I Built an AI Auto-Dubbing Web App Using Claude Code 🎙️ (For the first time!!!)

Chanyeong Yun — Wed, 25 Mar 2026 07:24:59 +0000

Hey devs! I recently shipped an AI-powered auto-dubbing web service built almost entirely with the help of coding agents (Claude Code + Google Gemini), and I wanted to share what I learned along the way.

https://github.com/user-attachments/assets/e77a38d9-8ecb-4010-aff0-bfc8d9d80cf3

🐙 GitHub: https://github.com/edwardyun12/ai-dubbing-web-app

📌 What Does It Do?
Upload any audio or video file → get it dubbed in your target language automatically.
Here's the full pipeline:
Upload file → transcribe speech via ElevenLabs API
Transcription → translate with Google Translate API
Pick an AI voice for the target language (male/female, calm/energetic, etc.)
Synthesize dubbed audio with ElevenLabs TTS

Play back and download the result

🛠️ Tech Stack
Category Technology
Framework Next.js (TypeScript)
Deployment Vercel
Database Turso
Voice API ElevenLabs
Translation Google Translate API
Auth Google OAuth (NextAuth)

Dev Agents Claude Code, Google Gemini

🤖 How Claude Code Actually Helped (Honestly)
The hardest parts weren't the features themselves — they were the architecture decisions and debugging.
Here's where Claude Code made a real difference:
NextAuth + Turso DB integration
The auth logic was surprisingly complex. Once I gave Claude a clear spec of the input/output I needed, it generated accurate, working code on the first try.
Next.js Suspense errors
I kept hitting client component boundary issues. Pasting the raw error log into Claude immediately surfaced the root cause and the fix.
Env variable security
Claude proactively flagged a .env.local mistake before it became a problem.

I also used Google Gemini (AntiGravity) for fine-grained debugging and documentation, then cross-validated between the two agents to boost code stability.

💡 Tips for Working With Coding Agents
After building this project, here's what actually works:

Be specific about I/O Instead of "make a dubbing function," say "write a function that takes a File input and returns a translated audio Blob." Precision = better output.
Break it into small units Asking for everything at once creates tangled logic. Feature-by-feature requests consistently produce cleaner results.
Paste error logs raw Don't summarize. Just paste the full stack trace. The agent picks up on details you might miss.
Always review before you commit Treat agent code like a junior dev's PR. Read it, understand it, then ship it. > 💡 The process of collaborating with agents to solve problems matters more than the polish of the final code. --- ⚙️ Want to Run It Locally? Prerequisites You'll need API keys from: Service Purpose ElevenLabs Speech transcription & synthesis Turso Database Google Cloud OAuth + Translate API Vercel Deployment Steps

git clone https://github.com/edwardyun12/ai-dubbing-web-app.git
cd ai-dubbing-web-app

Create a .env.local file:

ELEVENLABS_API_KEY=your_elevenlabs_api_key
TURSO_DATABASE_URL=your_turso_database_url
TURSO_AUTH_TOKEN=your_turso_auth_token
GOOGLE_CLIENT_ID=your_google_client_id
GOOGLE_CLIENT_SECRET=your_google_client_secret
NEXTAUTH_SECRET=your_nextauth_secret
NEXTAUTH_URL=http://localhost:3000

Then:

npm install
npm run dev

Open http://localhost:3000 and you're good to go!