# 10 Projects for Implementing CRUD Operations with Databases in the App Ideas Repository

> Explore 10 app ideas from florinpop17/app-ideas demonstrating database CRUD operations with IndexedDB, MongoDB, and PostgreSQL. Build your skills today.

- Repository: [Florin Pop/app-ideas](https://github.com/florinpop17/app-ideas)
- Tags: tutorial
- Published: 2026-02-27

---

**The florinpop17/app-ideas repository contains ten curated project specifications across beginner, intermediate, and advanced tiers that explicitly require implementing Create, Read, Update, and Delete (CRUD) operations using databases ranging from browser-based IndexedDB to server-side MongoDB and PostgreSQL.**

The **App Ideas** repository by florinpop17 provides structured project specifications for developers looking to practice full-stack skills. Several entries specifically target **implementing CRUD operations with databases**, offering blueprints for both client-side storage solutions and server-side persistent layers. Each specification includes suggested technology stacks and explicit CRUD requirements for managing persistent data.

## Beginner-Tier Database CRUD Projects

The beginner tier introduces fundamental **CRUD** concepts using simple storage mechanisms.

### Recipe App

According to [`Projects/1-Beginner/Recipe-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/1-Beginner/Recipe-App.md), this project requires building an application to manage cooking recipes. The specification suggests using either a **file-based storage** system or a lightweight database like **SQLite** to persist recipe data. Developers must implement full **CRUD** functionality allowing users to create new recipes, retrieve and display existing ones, update ingredients or instructions, and delete unwanted entries.

### First DB App

The [`Projects/1-Beginner/First-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/1-Beginner/First-DB-App.md) specification serves as an introductory guide to browser-based databases. It explicitly requires using **IndexedDB** to perform basic **CRUD** operations on a customer database. The project focuses on populating the store with initial data, clearing records, and querying specific entries through the IndexedDB API.

## Intermediate-Tier Database CRUD Projects

Intermediate projects introduce more complex data relationships and alternative database technologies.

### Sales DB App

Specified in [`Projects/2-Intermediate/Sales-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/2-Intermediate/Sales-DB-App.md), this project demonstrates **client-side CRUD** using the browser's **IndexedDB**. The application must handle sales receipts with capabilities to add new transactions, list historical sales, edit receipt details, and delete records. The specification emphasizes transactional integrity within the browser storage layer.

### Simple Online Store

The [`Projects/2-Intermediate/Simple-Online-Store.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/2-Intermediate/Simple-Online-Store.md) project requires a **server-side database** such as **PostgreSQL** or **MongoDB** to manage a product catalog. This specification calls for complete **CRUD** operations on product entities, including adding new inventory items, viewing product details, updating prices and stock levels, and removing discontinued products. The project optionally includes authentication to restrict destructive operations to admin users.

### Voting App

According to [`Projects/2-Intermediate/Voting-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/2-Intermediate/Voting-App.md), this project involves storing items and their associated vote counts. While flexible on technology, the specification suggests **Firebase Realtime Database** for live synchronization. The **CRUD** implementation must support creating new voting items, reading current vote tallies, updating vote counts in real-time, and deleting items from the poll.

### This-or-That Game

The [`Projects/2-Intermediate/This-or-That-Game.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/2-Intermediate/This-or-That-Game.md) specification requires persisting user choices and aggregate tallies. Using any database such as **MongoDB**, the application must record individual selections (**Create**), read aggregate statistics (**Read**), update choice tallies (**Update**), and optionally purge historical data (**Delete**).

## Advanced-Tier Database CRUD Projects

Advanced specifications demand full-stack architectures with complex data models and relational integrity.

### Instagram Clone

The [`Projects/3-Advanced/Instagram-Clone-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/3-Advanced/Instagram-Clone-App.md) specification outlines a comprehensive **full-stack CRUD** application using **MongoDB** with **Mongoose**. The project requires managing multiple interconnected entities: `User`, `Post`, `Comment`, and `Follow` relationships. Developers must implement RESTful endpoints for creating posts with image uploads, retrieving feeds and individual posts, updating captions, and deleting content. The specification references GridFS or cloud storage for handling binary image data alongside document references.

### Chat App

As defined in [`Projects/3-Advanced/Chat-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/3-Advanced/Chat-App.md), this project requires persisting chat messages to a database such as **MongoDB** or **PostgreSQL**. The **CRUD** implementation must handle creating new messages, retrieving conversation history with pagination, editing existing messages (**Update**), and deleting specific messages. This specification emphasizes real-time synchronization alongside persistent storage operations.

### Slack Archiver

The [`Projects/3-Advanced/Slack-Archiver.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/3-Advanced/Slack-Archiver.md) project involves archiving Slack channel messages to a persistent store. The specification supports either **SQL** or **NoSQL** databases and requires **CRUD** operations for importing messages (**Create**), querying archives (**Read**), updating metadata (**Update**), and purging old records (**Delete**).

### MyPodcast Library App

According to [`Projects/3-Advanced/MyPodcast-Library-app.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/3-Advanced/MyPodcast-Library-app.md), this advanced project manages podcast metadata collections. The specification requires **CRUD** functionality for storing podcast details, listing and filtering libraries, updating episode information or subscription status, and removing podcasts from the collection. The database choice remains flexible between SQL and NoSQL solutions.

## Implementation Patterns and Code Examples

Below are concrete implementations demonstrating the **CRUD** patterns required by these project specifications.

### Server-Side CRUD with Node.js and Mongoose

This example implements the **Instagram Clone** post management requirements using **Node.js**, **Express**, and **Mongoose** for **MongoDB** interaction.

```javascript
// models/Post.js
import mongoose from "mongoose";

const PostSchema = new mongoose.Schema({
  caption: String,
  imageUrl: String,
  author: { type: mongoose.Schema.Types.ObjectId, ref: "User" },
  createdAt: { type: Date, default: Date.now },
});

export default mongoose.model("Post", PostSchema);

```

```javascript
// routes/posts.js
import express from "express";
import Post from "../models/Post.js";

const router = express.Router();

// CREATE
router.post("/", async (req, res) => {
  const post = await Post.create(req.body);
  res.status(201).json(post);
});

// READ (single or all)
router.get("/:id", async (req, res) => {
  const post = await Post.findById(req.params.id).populate("author");
  res.json(post);
});
router.get("/", async (_, res) => {
  const posts = await Post.find().populate("author");
  res.json(posts);
});

// UPDATE
router.put("/:id", async (req, res) => {
  const post = await Post.findByIdAndUpdate(req.params.id, req.body, {
    new: true,
  });
  res.json(post);
});

// DELETE
router.delete("/:id", async (req, res) => {
  await Post.findByIdAndDelete(req.params.id);
  res.sendStatus(204);
});

export default router;

```

This pattern replicates across `User`, `Comment`, and `Follow` models to fulfill the full **CRUD** requirements specified in the Instagram Clone project.

### Client-Side CRUD with IndexedDB

This implementation satisfies the **Sales DB App** requirements using the `idb` wrapper for **IndexedDB** operations.

```javascript
import { openDB } from "idb";

const DB_NAME = "sales-db";
const STORE_NAME = "receipts";

export async function getDb() {
  return openDB(DB_NAME, 1, {
    upgrade(db) {
      db.createObjectStore(STORE_NAME, { keyPath: "id", autoIncrement: true });
    },
  });
}

// CREATE
export async function addReceipt(receipt) {
  const db = await getDb();
  return db.add(STORE_NAME, receipt);
}

// READ (all)
export async function getAllReceipts() {
  const db = await getDb();
  return db.getAll(STORE_NAME);
}

// UPDATE
export async function updateReceipt(id, updates) {
  const db = await getDb();
  const receipt = await db.get(STORE_NAME, id);
  const updated = { ...receipt, ...updates };
  return db.put(STORE_NAME, updated);
}

// DELETE
export async function deleteReceipt(id) {
  const db = await getDb();
  return db.delete(STORE_NAME, id);
}

```

These atomic operations provide the four **CRUD** functions required by the Sales DB App specification, callable directly from UI event handlers in vanilla JavaScript or framework components.

## Summary

- The **App Ideas** repository provides ten distinct specifications for **implementing CRUD operations with databases**, spanning difficulty tiers from beginner to advanced.
- **Beginner projects** ([`Recipe-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Recipe-App.md), [`First-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/First-DB-App.md)) introduce file-based or **IndexedDB** storage patterns for basic data persistence.
- **Intermediate specifications** ([`Sales-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Sales-DB-App.md), [`Simple-Online-Store.md`](https://github.com/florinpop17/app-ideas/blob/main/Simple-Online-Store.md), [`Voting-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Voting-App.md), [`This-or-That-Game.md`](https://github.com/florinpop17/app-ideas/blob/main/This-or-That-Game.md)) expand to include server-side databases like **PostgreSQL** and **MongoDB**, plus real-time options like **Firebase**.
- **Advanced projects** ([`Instagram-Clone-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Instagram-Clone-App.md), [`Chat-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Chat-App.md), [`Slack-Archiver.md`](https://github.com/florinpop17/app-ideas/blob/main/Slack-Archiver.md), [`MyPodcast-Library-app.md`](https://github.com/florinpop17/app-ideas/blob/main/MyPodcast-Library-app.md)) require full-stack architectures with complex relational data, multiple entity types, and RESTful API design.
- Implementation examples demonstrate **Mongoose** for MongoDB document operations and **IndexedDB** with the `idb` wrapper for browser-based transactional storage.

## Frequently Asked Questions

### Which project is best for beginners learning database CRUD operations?

The **First DB App** specified in [`Projects/1-Beginner/First-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/1-Beginner/First-DB-App.md) is specifically designed as an introductory exercise for browser-based **CRUD** using **IndexedDB**. It focuses on fundamental operations like populating a customer database, clearing records, and querying entries without requiring server-side infrastructure or complex authentication.

### What project covers full-stack CRUD with MongoDB and Node.js?

The **Instagram Clone** project defined in [`Projects/3-Advanced/Instagram-Clone-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/3-Advanced/Instagram-Clone-App.md) provides a comprehensive blueprint for **full-stack CRUD** using **MongoDB**, **Mongoose**, and **Node.js**. It requires implementing RESTful endpoints for users, posts, comments, and follows, with explicit references to handling image uploads via GridFS or cloud storage alongside document references.

### Does the repository include client-side only database projects?

Yes, the **Sales DB App** ([`Projects/2-Intermediate/Sales-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/2-Intermediate/Sales-DB-App.md)) and **First DB App** ([`Projects/1-Beginner/First-DB-App.md`](https://github.com/florinpop17/app-ideas/blob/main/Projects/1-Beginner/First-DB-App.md)) both specify **IndexedDB** as the primary storage mechanism. These projects allow developers to practice **CRUD** operations entirely within the browser using transactional key-value stores, making them ideal for offline-first applications or progressive web apps.

### Which database technologies are recommended across the intermediate projects?

Intermediate specifications suggest diverse technologies including **Firebase Realtime Database** for live-syncing vote counts in the **Voting App**, **PostgreSQL** or **MongoDB** for the **Simple Online Store** product catalog, and flexible SQL or NoSQL options for the **This-or-That Game**. This tier emphasizes choosing appropriate storage solutions based on data relationships and synchronization requirements.