LLM API Integration — Connect Any LLM to Your Application

I will integrate a large language model API into your application — covering authentication setup, request/response handling, streaming response implementation, token budget management, error handling with retry logic, and a secure backend proxy preventing API key exposure. LLM API integrations that call the provider directly from frontend JavaScript expose your API key to every user who inspects network traffic, have no rate limiting or cost controls, and cannot log usage for monitoring — a properly engineered backend proxy integration solves all three problems.

The integration covers backend proxy endpoint development, LLM provider SDK integration (OpenAI, Anthropic, Google, or your choice), streaming response support, token count tracking, error handling with exponential backoff, and basic usage logging.