k6

k6 is a developer centric, open source load testing tool, built to integrate with your Continuous Integration tools, so you can stay on top of performance without fuzz. Powered by Load Impact. k6 test scripts are written in ES6 JavaScript to allow creation of modular scripts. Create and share custom libraries with other members of the organization. k6 is command line driven with output to stdout or streamed to results analysis tools such as Load Impact Insights. k6 supports local execution on the developer's own machine. Start load testing early in the development cycle to find and fix performance issues at lowest cost.