Source

WeBot

NestJS TypeScript Redis

WeBot

Overview

A WeChat customer support bot backend built with NestJS. Integrates with the WeChat API for automated conversation flows, with Redis-based semantic caching to avoid redundant Gemini API calls on similar queries.

Key Features

  • WeChat API Integration — Full webhook handling for incoming messages and event callbacks
  • Gemini AI Responses — Google Gemini for intelligent, context-aware reply generation
  • Redis Semantic Caching — Caches similar queries by semantic similarity, reducing API costs
  • NestJS Architecture — Modular, testable structure with dependency injection

Tech Stack

  • Backend: NestJS (TypeScript)
  • Cache: Redis (semantic caching)
  • AI: Google Gemini
  • Integration: WeChat Official Account API