• 🚀 Batch Validation - Validate multiple API keys simultaneously with configurable concurrency
• 📊 Real-time Progress - Streaming updates with live progress tracking
• 💰 Balance Checking - Automatic balance detection for supported providers
• 🌍 Multi-language Support - Available in 20+ languages including English, Chinese, Japanese, Spanish, and more
• 🎨 Modern UI - Beautiful glassmorphism design with dark/light mode support
• 🔒 Privacy First - All validations run in your browser/server, keys are never stored or logged
• ⚡ Multiple Providers - Support for 10+ LLM providers and OpenAI-compatible APIs

• Node.js 20+ or pnpm
• npm, yarn, or pnpm package manager

1. Clone the repository:

git clone https://github.com/Selenium39/llm-api-key-checker-next.git
cd llm-api-key-checker-next

2. Install dependencies:

npm install
# or
pnpm install
# or
yarn install

3. Run the development server:

npm run dev
# or
pnpm dev
# or
yarn dev

4. Open http://localhost:3000 in your browser

1. Select Provider: Choose from the dropdown list of supported LLM providers
2. Configure Settings:
   • Base URL (customize for compatible endpoints)
   • Model name
   • Concurrency level (1-50)
   • Validation prompt
   • Low balance threshold
3. Add API Keys: Paste your keys (separated by space, newline, comma, or semicolon)
4. Start Validation: Click "Start" to begin batch validation
5. View Results: Real-time results with status, balance (if supported), and error messages

• Framework: Next.js 16 with App Router
• Language: TypeScript
• Styling: Tailwind CSS 4
• i18n: next-intl
• Virtualization: @tanstack/react-virtual
• React: React 19

The app supports the following languages:

• 🇺🇸 English
• 🇨🇳 简体中文 (Simplified Chinese)
• 🇹🇼 繁體中文 (Traditional Chinese)
• 🇯🇵 日本語 (Japanese)
• 🇰🇷 한국어 (Korean)
• 🇪🇸 Español (Spanish)
• 🇫🇷 Français (French)
• 🇩🇪 Deutsch (German)
• 🇮🇹 Italiano (Italian)
• 🇷🇺 Русский (Russian)
• 🇵🇱 Polski (Polish)
• 🇳🇱 Nederlands (Dutch)
• 🇵🇹 Português (Portuguese)
• 🇹🇷 Türkçe (Turkish)
• 🇸🇦 العربية (Arabic)
• 🇮🇳 हिन्दी (Hindi)
• 🇮🇩 Bahasa Indonesia (Indonesian)
• 🇲🇾 Bahasa Melayu (Malay)
• 🇹🇭 ไทย (Thai)
• 🇻🇳 Tiếng Việt (Vietnamese)

• ✅ No API keys are stored in databases
• ✅ No logging of sensitive information
• ✅ Validation happens client-side and server-side (streaming)
• ✅ Open-source and auditable

Validates API keys with streaming responses.

Request Body:

{
  "provider": "openai",
  "baseUrl": "https://api.openai.com/v1",
  "model": "gpt-4o-mini",
  "keys": ["sk-..."],
  "concurrency": 10,
  "validationPrompt": "Hi",
  "lowThreshold": 1
}

Fetches available models for a given provider and API key.

Request Body:

{
  "provider": "openai",
  "baseUrl": "https://api.openai.com/v1",
  "keys": ["sk-..."]
}

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

This project is open source and available under the MIT License.

This project is proudly sponsored by ChatTempMail - a free temporary email service with AI integration.

• Thanks to all contributors
• Built with modern web technologies
• Inspired by the need for efficient API key management

• GitHub: @Selenium39
• Project Link: https://github.com/Selenium39/llm-api-key-checker-next
• Live Demo: https://check.chat-tempmail.com