+
+var corsOptions = {
+  origin: "http://localhost:3000"
+};
+
+app.use(cors(corsOptions));
+
+// parse requests of content-type - application/json
+app.use(express.json());
+
+// parse requests of content-type - application/x-www-form-urlencoded
+app.use(express.urlencoded({ extended: true }));
+
+initRoutes(app);
+
+// set port, listen for requests
+const PORT = process.env.PORT || 8080;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}.`);
+});

nodejs/node-csv-importer/server/middleware/upload.js

@@ -0,0 +1,33 @@
+import fs from 'fs';
+import multer from 'multer';
+
+const storage = multer.diskStorage({
+  destination: (_req, file, cb) => {
+    console.log(file.originalname);
+    const dir = './resources/static/assets/uploads';
+    if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, { recursive: true });
+    }
+    cb(null, dir);
+  },
+  filename: (_req, file, cb) => {
+    console.log(file.originalname);
+    cb(null, `${Date.now()}-${file.originalname}`);
+  },
+});
+
+const csvFilter = (_req, file, cb) => {
+  console.log('Reading file in middleware', file.originalname);
+  if (file == undefined) {
+    cb('Please upload a file to proceed.', false);
+  } else if (file.mimetype.includes('csv')) {
+    cb(null, true);
+  } else {
+    cb('Please upload only csv file as only CSV is supported for now.', false);
+  }
+};
+
+export default multer({
+    storage: storage,
+    fileFilter: csvFilter
+});

nodejs/node-csv-importer/server/models/employee.model.js

@@ -0,0 +1,68 @@
+import Sequelize from 'sequelize';
+import { sequelize } from '../database/index.js';
+
+const Employee = sequelize.define("employee", {
+    id: {
+      type: Sequelize.STRING,
+      primaryKey: true
+    },
+    name: {
+      type: Sequelize.STRING
+    },
+    email: {
+      type: Sequelize.STRING
+    },
+    username: {
+      type: Sequelize.STRING
+    },
+    dob: {
+      type: Sequelize.STRING
+    },
+    company: {
+      type: Sequelize.STRING
+    },
+    address: {
+      type: Sequelize.STRING
+    },
+    location: {
+      type: Sequelize.STRING
+    },
+    salary: {
+      type: Sequelize.STRING
+    },
+    about: {
+      type: Sequelize.STRING
+    },
+    role: {
+      type: Sequelize.STRING
+    },
+    managedBy: {
+      type: Sequelize.STRING,
+      references: {
+          model: 'employees',
+          key: 'id'
+      }
+    },
+    createdAt: {
+      type: Sequelize.STRING
+    },
+    updatedAt: {
+      type: Sequelize.STRING
+    },
+    avatar: {
+      type: Sequelize.STRING
+    }
+  });
+
+Employee.hasMany(Employee, {
+    as: 'children',
+    foreignKey: 'managedBy',
+    sourceKey: 'id',
+    useJunctionTable: false
+  });
+Employee.belongsTo(Employee, {
+    foreignKey: "managedBy",
+    targetKey: "id",
+  });
+
+export default Employee;

nodejs/node-csv-importer/server/routes/index.js

@@ -0,0 +1,19 @@
+import { Router } from 'express';
+import csvController from '../controllers/csv.controller.js';
+import getEmployees from '../controllers/employee.controller.js';
+import uploadFile from '../middleware/upload.js';
+
+const router = Router();
+
+let routes = (app) => {
+  // CSV
+  router.post('/csv/upload', uploadFile.single('file'), csvController.upload);
+  router.get('/csv/download', csvController.download);
+
+  // Employees
+  router.get('/employees', getEmployees);
+
+  app.use("/api", router);
+};
+
+export default routes;