Why DaloyJS Is the Best Backend (or BFF) for Your Electron App

If you've ever built an Electron app that needs a backend, you know the problem. You want something lightweight, something that runs on Node, something where you don't spend three hours configuring Swagger, and something that doesn't make you feel like you're setting up a microservices architecture just to expose two endpoints to your own desktop UI. I've shipped Electron apps with Express. I've tried Fastify. Both work, but they leave you doing a lot of plumbing yourself. Then I found DaloyJS , and honestly, it clicked. The Electron Backend Problem Here's the thing about Electron: your renderer process is basically a browser, and your main process is a Node.js server. When you need data from external APIs, or you need a clean layer between your UI and your business logic, you want a BFF, a Backend for Frontend. A thin server that composes upstream calls, holds the session, and returns exactly the shape your UI needs. DaloyJS was built for this role. The docs even say so plainly: typed upstream client, fetchGuard for safe egress, session handling, and edge runtime support. That combination is exactly the BFF toolkit. Contract-First Means Less Glue The killer feature for desktop apps is contract-first routing. You define a route once, and DaloyJS gives you validation, OpenAPI 3.1 docs, and a typed in-process client all from the same source. No stale spec files. No writing types by hand. Here's what a basic Electron BFF route looks like: import { z } from " zod " ; import { App , requestId , secureHeaders , rateLimit } from " @daloyjs/core " ; import { serve } from " @daloyjs/core/node " ; const app = new App ({ bodyLimitBytes : 1 << 20 , requestTimeoutMs : 5 _000 , docs : true , // auto-mounts /docs and /openapi.json }); app . use ( requestId ()); app . use ( secureHeaders ()); app . use ( rateLimit ({ windowMs : 60 _000 , max : 120 })); app . route ({ method : " GET " , path : " /settings/:userId " , operationId : " getUserSettings " , request : { params : z . objec