routepulse

Zero-config Express.js middleware to automatically monitor, log, and analyze slow API routes in real-time.

Stop guessing which route is bottlenecking your app. routepulse acts as a high-precision stopwatch for your Express API, alerting you instantly in the terminal when a database query or endpoint takes too long.

Perfect for local development debugging and lightweight production monitoring.

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Installation

npm install routepulse

(Also supports yarn add routepulse and pnpm add routepulse)

Quick Start

Drop it into your Express app right after your body parsers, but before your routes.

ES Modules (import)

import express from "express";
import analyzer from "routepulse";

const app = express();
app.use(express.json());

// 1. Initialize the monitor (Warns if a route takes > 500ms)
app.use(analyzer.monitor({ slowThreshold: 500 }));

// 2. Your routes
app.get("/api/users", (req, res) => {
  res.json({ message: "This route is lightning fast!" });
});

app.listen(3000, () => console.log("Server running on port 3000"));

CommonJS (require)

const express = require("express");
const analyzer = require("routepulse");

const app = express();
app.use(express.json());
app.use(analyzer.monitor({ slowThreshold: 500 }));

Features

• Zero-Config Setup: No complex cloud dashboards, account sign-ups, or heavy agents to install.
• The "Slow-Log" Alert: Instantly prints a bright red warning in your terminal if a route crosses your millisecond threshold.
• Smart Route Grouping: Automatically merges dynamic routes (e.g., /api/users/123, /api/products/uuid, or /api/orders/mongoId all safely become /api/.../:id) to prevent memory leaks in production.
• High-Precision Timing: Uses Node's native process.hrtime() for nanosecond-level accuracy, immune to system clock drift.
• TypeScript Ready: Ships with built-in type declarations out of the box. No need to install @types/routepulse.

What happens when a route is slow?

If an endpoint exceeds your slowThreshold, routepulse catches it and prints a highly visible warning directly in your server console, including the exact query parameters that caused the slowdown:

🚨 SLOW ROUTE DETECTED
-> Route: POST /api/progress/mood
-> Time:  393.16ms (Threshold: 300ms)
-> Query: {"sort":"desc"}
-> Stats: Avg: 393.16ms | Max: 393.16ms

The Speed Dashboard

routepulse silently tracks your Max, Min, and Average response times in the background without polluting your console on fast routes.

At any point, navigate to the secret debug endpoint to view the live stats of your entire API:

http://localhost:3000/debug/speed

{
  "GET /api/users": {
    "hits": 42,
    "totalTimeMs": 1450.2,
    "avgTimeMs": 34.52,
    "maxTimeMs": 89.1,
    "minTimeMs": 12.4
  },
  "GET /api/users/:id": {
    "hits": 15,
    "totalTimeMs": 450.5,
    "avgTimeMs": 30.03,
    "maxTimeMs": 45.2,
    "minTimeMs": 28.1
  }
}

Configuration Options

Pass an options object into analyzer.monitor(options):

Option	Type	Default	Description
slowThreshold	number	500	The time in milliseconds before the terminal warning is triggered.

License

MIT © 2026