A Guide to Building an Event Planning App: Architecture and Code Examples

A Random App Idea with Architecture and First Code Examples

So you have this amazing app idea in mind, but you’re not sure where to start? Don’t worry, we’ve got you covered! In this article, we will explore a random app idea and discuss its architecture, along with some code examples to help you get started.

App Idea: Event Planning App

Let’s say you want to build an event planning app that helps users organize and manage various types of events. The app should have features such as event creation, guest management, task tracking, and budget planning. It should also provide a seamless user experience and be scalable for future enhancements.


When building an app, it’s crucial to think about its architecture to ensure maintainability, scalability, and flexibility. For our event planning app, we can adopt a layered architecture approach.

1. Presentation Layer

The presentation layer is responsible for handling the user interface and user interactions. It includes components such as screens, views, and UI controllers. In our app, we can use a mobile framework like React Native or Flutter to build the UI.

2. Business Logic Layer

The business logic layer contains the app’s core functionality. It handles tasks like event creation, guest management, task tracking, and budget planning. This layer should be separated from the presentation layer to enable code reusability and easier testing. We can use a combination of libraries and frameworks like Node.js and Express.js to implement the business logic.

3. Data Access Layer

The data access layer handles the app’s interactions with the database or external APIs. It includes components like data models, repositories, and service classes. We can use a database system like MySQL or MongoDB to store event-related data.

First Code Examples

Now that we have a high-level understanding of the app’s architecture, let’s dive into some code examples to give you a head start.

Example 1: Creating an Event

Using the business logic layer, we can implement the creation of an event. Here’s an example code snippet in Node.js:

const express = require('express');
const app = express();

app.post('/events', (req, res) => {
  const eventData = req.body;
  // Perform validation on eventData
  // Save eventData to the database
  res.status(201).json({ message: 'Event created successfully' });

app.listen(3000, () => {
  console.log('Server is running on port 3000');

In this example, we create a route ‘/events’ that listens for a POST request. The event data is extracted from the request body, and then we can perform validations and save the data to the database. Finally, we send a response indicating the success status of the operation.

Example 2: Displaying Events

In the presentation layer, we can create a screen or view to display the user’s events. Here’s an example code snippet using React Native:

import React, { useEffect, useState } from 'react';
import { View, Text } from 'react-native';

const EventListScreen = () => {
  const [events, setEvents] = useState([]);

  useEffect(() => {
    // Fetch events from the API and update the state
  }, []);

  return (
      {events.map((event) => (

export default EventListScreen;

In this example, we use React Native’s ‘useEffect’ hook to fetch the events from the API and update the state. Then, we render the event titles using the ‘map’ function. Each event has a unique ‘id’ and ‘title’ property.

Closing Thoughts

Building an app from scratch can be an exciting and challenging journey. By understanding the app’s architecture and exploring code examples, you now have a solid starting point for your event planning app. Remember to iterate, gather user feedback, and continuously improve your app as you go. Good luck!

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