• PostgreSQL Express React Node (PERN) full-stack app, integrates React frontend with Node.js backend. Tutorial code from The Stoic Programmers (see 'Inspiration' below)

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• General info
• Screenshots
• Technologies
• Setup
• Features
• Status
• Inspiration
• Contact

• PostgreSQL needs to be installed and running - I started it from my Windows 10 PostgreSQL 12 dropdown option 'SQL shell (psql)'
• Postman used to test the backend before frontend was available

• React frontend includes a simple todo list with a user input field and a table of todos below. User can edit and delete todos.
• JavaScript XML (JSX) used to write HTML elements in Javascript
• React Fragments used to show table of todos as a row with columns in the DDM

• PostgreSQL v12
• PostgreSQL Installer for Windows
• Express.js middleware v4
• Node.js v12
• Nodemon npm module so backend server will automatically restart after code changes
• Postman API to simulate a frontend

• React framework v16
• Bootstrap v4 component library

• Change to /server directory
• Install dependencies using npm i
• Install nodemon v2.0.2 globally if you don't already have it
• Install PostgreSQL & run it (requires the password you created during installation)
• Add database access credentials to db.js - recommend installing npm dotenv & using .env to hide credentials if commiting to Github
• Postgresql shell commands: \l list all databases. \c database1 connect to database1. \dt inspect tables. \d+ inspect table & show relation information. \q to quit.
• Run nodemon server for a dev server
• http://localhost:5000/ can be accessed for CRUD operations such as POST, GET, PUT, DELETE etc. using Postman

• Change to /client directory
• Install dependencies using npm i.
• run npm start. Frontend will open at http://localhost:3000/

• backend index.js: express post method used to add new todo [description] to postgreSQL database using SQL INSERT INTO statement

// create a todo
app.post('/todos', async (req, res) => {
  try {
    const { description } = req.body;
    const newTodo = await pool.query(
      "INSERT INTO todo (description) VALUES($1) RETURNING *",
      [description]
    );

    res.json(newTodo.rows[0]);
  } catch (err) {
    console.error(err.message);
  }
})

• function that runs when user presses 'Add' button: the input body (description) is converted from a JavaScript object to a JSON string & POSTed to the todo database

  const onSubmitForm = async e => {
    e.preventDefault();
    try {
      const body = { description };
      const response = await fetch("http://localhost:5000/todos", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(body)
      });

      console.log("Successfully added todo: ", response);
      window.location = "/";
    } catch (err) {
      console.error(err.message);
    }
  };

• All data stored in PostgreSQL database that can also be viewed and changed from the PostgreSQL shell (psql)

• React app created from the command prompt using Create React App
• Uses the Bootstrap basic table to list todos
• Bootstrap 4 Modal dialog box

• Status: error in registration
• To-Do: Fix errors and complete testing

• PERN Stack Course - PostgreSQL, Express, React and Node
• Youtube video: Learn Database Design by combining our JWT and PERN stack Todo List app together Part 1
• Youtube video: Learn Database Design by combining our JWT and PERN stack Todo List app together, part 2
• Youtube video: How to Deploy a PERN application on Heroku
• React documentation
• Enable Emmet support for JSX in Visual Studio Code | React
• js-beautify for VS Code

• Repo created by ABateman - you are welcome to send me a message