Build A ToDoApp With Vue.js, Node.js, And SQLite

Jan 14, 2026 by Editorial Team 49 views

Building a ToDoApp: A Codex Discussion Project

Hey guys! Let's dive into building a cool ToDoApp using some awesome technologies. This is going to be a fun project where we'll leverage my capabilities to get this app up and running. I'll walk you through the entire process, explaining every step along the way. Our goal is to create a fully functional web application, and we'll be using Vue.js 3, ViteJS, TypeScript, Node.js, ExpressJS, and SQLite 3. Sounds good?

Project Overview: The ToDoApp

So, what exactly are we building? The ToDoApp is a simple yet essential application for managing tasks. Think of it as your digital to-do list where you can add, edit, mark as complete, and delete tasks. Here’s a breakdown of the features we'll be implementing:

Add a new task: Users will be able to input a task description and add it to their list.
Edit an existing task: Users should be able to modify the task description of any task on their list.
Mark a task as completed: Users can mark tasks as done, visually indicating their completion.
Remove a task: Users should be able to delete tasks they no longer need.

Now, the really interesting part: I won't be writing any code manually. I'll be generating it all for you based on our interactions and your prompts. This approach is similar to how we might develop a real project collaboratively! We'll start with the initial setup, moving on to the front-end, the back-end, and the database. Each step will be discussed and explained. I'll make sure every technical decision is crystal clear, making this a learning experience for everyone involved. To correct any issues, we'll iterate with new prompts, making sure we get everything just right. We're going to build this ToDoApp together, step by step, and it’s going to be awesome! So let's get started!

Setting the Stage: Project Initialization

Alright, let’s kick things off with the project setup. First, we need to initialize our project. We will use ViteJS to bootstrap the front-end. Vite is a build tool that offers an incredibly fast development experience. I will guide you through the initial setup, ensuring we have a solid foundation. After that, we'll structure the front-end to house our Vue.js components. Next up is setting up the back-end. I'll configure a Node.js environment with ExpressJS for handling our API endpoints. Finally, we'll establish a database connection using SQLite 3 to store our task data. This phase involves setting up the development environment, installing dependencies, and creating the basic file structure for our project. It ensures that everything is ready for the core functionality. I'll start by initializing a new project using Vite. I will choose a Vue.js template with TypeScript, as requested, to get us started with a structured front-end.

Here’s how we'll initialize the project:

# Using npm
npm create vite@latest todoapp-codex --template vue-ts

This command sets up our project directory, installs the necessary dependencies, and creates the initial project structure. It includes everything we need to run a basic Vue.js application.

Next, let’s navigate into our project directory and install the necessary dependencies for our back-end, and database. We will utilize npm to install the packages: ExpressJS for the server, and SQLite3 to save our task data.

cd todoapp-codex
npm install express sqlite3 cors

These commands create the basic foundation for the front-end and back-end, including the necessary tools and libraries to start building our ToDoApp.

Front-End Development: Crafting the User Interface

Now, let's talk about the front-end, where the magic of user interaction happens. Here's where we'll bring our ToDoApp to life with Vue.js 3 and TypeScript. We will build the user interface and handle all the interactions within the ToDoApp. The front-end will be designed to be intuitive and user-friendly. I'll take care of creating the components that make up the ToDoApp's interface. Our UI will include a form for adding new tasks, a list to display tasks, and controls to edit, mark as complete, and delete tasks. We will make it dynamic and responsive. The components will communicate with the back-end through API requests. We’ll design it to be clean, and easy to use. The goal here is to give users a seamless experience. We will use TypeScript to maintain type safety and enhance code maintainability and will ensure proper UI rendering.

Let’s start by defining our main components. We'll have a main component to contain the other components, a task input component for adding tasks, and a task list component to display the tasks. Each component will be responsible for a specific aspect of the application.

Here’s a conceptual view of how these components will fit together:

App.vue: The main container, managing the overall structure.
TaskInput.vue: A component with an input field for new tasks.
TaskList.vue: A component displaying tasks with controls (edit, complete, delete).

Here is a basic structure for App.vue:

<template>
  <div class="container">
    <h1>ToDoApp</h1>
    <TaskInput @addTask="addTask" />
    <TaskList :tasks="tasks" @taskUpdated="updateTask" @taskDeleted="deleteTask" />
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue';
import TaskInput from './components/TaskInput.vue';
import TaskList from './components/TaskList.vue';

const tasks = ref<any[]>([]);

const addTask = (newTask: any) => {
  // Implement adding the task.
  console.log('Adding task:', newTask);
};

const updateTask = (updatedTask: any) => {
  // Implement updating the task.
  console.log('Updating task:', updatedTask);
};

const deleteTask = (taskId: number) => {
  // Implement deleting the task.
  console.log('Deleting task:', taskId);
};

</script>

<style scoped>
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}
</style>

This basic setup gives us a clear structure to build our ToDoApp's front-end. We'll refine these components as we integrate them with the back-end and database.

Back-End Development: Handling Data and Logic

Alright, let's switch gears and focus on the back-end. This is where we'll handle all the behind-the-scenes magic. It's crucial for managing data and the application's logic. Our back-end will be built using Node.js and ExpressJS. It will provide the necessary APIs for our front-end to interact with, including creating, reading, updating, and deleting tasks. The back-end handles data storage, retrieval, and modification. We'll implement endpoints for tasks, managing requests from the front-end, and interacting with the database to ensure tasks are saved, retrieved, and updated correctly. This involves setting up the server, defining the API routes, and connecting to our SQLite 3 database. We are going to make it scalable. Our back-end needs to respond to requests, and ensure data integrity.

We will start by setting up the Express server and defining the API endpoints. Let’s create a file named server.ts in the root of our project directory.

Here’s a basic server.ts file:

import express, { Request, Response } from 'express';
import cors from 'cors';
import sqlite3 from 'sqlite3';

const app = express();
const port = process.env.PORT || 3000;

app.use(cors());
app.use(express.json());

const db = new sqlite3.Database(':memory:');

db.serialize(() => {
  db.run("CREATE TABLE IF NOT EXISTS tasks (id INTEGER PRIMARY KEY AUTOINCREMENT, text TEXT, completed INTEGER)");
});

app.get('/api/tasks', (req: Request, res: Response) => {
  // Implement fetching tasks.
  res.json([]);
});

app.post('/api/tasks', (req: Request, res: Response) => {
  // Implement adding tasks.
  res.status(201).json({ id: 1, text: req.body.text, completed: 0 });
});

app.put('/api/tasks/:id', (req: Request, res: Response) => {
  // Implement updating tasks.
  res.json({ id: parseInt(req.params.id), text: req.body.text, completed: req.body.completed });
});

app.delete('/api/tasks/:id', (req: Request, res: Response) => {
  // Implement deleting tasks.
  res.status(204).send();
});

app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

This code sets up our server, defines the routes for our API, and establishes a basic database connection. We’ll expand these implementations as we progress. The database connection is set up and tested for functionality. With these steps, the back-end can efficiently handle requests.

Database Integration: Storing Task Data

Let’s move on to database integration. Here we'll configure SQLite 3 to manage and store task data. We'll design the database schema, write queries, and handle all interactions with the database. The database integration is critical to ensure data persistence and reliability. This means we're going to create the database table, define the data structure, and implement functions to add, read, update, and delete tasks. We must make sure that our data can be stored, retrieved, and modified correctly. This step ensures that our task data is always up-to-date and accessible. We want the database to work seamlessly.

Let’s define the schema for our task data. Each task will have an ID, text, and a completion status. We'll use the following schema:

id: INTEGER (primary key, auto-incrementing)
text: TEXT (the task description)
completed: INTEGER (0 for incomplete, 1 for complete)

We can run a script to create the table, initialize the database connection, and ensure it’s ready to store data. We'll use the sqlite3 module in Node.js to interact with the database. The database operations will be encapsulated within functions to handle CRUD (Create, Read, Update, Delete) operations. This includes adding new tasks, updating existing tasks, marking tasks as complete, and deleting tasks. The database handles the data persistence and maintains the tasks across sessions. This ensures the app is responsive.

Here’s how to create the table, using the sample server.ts code, as an example:

const db = new sqlite3.Database(':memory:');

db.serialize(() => {
  db.run("CREATE TABLE IF NOT EXISTS tasks (id INTEGER PRIMARY KEY AUTOINCREMENT, text TEXT, completed INTEGER)");
});

This simple code initializes the database and creates the necessary table for storing our tasks. The implementation includes methods to add, retrieve, update, and delete tasks.

Connecting the Dots: API Integration

Now, let's talk about API integration. We will connect the front-end to the back-end API. This is where the magic happens, connecting the UI to the data and logic. We'll create the necessary API calls using fetch or a similar tool to interact with the back-end endpoints. API integration is essential for seamless data flow. The front-end needs to send requests to the back-end to add, retrieve, update, and delete tasks. The API handles data exchange between the front-end and the database. We will use the fetch API to make requests to the back-end. Each component in the front-end will call the API endpoints to perform actions on the task list. The interactions will be clean and efficient. This ensures data is correctly displayed and synchronized across the application. This step involves creating functions to handle API calls, updating the UI based on API responses, and managing the state of the application. The goal is to make the app dynamic.

Here’s an example for fetching tasks in App.vue:

<script setup lang="ts">
import { ref, onMounted } from 'vue';
import TaskInput from './components/TaskInput.vue';
import TaskList from './components/TaskList.vue';

const tasks = ref<any[]>([]);

const fetchTasks = async () => {
  try {
    const response = await fetch('http://localhost:3000/api/tasks');
    const data = await response.json();
    tasks.value = data;
  } catch (error) {
    console.error('Error fetching tasks:', error);
  }
};

onMounted(() => {
  fetchTasks();
});

const addTask = (newTask: any) => {
  // Implement adding the task.
  console.log('Adding task:', newTask);
};

const updateTask = (updatedTask: any) => {
  // Implement updating the task.
  console.log('Updating task:', updatedTask);
};

const deleteTask = (taskId: number) => {
  // Implement deleting the task.
  console.log('Deleting task:', taskId);
};
</script>

This code snippet demonstrates a simple fetch request to retrieve tasks from our API. The integration ensures real-time updates and synchronization. The component is connected to our API. The response is handled efficiently. This setup forms the foundation of our application's interaction with the back-end.

Testing and Deployment: Making it Live

Finally, let's cover testing and deployment. It's super important to make sure everything works correctly before launching. We will write tests to ensure our application functions as expected. Testing verifies the correct behavior of the application's components and API endpoints. The testing will cover adding, editing, completing, and deleting tasks. After testing, the application is deployed. Deployment involves making the application accessible to users through a web server. The application is now ready for real-world use. This step ensures that our ToDoApp is reliable and ready for users. We will implement these steps as part of our process. Testing and deployment are the final steps.

Conclusion: Wrapping Up

And there you have it, a detailed plan to build a complete ToDoApp using modern web technologies! We'll start by initializing the project, followed by front-end development, back-end development, database integration, and API integration. We will test and deploy the final product. We'll use Vue.js 3, ViteJS, TypeScript, Node.js, ExpressJS, and SQLite 3. Throughout the entire process, I'll provide detailed explanations and guidance. We will create a fantastic application that is fully functional. Now, let’s get those prompts ready and start building!