# NextEVI Documentation ## Docs - [Error Reference](https://docs.nextevi.com/api-reference/errors.md): Complete reference for NextEVI API error codes, causes, and solutions - [WebSocket API Reference](https://docs.nextevi.com/api-reference/websocket.md): Complete API reference for NextEVI WebSocket voice communication - [NextEVI: Voice AI Platform](https://docs.nextevi.com/index.md): Build intelligent voice applications with NextEVI's powerful real-time voice AI platform - [Quickstart](https://docs.nextevi.com/quickstart.md): Start building awesome documentation in minutes - [Authentication](https://docs.nextevi.com/speech-to-speech/authentication.md): Secure authentication methods for NextEVI Speech-to-Speech API - [Examples & Use Cases](https://docs.nextevi.com/speech-to-speech/examples.md): Complete working examples and real-world use cases for NextEVI's voice AI - [Emotion Recognition](https://docs.nextevi.com/speech-to-speech/features/emotions.md): Real-time emotion detection and empathic AI responses in NextEVI - [Turn Detection & Interruption Handling](https://docs.nextevi.com/speech-to-speech/features/turn-detection.md): Advanced conversation flow management with intelligent turn detection and interruption handling - [LiveKit Integration Installation](https://docs.nextevi.com/speech-to-speech/livekit-integration/installation.md): Install and set up NextEVI with LiveKit Agents for real-time voice applications - [LiveKit Integration Quick Start](https://docs.nextevi.com/speech-to-speech/livekit-integration/quickstart.md): Build a complete NextEVI voice agent with LiveKit in minutes - [Speech-to-Speech Overview](https://docs.nextevi.com/speech-to-speech/overview.md): NextEVI's Empathic Voice Interface - Real-time conversational AI with emotion recognition - [React Hooks Reference](https://docs.nextevi.com/speech-to-speech/react-sdk/hooks.md): Complete reference for NextEVI React SDK hooks - [Installation & Quick Start](https://docs.nextevi.com/speech-to-speech/react-sdk/installation.md): Get started with NextEVI's React SDK in minutes - [WebSocket Connection](https://docs.nextevi.com/speech-to-speech/websocket-api/connection.md): Connect to NextEVI's WebSocket API for real-time voice communication - [WebSocket Examples](https://docs.nextevi.com/speech-to-speech/websocket-api/examples.md): Complete working examples for NextEVI WebSocket API integration - [WebSocket Protocol](https://docs.nextevi.com/speech-to-speech/websocket-api/protocol.md): Complete WebSocket message protocol for NextEVI voice communication