The Problem

Every developer has been there: you build an API, it works great in development, and then it falls over the moment real traffic hits it. Load testing tools exist, but they are either too complex (JMeter, Gatling) or too simple (basic curl loops).

And then there is the webhook problem. You are integrating with a third-party service that sends webhooks, but you have no idea what payload they are actually sending. You set up ngrok, tail some logs, and hope for the best.

The Solution

LoadTest Pro combines both problems into one clean interface:

🚀 Load Testing

Define scenarios visually, run distributed tests, get real-time metrics

🔍 Webhook Inspector

Unique endpoints for each integration, full request logging, replay capability

📈 Real-time Analytics

Live charts showing response times, error rates, and throughput as tests run

🤖 Smart Assertions

Define expected behaviors and get alerted when things break

Technical Architecture

The platform is built for scale from day one:

Distributed Workers: Load generation happens across multiple nodes to simulate realistic traffic patterns
WebSocket Streaming: Results stream to the dashboard in real-time, no polling required
PostgreSQL + TimescaleDB: Time-series data for metrics, regular Postgres for everything else
Redis Pub/Sub: Coordinates workers and handles real-time event distribution

Current Status

Core load testing is functional. Currently building the webhook inspection features and polishing the UI. Beta launch planned for early 2025.

Lessons Learned

Building a load testing tool that is itself performant is a fun challenge. Early versions had the ironic problem of the dashboard becoming slow under heavy test loads. Fixed that with virtualized lists and smarter data aggregation.

Things I'm Building