spinny:~/writing $ vim create-demo-claude-code-vibecoding.md
1~2**Vibecoding** je nove paradigma vyvoje softwaru, kde programator vede AI agenta pomoci instrukci v prirodzenem jazyce a necha umelou inteligenci psat skutecny kod. Termin vymyslel Andrej Karpathy (spoluzakladatel OpenAI a byvaly reditel AI v Tesle) ve slavnem tweetu z unora 2025: _"Existuje novy druh programovani, ktery nazyvam vibecoding, kde se plne oddate vibracim, primate exponencialy a zapomenete, ze kod vubec existuje."_3~4V tomto clanku si ukazeme, jak vytvorit kompletni, funkcni demo pomoci **Claude Code** jako AI agenta, **Supabase** jako backendu (databaze, autentizace, API) a **Vercel** pro nasazeni - vse s vyuzitim vyhradne **bezplatnych urovni** techto sluzeb.5~6## 1. Co je Vibecoding a proc je revolucni7~8Vibecoding predstavuje fundamentalni zmenu paradigmatu ve vyvoji softwaru. Misto psani kodu radek po radku vyvojar:9~101. **Popisuje**, co chce, v prirodzenem jazyce.112. **AI agent** vygeneruje kompletni kod.123. **Vyvojar** kontroluje, testuje a iteruje.13~14### Proc to funguje15~16- **Rychlost**: projekt, ktery by trval dny, lze postavit za hodiny.17- **Pristupnost**: i mene zkuseni vyvojari mohou stavet funkcni produkty.18- **Rychla iterace**: muzete testovat napady a pivotovat mnohem rychleji.19- **Zamereni na produkt**: soustedite se na _co_ misto _jak_.20~21```mermaid22flowchart LR23 A[Idea] --> B[Natural language prompt]24 B --> C[Claude Code generates code]25 C --> D[Review and test]26 D --> E[Iteration]27 E --> B28 D --> F[Deploy to Vercel]29```30~31### Kdy pouzit Vibecoding32~33Vibecoding je idealni pro:34~35- **Dema a MVP**: rychle vytvoreni prototypu pro overeni napadu.36- **Hackathony**: vytvoreni funkcniho produktu behem nekolika hodin.37- **Vedlejsi projekty**: prozkoumani novych technologii bez investice tydnu.38- **Proof of Concept**: prokazani technicke proveditelnosti zainteresovanym stranam nebo investorum.39~40> **Upozorneni:** Vibecoding je vynikajici pro dema a prototypy. Pro produkcni aplikace s vysokymi pozadavky na bezpecnost a skalovatelnost je dukladna kontrola vygenerovaneho kodu stale nezbytna.41~42## 2. Technologicky stack: Claude Code + Supabase + Vercel43~44### Claude Code45~46Claude Code je AI kodovaci agent od Anthropic. Pracuje primo ve vasem terminalu a muze:47~48- Cist a chapat celou kodovou zakladnu.49- Vytvaret, upravovat a mazat soubory.50- Provadet terminalove prikazy.51- Interagovat s API a externimi sluzbami.52- Spravovat verzovani pomoci Gitu.53- Autonomne iterovat nad chybami a bugy.54~55```bash56# Install Claude Code57npm install -g @anthropic-ai/claude-code58~59# Start in a project directory60cd my-project61claude62```63~64### Supabase (Bezplatna uroven)65~66Supabase je open-source alternativa k Firebase, ktera nabizi:67~68- **PostgreSQL databaze**: kompletni relacni databaze.69- **Autentizace**: prihlaseni pomoci emailu, Google, GitHub atd.70- **REST a Realtime API**: automaticky generovane z vaseho schematu.71- **Uloziste**: pro soubory a obrazky.72- **Edge Functions**: serverless funkce.73~74Bezplatna uroven zahrnuje:75~76| Zdroj | Bezplatny limit |77|----------|-----------|78| Databaze | 500 MB |79| Uloziste | 1 GB |80| Sirka pasma | 5 GB |81| Vyvolani Edge Function | 500K/mesic |82| Autentizovani uzivatele | Neomezene |83| Projekty | 2 aktivni projekty |84~85### Vercel (Bezplatna uroven)86~87Vercel je idealni platforma pro nasazeni Next.js aplikaci:88~89- **Automaticke nasazeni** z GitHubu.90- **Nahledove nasazeni** pro kazdou vetev a PR.91- **Globalni CDN** pro optimalni vykon.92- **Serverless Functions** zahrnuty.93- **Zakladni analytika** zdarma.94~95Bezplatna uroven zahrnuje:96~97| Zdroj | Bezplatny limit |98|----------|-----------|99| Sirka pasma | 100 GB/mesic |100| Provadeni Serverless Function | 100 GB-hodin/mesic |101| Sestaveni | 6 000 minut/mesic |102| Projekty | Neomezene |103| Nasazeni | Neomezene |104~105## 3. Pocatecni nastaveni: Priprava prostredi106~107### Predpoklady108~109Pred zacatkem se ujistete, ze mate:110~111- **Node.js 18+** nainstalovany.112- **Git** nakonfigurovany.113- Ucet na **GitHubu**.114- Ucet na **Supabase** (zdarma na [supabase.com](https://supabase.com)).115- Ucet na **Vercel** (zdarma na [vercel.com](https://vercel.com)).116- **Claude Code** nainstalovany (`npm install -g @anthropic-ai/claude-code`).117~118### Krok 1: Vytvorte projekt119~120Otevrete terminal a spustte Claude Code:121~122```bash123mkdir my-demo-app && cd my-demo-app124claude125```126~127Nyni muzete zacit davat Claude Code instrukce v prirodzenem jazyce:128~129```130You: Create a Next.js 15 project with App Router, TypeScript, Tailwind CSS,131and shadcn/ui. Also initialize a Git repository.132```133~134Claude Code automaticky provede:135~136```bash137npx create-next-app@latest . --typescript --tailwind --eslint --app --src-dir138npx shadcn@latest init139git init && git add . && git commit -m "Initial commit"140```141~142### Krok 2: Nakonfigurujte Supabase143~1441. Jdete na [supabase.com](https://supabase.com) a vytvorte novy projekt.1452. Poznamejte si **URL projektu** a **anon klic** z Settings > API.1463. Vratte se do terminalu s Claude Code:147~148```149You: Add Supabase to the project. Create a .env.local file with the variables150NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY. Configure the151Supabase client with SSR support for Next.js App Router.152```153~154Claude Code vytvori kompletni konfiguraci:155~156```typescript157// src/lib/supabase/client.ts158import { createBrowserClient } from '@supabase/ssr';159~160export function createClient() {161 return createBrowserClient(162 process.env.NEXT_PUBLIC_SUPABASE_URL!,163 process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!164 );165}166```167~168```typescript169// src/lib/supabase/server.ts170import { createServerClient } from '@supabase/ssr';171import { cookies } from 'next/headers';172~173export async function createClient() {174 const cookieStore = await cookies();175~176 return createServerClient(177 process.env.NEXT_PUBLIC_SUPABASE_URL!,178 process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,179 {180 cookies: {181 getAll() {182 return cookieStore.getAll();183 },184 setAll(cookiesToSet) {185 cookiesToSet.forEach(({ name, value, options }) =>186 cookieStore.set(name, value, options)187 );188 },189 },190 }191 );192}193```194~195## 4. Stavba dema: Aplikace pro spravu uloh196~197Pojdme postavit konkretni demo: **aplikaci pro spravu uloh** s autentizaci, plnym CRUD a modernim rozhranim.198~199### Definice databazoveho schematu200~201Dejte Claude Code instrukce k vytvoreni schematu:202~203```204You: Create a SQL migration for Supabase with the following tables:205~2061. profiles: id (uuid, FK to auth.users), username (text), avatar_url (text),207 created_at2082. projects: id (uuid), name (text), description (text), owner_id (uuid, FK209 to profiles), created_at2103. tasks: id (uuid), title (text), description (text), status (enum:211 todo/in_progress/done), priority (enum: low/medium/high), project_id (uuid,212 FK to projects), assigned_to (uuid, FK to profiles), due_date (timestamp),213 created_at, updated_at214~215Enable Row Level Security on all tables and create appropriate policies.216```217~218Claude Code vygeneruje kompletni migraci:219~220```sql221-- Create enum types222CREATE TYPE task_status AS ENUM ('todo', 'in_progress', 'done');223CREATE TYPE task_priority AS ENUM ('low', 'medium', 'high');224~225-- Profiles table226CREATE TABLE profiles (227 id UUID REFERENCES auth.users ON DELETE CASCADE PRIMARY KEY,228 username TEXT UNIQUE,229 avatar_url TEXT,230 created_at TIMESTAMPTZ DEFAULT NOW()231);232~233-- Projects table234CREATE TABLE projects (235 id UUID DEFAULT gen_random_uuid() PRIMARY KEY,236 name TEXT NOT NULL,237 description TEXT,238 owner_id UUID REFERENCES profiles(id) ON DELETE CASCADE NOT NULL,239 created_at TIMESTAMPTZ DEFAULT NOW()240);241~242-- Tasks table243CREATE TABLE tasks (244 id UUID DEFAULT gen_random_uuid() PRIMARY KEY,245 title TEXT NOT NULL,246 description TEXT,247 status task_status DEFAULT 'todo',248 priority task_priority DEFAULT 'medium',249 project_id UUID REFERENCES projects(id) ON DELETE CASCADE NOT NULL,250 assigned_to UUID REFERENCES profiles(id),251 due_date TIMESTAMPTZ,252 created_at TIMESTAMPTZ DEFAULT NOW(),253 updated_at TIMESTAMPTZ DEFAULT NOW()254);255~256-- Enable RLS257ALTER TABLE profiles ENABLE ROW LEVEL SECURITY;258ALTER TABLE projects ENABLE ROW LEVEL SECURITY;259ALTER TABLE tasks ENABLE ROW LEVEL SECURITY;260~261-- Profiles policies262CREATE POLICY "Users can view own profile"263 ON profiles FOR SELECT USING (auth.uid() = id);264CREATE POLICY "Users can update own profile"265 ON profiles FOR UPDATE USING (auth.uid() = id);266~267-- Projects policies268CREATE POLICY "Users can view own projects"269 ON projects FOR SELECT USING (auth.uid() = owner_id);270CREATE POLICY "Users can create projects"271 ON projects FOR INSERT WITH CHECK (auth.uid() = owner_id);272CREATE POLICY "Users can update own projects"273 ON projects FOR UPDATE USING (auth.uid() = owner_id);274CREATE POLICY "Users can delete own projects"275 ON projects FOR DELETE USING (auth.uid() = owner_id);276~277-- Tasks policies278CREATE POLICY "Users can view tasks in their projects"279 ON tasks FOR SELECT USING (280 project_id IN (SELECT id FROM projects WHERE owner_id = auth.uid())281 );282CREATE POLICY "Users can create tasks in their projects"283 ON tasks FOR INSERT WITH CHECK (284 project_id IN (SELECT id FROM projects WHERE owner_id = auth.uid())285 );286CREATE POLICY "Users can update tasks in their projects"287 ON tasks FOR UPDATE USING (288 project_id IN (SELECT id FROM projects WHERE owner_id = auth.uid())289 );290CREATE POLICY "Users can delete tasks in their projects"291 ON tasks FOR DELETE USING (292 project_id IN (SELECT id FROM projects WHERE owner_id = auth.uid())293 );294```295~296Tuto migraci muzete spustit primo z panelu Supabase (SQL Editor) nebo pres CLI.297~298### Generovani TypeScript typu299~300```301You: Generate TypeScript types from the Supabase database and save them to src/types/database.ts302```303~304```bash305npx supabase gen types typescript --project-id YOUR_PROJECT_ID > src/types/database.ts306```307~308### Vytvoreni uzivatelskeho rozhrani309~310Nyni prichazi nejmocnejsi cast vibecoding. Dejte Claude Code vysokourovnove instrukce:311~312```313You: Create a dashboard page for the task management app with:314~3151. Sidebar with navigation between projects3162. Kanban view with 3 columns (Todo, In Progress, Done) with drag & drop3173. Modal to create/edit tasks3184. Header with user avatar and logout3195. Modern design with shadcn/ui and Tailwind320~321Use data from Supabase with React Server Components where possible322and Client Components only where interactivity is needed.323```324~325Claude Code postavi cele rozhrani, komponentu po komponente.326~327### Pridani autentizace328~329```330You: Add a complete authentication system with:331~3321. Login page with email/password and GitHub login3332. Registration page3343. Middleware to protect authenticated routes3354. Automatic redirect for unauthenticated users3365. Automatic profile creation after registration337```338~339Claude Code nakonfiguruje Next.js middleware a autentizacni stranky:340~341```typescript342// src/middleware.ts343import { createServerClient } from '@supabase/ssr';344import { NextResponse, type NextRequest } from 'next/server';345~346export async function middleware(request: NextRequest) {347 let supabaseResponse = NextResponse.next({ request });348~349 const supabase = createServerClient(350 process.env.NEXT_PUBLIC_SUPABASE_URL!,351 process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,352 {353 cookies: {354 getAll() {355 return request.cookies.getAll();356 },357 setAll(cookiesToSet) {358 cookiesToSet.forEach(({ name, value }) =>359 request.cookies.set(name, value)360 );361 supabaseResponse = NextResponse.next({ request });362 cookiesToSet.forEach(({ name, value, options }) =>363 supabaseResponse.cookies.set(name, value, options)364 );365 },366 },367 }368 );369~370 const { data: { user } } = await supabase.auth.getUser();371~372 if (!user && !request.nextUrl.pathname.startsWith('/auth')) {373 const url = request.nextUrl.clone();374 url.pathname = '/auth/login';375 return NextResponse.redirect(url);376 }377~378 return supabaseResponse;379}380~381export const config = {382 matcher: ['/((?!_next/static|_next/image|favicon.ico|auth).*)'],383};384```385~386## 5. Pokrocile vzory Vibecoding387~388### Iterativni prompting389~390Tajemstvim efektivniho vibecoding je **iterace**. Nesnazse se popsat vse v jednom promptu. Postupujte po krocich:391~392```393Krok 1: "Create the base layout with header and sidebar"394Krok 2: "Add the project list in the sidebar with a button to create new ones"395Krok 3: "Create the Kanban view in the main area"396Krok 4: "Add drag & drop between columns"397Krok 5: "Implement the modal to create new tasks"398Krok 6: "Add toast notifications for user feedback"399```400~401> **Tip:** Cim je prompt konkretnejsi a kontextualizovanejsi, tim lepsi vysledek. Claude Code ma pristup k cele kodove zakladne, takze muze nové funkce integrovat koherentne.402~403### Zpracovani chyb404~405Kdyz neco nefunguje (a stane se to), muzete jednoduše rici:406~407```408You: I'm getting this error in the console: "TypeError: Cannot read property409'map' of undefined" in the TaskList component. Fix it.410```411~412Claude Code analyzuje kod, identifikuje problem a opravi ho.413~414### Refaktoring s AI415~416```417You: The Dashboard component has become too large. Split it into smaller,418reusable components while maintaining the same functionality.419```420~421### Testovani422~423```424You: Add tests with Vitest for utility functions and Playwright tests for425the authentication and task creation flow.426```427~428## 6. Nasazeni na Vercel: Od kodu do sveta429~430### Krok 1: Push na GitHub431~432```433You: Create an appropriate .gitignore, commit everything, and push to a new434GitHub repository called "my-demo-app".435```436~437```bash438git add .439git commit -m "feat: complete task management demo"440gh repo create my-demo-app --public --push --source=.441```442~443### Krok 2: Pripojte Vercel444~4451. Jdete na [vercel.com](https://vercel.com) a kliknete na "Add New Project."4462. Importujte prave vytvoreny GitHub repozitar.4473. Pridejte promenne prostredi:448 - `NEXT_PUBLIC_SUPABASE_URL`449 - `NEXT_PUBLIC_SUPABASE_ANON_KEY`4504. Kliknete na "Deploy."451~452```mermaid453flowchart LR454 A[GitHub Push] --> B[Vercel Build]455 B --> C[Automatic Deploy]456 C --> D[Public URL]457 D --> E[Global CDN]458```459~460### Krok 3: Konfigurace vlastni domeny (Volitelne)461~462Vercel poskytuje bezplatnou URL jako `my-demo-app.vercel.app`. Pro vlastni domenu:463~464```465You: Add the configuration for a custom domain in vercel.json466```467~468### Nahledove nasazeni469~470Pokazde, kdyz otevrece Pull Request na GitHubu, Vercel automaticky vytvori **nahledove nasazeni** s unikatni URL. Idealni pro ukazani zmen pred mergem.471~472## 7. Optimalizace pro vase demo473~474### Vykon475~476```477You: Optimize the app's performance:4781. Add loading states with Suspense and skeletons4792. Implement caching with Next.js unstable_cache4803. Optimize images with next/image4814. Add SEO metadata for each page482```483~484### Realtime se Supabase485~486Funkce, ktera v demech vzdy zaujme, je **realtime**:487~488```489You: Add realtime synchronization for tasks using Supabase Realtime.490When a user updates a task, all other users should see the change491in real time without refreshing.492```493~494```typescript495'use client';496~497import { useEffect, useState } from 'react';498import { createClient } from '@/lib/supabase/client';499import type { Task } from '@/types/database';500~501export function useRealtimeTasks(projectId: string) {502 const [tasks, setTasks] = useState<Task[]>([]);503 const supabase = createClient();504~505 useEffect(() => {506 const channel = supabase507 .channel('tasks-changes')508 .on(509 'postgres_changes',510 {511 event: '*',512 schema: 'public',513 table: 'tasks',514 filter: `project_id=eq.${projectId}`,515 },516 (payload) => {517 if (payload.eventType === 'INSERT') {518 setTasks((prev) => [...prev, payload.new as Task]);519 } else if (payload.eventType === 'UPDATE') {520 setTasks((prev) =>521 prev.map((t) =>522 t.id === payload.new.id ? (payload.new as Task) : t523 )524 );525 } else if (payload.eventType === 'DELETE') {526 setTasks((prev) =>527 prev.filter((t) => t.id !== payload.old.id)528 );529 }530 }531 )532 .subscribe();533~534 return () => {535 supabase.removeChannel(channel);536 };537 }, [projectId, supabase]);538~539 return tasks;540}541```542~543### Tmavy rezim544~545```546You: Add dark mode support with a toggle in the header.547Use Tailwind dark classes and save the preference in localStorage.548```549~550## 8. Osvedcene postupy pro efektivni Vibecoding551~552### 1. Budte ve svych promptech konkretni553~554```555❌ "Make a nice page"556✅ "Create a landing page with a hero section with a purple-blue gradient,557 a features section with 3 cards with icons, and an orange CTA button"558```559~560### 2. Poskytnete kontext561~562```563❌ "Add authentication"564✅ "Add authentication with Supabase Auth. The project uses Next.js 15 App565 Router with TypeScript. I want email/password login and OAuth with GitHub.566 Use the SSR pattern with @supabase/ssr"567```568~569### 3. Iterujte v malych krocich570~571Nesnazte se postavit vse v jednom promptu. Postupujte inkrementalne:572~5731. Zakladni rozlozeni5742. Jedna funkce najednou5753. Stylizace a doladeni5764. Zpracovani chyb5775. Testovani578~579### 4. Kontrolujte vygenerovany kod580~581Vibecoding neznamena necist kod. Vzdy kontrolujte:582~583- **Bezpecnost**: politiky RLS, validace vstupu, sanitizace dat.584- **Vykon**: dotazy N+1, zbytecne klientske komponenty.585- **Osvedcene postupy**: struktura projektu, konvence pojmenovani.586~587### 5. Pouzivejte Git strategicky588~589```590You: Commit the changes with a descriptive message after each completed feature.591```592~593To vam umozni se vratit, pokud neco pojde spatne.594~595## 9. Naklady: Je to opravdu vse zdarma?596~597Zde je rozpad nakladu pro kazdou sluzbu:598~599| Sluzba | Bezplatny plan | Kdy platite |600|---------|-----------|-------------|601| **Claude Code** | Vyzaduje plan Anthropic (od $20/mesic) nebo API klic | Okamzite, ale hodnota je enormni |602| **Supabase** | Stedry bezplatny plan (2 projekty, 500MB DB) | Za hranicemi bezplatneho limitu |603| **Vercel** | Bezplatny plan pro osobni projekty | Pro tymy nebo komercni pouziti |604| **GitHub** | Zdarma pro verejne i soukrome repozitare | Podnikove funkce |605~606> **Poznamka:** Claude Code vyzaduje predplatne nebo API kredity, ale navratnost investice z hlediska rychlosti vyvoje je mimoradna. Pro demo nebo MVP je celkovy naklad v rozmezi $20.607~608### Bezplatne alternativy AI609~610Pokud chcete udrzet naklady na absolutni nule, muzete pouzit:611~612- **Cursor** (bezplatna uroven s omezenimi).613- **GitHub Copilot** (zdarma pro studenty a open source).614- **Codeium/Windsurf** (stedra bezplatna uroven).615~616## 10. Od dema k produktu: Dalsi kroky617~618Jakmile je vase demo zive, zde je jak pokracovat:619~620```mermaid621flowchart TD622 A[Live Demo] --> B{User Feedback}623 B --> C[Product Iteration]624 C --> D[Product-Market Fit]625 D --> E[Scaling]626 E --> F[Supabase Pro Plan]627 E --> G[Vercel Pro Plan]628 E --> H[Custom Domain]629```630~6311. **Sbirejte zpetnou vazbu**: sdiltte demo s potencialnimi uzivateli a sbirejte nazory.6322. **Rychle iterujte**: pouzijte vibecoding k implementaci pozadovanych zmen.6333. **Monitorujte metriky**: Vercel Analytics a Supabase Dashboard vam poskytuji zasadni data.6344. **Skalujte, kdyz je to potreba**: prejdete na placene plany az kdyz jste overili poptavku.635~636~637## Zaver638~639Vibecoding s Claude Code, Supabase a Vercel predstavuje mocnou kombinaci pro stavbu dem a MVP v rekordnim case. Co drive trvalo tydny vyvoje, lze nyni zvladnout za pouhych par hodin s prekvapive vysokou urovni kvality.640~641Klicem je pristupovat k vibecoding se spravnym nastavenim mysli: nejde o to "neumet programovat", ale o **zesilovani vasich schopnosti** pomoci AI nastroju. Cim vice vite o zakladnich technologiich (React, SQL, autentizace, nasazeni), tim efektivneji budete ridit AI agenta smerem k pozadovanemu vysledku.642~643Budoucnost vyvoje softwaru je tady a naklady na zacatek nebyly nikdy nizsi. Vytvorte sve demo, overte ho s realnymi uzivateli a postavte dalsi skvely produkt.644~645> **Kontrolni seznam pro vase prvni demo:**646>647> - [x] Claude Code nainstalovany a nakonfigurovany648> - [x] Supabase projekt vytvoren s databazovym schematem649> - [x] Next.js projekt inicializovan s shadcn/ui650> - [x] Autentizace nakonfigurovana651> - [x] Plny CRUD implementovan652> - [x] Moderni a responzivni UI653> - [x] Nasazeno na Vercel654> - [x] Sdilitelna URL pripravena pro zpetnou vazbu655~
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