Multiple – Load test any API with JavaScript and NPM packages

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.…

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  Multiple2023 · ▲117

  Load Testing Built for Developers

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  Apidog2024 · apidog.com · ▲570

  Development teams often struggle with using multiple tools like Postman and Swagger for API design, development, and testing. This fragmented approach leads to outdated API specs and chaotic collaboration. So we built Apidog: a single, unified API platform for team collaboration. It has a beautiful interface that makes it easy to create API spec, generate request data from API spec, validate responses, create mock data, orchestrate test scenarios, and publish API documentation. Apidog = Postman + Swagger + Mock + JMeter.

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