APIs, JSON and Pydantic

Flow

App → POST JSON → LLM → JSON back → validate → act.

import requests
from pydantic import BaseModel

class Ticket(BaseModel):
    title: str
    priority: str  # low|high

r = requests.post("https://api.example.com/chat",
  json={"messages": [{"role":"user","content":"hi"}]},
  headers={"Authorization": "Bearer $KEY"}, timeout=30)
data = Ticket.model_validate(r.json())  # throws if bad

Always: timeouts, retries with backoff, log status codes, never ship keys in frontend.