Tools Benchmarking and runtime analysis Build tools and task runners Single executables Code editors and IDEs Code sandboxes/playgrounds/REPLs Compilers/transpilers and parsers Runtime transpilers and module loaders Development lifecycle automation Documentation generators Dummy/fake data generation Hot JS module reloading Module systems (legacy) Package managers Package registries and hosting Runtime version managers Runtime process managers Script runners Static analysis and linting Testing frameworks Workspace management (monorepos) Dependency analysis File watching and hot reloading