> ## Documentation Index > Fetch the complete documentation index at: https://zarna.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # API Routers Overview > Complete overview of all 25+ FastAPI routers ## Overview The Zarna backend is organized into **25+ routers**, each handling a specific domain of functionality. **Location**: `api/app/routers/` ## Router Organization ### CRM Routers Company CRUD, search, analytics Contact management and relationships Deal pipeline and forecasting Meetings, calls, email tracking Financial records and metrics Notes and observations ### File Management Routers File upload, processing, extraction Google Drive integration SharePoint integration Egnyte file management Basecamp project integration ### Communication Routers Email tracking and history Automated email handling Google Calendar integration ### AI & Analytics Routers AI-powered report generation AI company sourcing with Exa Multi-agent chat system AI prompt operations ### Management Routers User management Firm management Team staffing and workload Utility endpoints Chat conversation history Meeting analysis and export ## Router Structure ### Standard Pattern ```python theme={null} from fastapi import APIRouter, Depends, HTTPException from pydantic import BaseModel from typing import List, Optional router = APIRouter( prefix="/api/companies", tags=["CRM: Companies"] ) class CompanyCreate(BaseModel): name: str industry: Optional[str] = None class CompanyResponse(BaseModel): id: str name: str industry: Optional[str] @router.get("/", response_model=List[CompanyResponse]) async def list_companies(): """List all companies""" pass @router.post("/", response_model=CompanyResponse, status_code=201) async def create_company(company: CompanyCreate): """Create new company""" pass @router.get("/{company_id}", response_model=CompanyResponse) async def get_company(company_id: str): """Get company by ID""" pass @router.patch("/{company_id}", response_model=CompanyResponse) async def update_company(company_id: str, company: CompanyUpdate): """Update company""" pass @router.delete("/{company_id}", status_code=204) async def delete_company(company_id: str): """Delete company""" pass ``` ## Router Registration ### Main Application ```python theme={null} # api/app/main.py from fastapi import FastAPI from app.routers import ( companies, contacts, deals, files, reports, email_bot, calendar, drive, agentic_chat ) app = FastAPI(title="Zarna API") # Register routers app.include_router(companies.router) app.include_router(contacts.router) app.include_router(deals.router) app.include_router(files.router) # ... 20+ more routers ``` ## OpenAPI Tags Routers are organized with tags for documentation: ```python theme={null} openapi_tags = [ {"name": "CRM: Companies", "description": "Company management"}, {"name": "CRM: Contacts", "description": "Contact management"}, {"name": "CRM: Deals", "description": "Deal pipeline"}, {"name": "CRM: Files", "description": "File operations"}, # ... more tags ] ``` ## Next Steps Explore all endpoints Backend architecture JWT middleware