npm exec -- <pkg>[@<version>] [args...] npm exec --package=<pkg>[@<version>] -- <cmd> [args...] npm exec -c '<cmd> [args...]' npm exec --package=foo -c '<cmd> [args...]' npx <pkg>[@<specifier>] [args...] npx -p <pkg>[@<specifier>] <cmd> [args...] npx -c '<cmd> [args...]' npx -p <pkg>[@<specifier>] -c '<cmd> [args...]' alias: npm x, npx --package=<pkg> (may be specified multiple times) -p is a shorthand for --package only when using npx executable -c <cmd> --call=<cmd> (may not be mixed with positional arguments)
This command allows you to run an arbitrary command from an npm package (either one installed locally, or fetched remotely), in a similar context as running it via
Whatever packages are specified by the
--package option will be provided in the
PATH of the executed command, along with any locally installed package executables. The
--package option may be specified multiple times, to execute the supplied command in an environment where all specified packages are available.
If any requested packages are not present in the local project dependencies, then they are installed to a folder in the npm cache, which is added to the
PATH environment variable in the executed process. A prompt is printed (which can be suppressed by providing either
Package names provided without a specifier will be matched with whatever version exists in the local project. Package names with a specifier will only be considered a match if they have the exact same name and version as the local dependency.
--call option is provided, then the positional arguments are used to generate the command string. If no
--package options are provided, then npm will attempt to determine the executable name from the package specifier provided as the first positional argument according to the following heuristic:
package.json, or if all entries are aliases of the same command, then that command will be used.
binentries, and one of them matches the unscoped portion of the
namefield, then that command will be used.
nameof the package), then
npm execexits with an error.
To run a binary other than the named binary, specify one or more
--package options, which will prevent npm from inferring the package from the first command argument.
When run via the
npx binary, all flags and options must be set prior to any positional arguments. When run via
npm exec, a double-hyphen
-- flag can be used to suppress npm's parsing of switches and options that should be sent to the executed command.
In this case, npm will resolve the
foo package name, and run the following command:
$ foo bar [email protected]/foo
--package option comes after the positional arguments, it is treated as an argument to the executed command.
In contrast, due to npm's argument parsing logic, running this command is different:
In this case, npm will parse the
--package option first, resolving the
@npmcli/foo package. Then, it will execute the following command in that context:
$ [email protected] bar
The double-hyphen character is recommended to explicitly tell npm to stop parsing command line options and switches. The following command would thus be equivalent to the
npx command above:
Run the version of
tap in the local dependencies, with the provided arguments:
$ npm exec -- tap --bail test/foo.js $ npx tap --bail test/foo.js
Run a command other than the command whose name matches the package name by specifying a
$ npm exec --package=foo -- bar --bar-argument # ~ or ~ $ npx --package=foo bar --bar-argument
Run an arbitrary shell script, in the context of the current project:
$ npm x -c 'eslint && say "hooray, lint passed"' $ npx -c 'eslint && say "hooray, lint passed"'
npx binary was rewritten in npm v7.0.0, and the standalone
npx package deprecated at that time.
npx uses the
npm exec command instead of a separate argument parser and install process, with some affordances to maintain backwards compatibility with the arguments it accepted in previous versions.
This resulted in some shifts in its functionality:
npmconfig value may be provided.
npxprompts before installing anything. Suppress this prompt with the
--no-installoption is deprecated, and will be converted to
-pargument is a shorthand for
--parseablein npm, but shorthand for
--packagein npx. This is maintained, but only for the
--ignore-existingoption is removed. Locally installed bins are always present in the executed process
--npmoption is removed.
npxwill always use the
npmit ships with.
-noptions are removed.
--always-spawnoption is redundant, and thus removed.
--shelloption is replaced with
--script-shell, but maintained in the
npxexecutable for backwards compatibility.
© npm, Inc. and Contributors
Licensed under the npm License.
npm is a trademark of npm, Inc.