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npx: Run Tools Without Installing

npx runs package binaries, downloading on demand if not installed.

npx is handy for one-off tools, but in CI an unpinned npx fetch is non-deterministic and a minor supply-chain risk.

Common usage

npx <pkg> [args] - run a CLI
npx --yes <pkg> - skip the install prompt
npx --no-install <cmd> - only use local
npx <pkg>@<version> - pin the version

Example in CI

Pin the version when fetching on demand.

shell

npx --yes prettier@3 --check .

In CI

Prefer npx --no-install so it uses the pinned devDependency, or pin pkg@version. Unpinned npx pkg resolves to latest at runtime.

Key takeaways

Pin pkg@version or use --no-install.
Unpinned npx resolves to latest at runtime.
--yes avoids the interactive prompt.

Related guides

npm exec: Run Package Binariesnpm exec runs a command from a local or remote package, the engine behind npx. Useful for one-off tools in CI. npm run: Execute package.json Scriptsnpm run executes scripts defined in package.json. Learn passing args, the -- separator, and exit-code behavio…

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