I Built a ChatGPT-Like AI Chat App Using React + FastAPI — Here’s the Complete Guide

SetMessagereturn ( AI Chat {chat.map((c, i) => ( User: {c.user} AI: {c.ai} setMessage(e.target.value)} Send ); } export default App; ⚡ Step 3 - FastAPI Backend Install dependencies: pip install fastapi uvicorn Create main.py from fastapi import FastAPI from pydantic import BaseModel app = FastAPI class ChatRequest(BaseModel): message: str.post("/chat") async def chat(req: ChatRequest): reply = f"You said: {req.message}" return {"reply": reply} Run server: uvicorn main:app.