Multiple – Load test any API with JavaScript and NPM packages
Hey HN, I wanted a better load testing solution – so I built one with my team at Multiple. We just opened early access and would love to get your feedback. We created Multiple to solve three challenges with existing tools: 1. Limited scripting capabilities. XML or GUI-based scripting can only test basic scenarios. Existing code-based tools struggle with auth, generating synthetic data, and testing anything other than HTTP requests. We went with JavaScript for ease of use, versatility, and integration with existing developer workflows. 2. Cannot use existing libraries or code. Instead of…
In plain words
Multiple is a load testing tool that uses JavaScript and NPM packages to test APIs and services. It lets developers write test scripts in JavaScript rather than XML or proprietary languages, and reuse existing code and libraries from the NPM ecosystem. The tool handles complex scenarios like authentication and synthetic data generation, and can test various protocols beyond just HTTP requests. It's designed for developers who want to avoid learning new scripting systems and tedious infrastructure setup.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN, I wanted a better load testing solution – so I built one with my team at Multiple. We just opened early access and would love to get your feedback. We created Multiple to solve three challenges with existing tools: 1. Limited scripting capabilities. XML or GUI-based scripting can only test basic scenarios. Existing code-based tools struggle with auth, generating synthetic data, and testing anything other than HTTP requests. We went with JavaScript for ease of use, versatility, and integration with existing developer workflows. 2. Cannot use existing libraries or code. Instead of forcing you to learn a new system and rewrite code, Multiple leverages the JavaScript and NPM ecosystem so you can use packages you're already familiar with. By supporting NPM packages, Multiple can test nearly any API, service, or protocol. 3. Tedious infrastructure management. There's no reason to spend time spinning up and configuring machines, and then destroying them after a test. Multiple abstracts that away. You just enter the test size and duration, and press start. My favorite feature we've built so far is the Debug Run. You can use Debug Run as you write your tests to execute a single run-through. It's helpful to verify correct behavior and capture logs, and it allows you to iterate quickly, without spinning up a full load test each time. We have so much in store for developers: pass/fail conditions, CLI, and repo integration, to name a few. Thanks for reading, and let us know what you think.
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