structured JSON logs

Dockerfile

@@ -9,6 +9,8 @@ RUN yarn build
 FROM node:22-slim
 RUN apt-get update && apt-get install -y curl
 WORKDIR /app
-RUN yarn add serve
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile --production
 COPY --from=builder /app/dist ./dist
-CMD ["yarn", "serve", "-s", "dist", "-l", "3000"]
+COPY server.mjs .
+CMD ["node", "server.mjs"]

package.json

@@ -8,6 +8,7 @@
     "build": "tsc -b && vite build",
     "lint": "eslint .",
     "preview": "vite preview",
+    "start": "node server.mjs",
     "openapi-ts": "openapi-ts",
     "prettier": "prettier",
     "test": "output=$(vitest run 2>&1) || { printf '%s\\n' \"$output\"; exit 1; }",
@@ -27,7 +28,7 @@
     "react-icons": "^5.5.0",
     "react-markdown": "^10.1.0",
     "react-router-dom": "^7.2.0",
-    "serve": "^14.2.4",
+    "serve-handler": "^6.1.6",
     "tailwindcss": "^4.0.9",
     "uplot": "^1.6.32"
   },

server.mjs

@@ -0,0 +1,63 @@
+import http from "node:http";
+import { performance } from "node:perf_hooks";
+import process from "node:process";
+import handler from "serve-handler";
+
+const port = Number(process.env.PORT) || 3000;
+
+function log(level, msg, fields = {}) {
+  process.stdout.write(
+    `${JSON.stringify({ ts: new Date().toISOString(), level, msg, ...fields })}\n`,
+  );
+}
+
+function clientIp(req) {
+  const forwarded = req.headers["x-forwarded-for"];
+  if (typeof forwarded === "string" && forwarded.length > 0) {
+    return forwarded.split(",")[0].trim();
+  }
+  if (Array.isArray(forwarded) && forwarded.length > 0) {
+    return forwarded[0].split(",")[0].trim();
+  }
+  return req.socket.remoteAddress ?? undefined;
+}
+
+const server = http.createServer(async (req, res) => {
+  const started = performance.now();
+
+  res.on("finish", () => {
+    log("info", "request", {
+      method: req.method,
+      url: req.url,
+      status: res.statusCode,
+      duration_ms: Math.round(performance.now() - started),
+      ip: clientIp(req),
+    });
+  });
+
+  try {
+    await handler(req, res, {
+      public: "dist",
+      rewrites: [{ source: "**", destination: "/index.html" }],
+    });
+  } catch (err) {
+    log("error", "request_handler_failed", {
+      method: req.method,
+      url: req.url,
+      ip: clientIp(req),
+      err: err instanceof Error ? err.message : String(err),
+    });
+    if (!res.headersSent) {
+      res.writeHead(500, { "Content-Type": "text/plain" });
+      res.end("Internal Server Error");
+    }
+  }
+});
+
+server.on("error", (err) => {
+  log("error", "server_error", { err: err.message });
+});
+
+server.listen(port, () => {
+  log("info", "listening", { port });
+});