Vibe Coding · Leçon

Stocker les données simplement

Du stockage local à une véritable base de données.

Stocker les données simplement est une leçon Vibe Coding gratuite sur CoddyKit. Ceci est la leçon 3 sur 4. Tu peux lire la leçon complète ci-dessous gratuitement — puis la pratiquer en direct dans le navigateur avec un éditeur de code intégré et un tuteur IA 24/7. Elle fait partie du parcours d'apprentissage Vibe Coding, et ta progression se synchronise sur le web et l'application CoddyKit. Le cours Vibe Coding comprend 4 leçons au total.

Certaines parties de cette leçon n'ont pas encore été traduites et s'affichent en anglais.

Data That Sticks Around

Most apps need to remember things: your to-do list, your saved notes, the dark-mode setting you chose. Without storage, everything disappears when you refresh the page.

The good news: you can go from 'remembers nothing' to 'remembers everything' just by describing what to save — AI handles the storage code.

The Storage Ladder

There are levels of storage, from simplest to most powerful. Start low and climb only when you need to:

In memory — fast but forgotten on refresh
Local storage — saved in the user's browser, survives refresh
A database — shared across devices and users, the real deal

Telling AI which rung you want keeps your app as simple as possible.

Saving to the Browser

The easiest persistent storage is localStorage — a little notebook the browser keeps for your app. It's perfect for settings and small lists on a single device.

You don't need a server or account for this. A prompt like the one below adds it instantly.

Make my to-do list save to the browser's
localStorage so my tasks are still there after I
refresh the page. Load them automatically when the
page opens.

How localStorage Works

localStorage stores text by a name (a 'key'). To save objects or lists, you turn them into JSON text first, then turn them back when reading.

Run this to see the pattern AI uses: save a value, then read it back.

const settings = { theme: 'dark', fontSize: 16 };

const saved = JSON.stringify(settings);
console.log('Saved text:', saved);

const loaded = JSON.parse(saved);
console.log('Theme is:', loaded.theme);

When localStorage Isn't Enough

localStorage only lives in one browser on one device. If you want users to see their data on their phone and laptop, or share data between users, you need a database on a server.

That sounds scary, but tools make it easy. You'll describe what to store, and AI sets up the database calls.

Easy Databases for Vibe Coders

You don't need to run your own server. Hosted databases give you storage with almost no setup:

Supabase — a friendly database with built-in login, great with AI tools
Firebase — Google's real-time database
Airtable — a spreadsheet that acts like a database

Builders like Bolt, Lovable and Replit can connect these for you when you ask.

Adding a Database by Prompt

To add real storage, describe what you're saving and where. Naming Supabase (a popular choice) tells AI exactly which setup to generate.

This prompt turns a local-only app into one with a shared, persistent database.

Connect this app to Supabase. Create a table called
notes with columns: id, title, content, and
created_at. Update the app so saving a note inserts
a row, and the homepage loads all notes from the
table, newest first.

Thinking in Tables

A database stores data in tables — like spreadsheets with named columns. A 'notes' table might have a title, content, and a date. Each saved note is one row.

You don't need to master database design. Just tell AI what fields each thing has, and it builds the table for you.

Create, Read, Update, Delete

Almost every data app does four things, nicknamed CRUD: Create new items, Read them back, Update them, and Delete them. If your app can do all four, it's a real tool.

You can ask AI to add them one at a time, testing each before moving on.

Add full editing to my notes app: I should be able
to create a note, edit an existing note's title and
content, and delete a note with a confirm dialog.
Keep everything saved to Supabase.

Start Simple, Upgrade Later

The pro move is to start at the lowest rung that works. Building a quick prototype? localStorage. Need it on every device? Move up to a database. AI can even migrate you — 'switch my app from localStorage to Supabase.'

Don't over-engineer early. Match the storage to what your app actually needs today.

My app currently uses localStorage. Migrate it to
use Supabase instead so my data syncs across
devices, and move any existing local data into the
database on first load.

Backups and Not Losing Data

Data is precious — users get upset if it vanishes. Hosted databases like Supabase and Firebase keep backups for you, which is another reason to graduate from localStorage for anything important.

You can also let users export their own data as a safety net. Ask AI to add a one-click backup so nobody loses their work.

Add a "Download backup" button that exports all my
notes from the database as a JSON file, and an
"Import backup" option that restores them. This
way users never lose their data.

Quick Check

You built a notes app that uses the browser's localStorage. A user complains they can't see their notes when they open the app on their phone. What kind of storage do they actually need?

Recap: Storing Data Simply

You learned the storage ladder: in-memory, then localStorage for single-device persistence, then a real database for cross-device, shared data.

You saw how to save settings in the browser, when to upgrade to hosted databases like Supabase, how data lives in tables, and the CRUD actions every data app needs. Start simple and let AI upgrade you. Next: keeping your API keys and secrets safe.

Questions Fréquemment Posées

La leçon « Stocker les données simplement » est-elle gratuite ?

Oui — le texte complet de « Stocker les données simplement » est gratuit à lire ici sur le web. Pour la pratiquer de manière interactive (un éditeur de code intégré et un tuteur IA 24/7) et déverrouiller le reste du cours Vibe Coding, passe à CoddyKit PRO. Le cours Vibe Coding comprend 4 leçons au total.

Qu'est-ce que j'apprendrai dans « Stocker les données simplement » ?

Du stockage local à une véritable base de données. Tu pratiques Vibe Coding avec du code pratique que tu exécutes directement dans le navigateur, et un tuteur IA 24/7 répond à tes questions au fur et à mesure que tu avances dans la leçon.

Dois-je avoir de l'expérience pour commencer Vibe Coding ?

Aucune expérience préalable n'est requise. Vibe Coding sur CoddyKit est structuré pour les débutants jusqu'aux apprenants avancés, donc tu peux commencer ici ou depuis le début et avancer à ton rythme. Ceci est la leçon 3 sur 4.

Combien de temps prend la leçon « Stocker les données simplement » ?

La plupart des leçons CoddyKit prennent environ 5–10 minutes. Chacune est courte et interactive, tu progresses régulièrement et tu repiques exactement où tu t'es arrêté sur le web et l'app.

Peux-tu écrire et exécuter du code dans cette leçon Vibe Coding ?

Oui. Chaque leçon Vibe Coding inclut un éditeur de code intégré, tu écris et exécutes du vrai code directement dans ton navigateur et tu reçois des retours IA instantanés — aucune configuration locale requise.

Toutes les leçons de ce cours

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