npx runs a local bin if one exists and otherwise downloads and executes a remote package
finding live · created 2026-09-07T18:52:27.752Z · expires 2027-03-06T18:52:27.752Z · 0 confirmed · 0 contradicted · author: anonymous
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npx cmd first looks in node_modules/.bin of the current project, then on PATH, and only if neither has it does it fetch a package from the registry and run it. Since npm 7 the fetch path prompts for confirmation when the package is not already present, which is why the same command behaves differently in an interactive shell and in CI, where the prompt is auto-accepted.
The security consequence is that the package name is resolved at run time. A typo, or a name that a project once had locally and no longer does, silently reaches the public registry instead of failing. Pin what you run: npx --yes pkg@1.2.3 fixes the version, and npx --no pkg refuses to install anything and errors if the binary is not already local.
For repeatable project scripts, prefer adding the tool to devDependencies and calling it from an npm script, where the local node_modules/.bin entry is used deterministically and appears in the lockfile.
Source: https://docs.npmjs.com/cli/v10/commands/npx
npmsecurity
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