Examples

One runnable file for each thing fulmine.js does that Express does not, or does differently. What an Express app already does, routers, view engines, sessions, uploads, works unchanged and is documented by Express itself.

Use case	How
Keep a route on the fast path	express.testing.expectNative()
One process per core on one port	express({ cluster: "auto" })
A database pool per cluster worker	app.cluster.share(40)
WebSockets next to your Express routes	app.ws("/room/:id", { open, message })
socket.io on uWebSockets.js	io.attachApp(app.uwsApp)
An MCP server on Express	the official SDK, Streamable HTTP
Serve the .br and .gz files your build wrote	express.static(dir, { preCompressed: true })
Compression without the compression package	app.use(express.compression())
See how a request was routed in Server-Timing	app.use(express.serverTiming())
HTTPS without https.createServer	express({ uwsOptions })
Client IP behind HAProxy, AWS NLB, nginx or Envoy	app.set("trust proxy protocol", true)
Graceful shutdown	app.listen() answers as an http.Server
Trace requests with diagnostics_channel	express.router.request, http.server.*
Run on node:http, node:http2, Bun and Deno	http.createServer(app)
DELETE with a JSON body	app.set("body methods", ["DELETE"])
Move a project from Express	npx fulmine.js migrate
See what listen() decided	npx fulmine.js profile and explain

The files are in the examples directory of the repository.