NodeUIThe local-only developer console for Node.js

NodeUI shows what your running app is doing (requests, queries, errors, memory, logs). It is a developer console, not a UI component library. An embedded, zero-infrastructure dashboard for Express, Fastify, NestJS, Koa, Hapi, Hono and plain node:http.

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Embedded

A React UI and REST/SSE endpoints mounted inside your existing app. No extra servers, no cloud, no containers.

Local and secure

Loopback-only by default, automatic secret masking, and fail-closed in production.

Everything in one place

Requests, queries (with N+1 detection), errors, outgoing calls, logs, routes, memory, CPU, event-loop lag and heap snapshots.

Request correlation

Outgoing calls, queries and log lines are attributed to the request that caused them, shown as a per-request timeline.

Low overhead

Bounded ring buffers and samplers that sleep when idle. Use capture lazy for zero cost until you look.

Extensible

Add your own panels, export to OpenTelemetry, attach with no code changes, or let an AI agent read it over MCP.

Quick start

bash

npm install --save-dev @singhak/nodeui-express

typescript

import { nodeui } from '@singhak/nodeui-express';

const { middleware, server } = nodeui();
app.use(middleware); // before your routes
app.listen(3000, '127.0.0.1', () => server.mark('listening'));

Then open http://127.0.0.1:3000/nodeui.