> ## Documentation Index
> Fetch the complete documentation index at: https://docs.drpn.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# API overview

> Current JSON-RPC integration surface for Darpan backend calls.

Darpan backend calls use Moqui JSON-RPC services through `/rpc/json`.

All calls use `POST /rpc/json` with a JSON-RPC 2.0 envelope, authenticated by session cookie for the browser app or the `login_key` header for integration callers — see [JSON-RPC transport](/api-reference/json-rpc) for the authentication channels, plus the full request, response, and error shapes.

Darpan uses JSON-RPC service methods rather than separate REST resources for the current backend integration surface. The OpenAPI file in this repo captures the shared transport shape; individual service contracts come from verified backend facade services. For the per-operation specification, see the **Generated reference** group in the API reference navigation — it is generated from the OpenAPI file in this repo.

For the current backend organization, see [Service layer](/backend/service-layer).