How I Improved My Express API Performance (and Built a Toolkit for It)

Mayank Saini — Wed, 01 Apr 2026 05:26:27 +0000

When working on production APIs, performance is something you feel before you fully understand.

Slow responses.
Unclear bottlenecks.
No visibility into what's actually happening.

I ran into the same problem while working on an Express.js backend — and that’s what led me to build an open-source solution.

⚠️ The Problem

In a typical Express app, debugging performance isn’t straightforward.

You might ask:

Which API is slow?
Is it database time or middleware overhead?
How many requests are hitting my server?
Where is latency coming from?

The issue is:

Express doesn’t give you this visibility out of the box.

So we end up:

Adding random console.log
Writing custom timers
Or guessing based on intuition

None of these scales.

💡 The Idea

I wanted something simple:

A plug-and-play tool that shows real-time performance insights for Express apps.

No heavy setup.
No external services.
Just install → use → understand.

🛠️ What I Built

I created an open-source package:

👉 Express Performance Toolkit

It helps you:

Track API response times
Monitor request counts
Identify slow endpoints
Visualize performance via a dashboard
Webhook support

⚡ Quick Setup

Getting started takes less than a minute:

npm install express-performance-toolkit

import express from "express";
import performanceToolkit from "express-performance-toolkit";

const app = express();

app.use(performanceToolkit().middleware);

app.get("/", (req, res) => {
  res.send("Hello World");
});

app.listen(3000);

That’s it.

📊 What You Get

1. API Performance Tracking

You can see:

Response time per route
Average latency
Request frequency

2. Real-Time Insights

Instead of guessing, you now know:

Which route is slow
How your app behaves under load

3. Built-in Dashboard

A simple UI to visualise:

Requests
Performance trends
Endpoint-level metrics

🔥 Real Impact

After using this internally, I noticed:

Faster debugging of performance issues
Better understanding of API behavior
Reduced time spent on manual logging

Instead of reacting late, I could see issues early.

🧠 Key Learning

The biggest lesson wasn’t just about performance.

It was this:

Visibility is more important than optimisation.

You can’t fix what you can’t see.

🚀 Why I Open-Sourced It

I realised many developers face the same problem:

Early-stage apps lack monitoring
Full tools like Datadog or New Relic feel heavy

So I built something:

Lightweight
Developer-friendly
Easy to integrate

📦 Try It Out

If you work with Express.js, give it a try:

👉 https://www.npmjs.com/package/express-performance-toolkit

👉 https://github.com/Sainimayank1/express-performance-toolkit

👉 https://express-performance-toolkit.netlify.app/

🙌 Feedback

I’m actively improving this package.

If you:

Try it out
Have suggestions
Want new features

Feel free to open an issue or contribute.

🧩 What’s Next

I’m currently working on:

More advanced metrics
Better dashboard visualisation
Production-ready features

✨ Final Thought

Performance is not just about speed.

It’s about understanding your system.

And sometimes, a small tool can make a big difference.

If this helped you, feel free to share your thoughts 👇

Forem: Mayank Saini