Command Line Options

Node.js comes with a variety of CLI options. These options expose built-in debugging, multiple ways to execute scripts, and other helpful runtime options.

To view this documentation as a manual page in your terminal, run man node.

Synopsis

node [options] [v8 options] [script.js | -e "script"] [arguments]

node debug [script.js | -e "script" | <host>:<port>] …

node --v8-options

Execute without arguments to start the REPL.

For more info about node debug, please see the debugger documentation.

Options

-v, --version

Print node's version.

-h, --help

Print node command line options. The output of this option is less detailed than this document.

-e, --eval "script"

Evaluate the following argument as JavaScript.

-p, --print "script"

Identical to -e but prints the result.

-c, --check

Syntax check the script without executing.

-i, --interactive

Opens the REPL even if stdin does not appear to be a terminal.

-r, --require module

Preload the specified module at startup.

Follows require()'s module resolution rules. module may be either a path to a file, or a node module name.

--no-deprecation

Silence deprecation warnings.

--trace-deprecation

Print stack traces for deprecations.

--throw-deprecation

Throw errors for deprecations.

--trace-sync-io

Prints a stack trace whenever synchronous I/O is detected after the first turn of the event loop.

--zero-fill-buffers

Automatically zero-fills all newly allocated Buffer and SlowBuffer instances.

--track-heap-objects

Track heap object allocations for heap snapshots.

--prof-process

Process v8 profiler output generated using the v8 option --prof.

--v8-options

Print v8 command line options.

--tls-cipher-list=list

Specify an alternative default TLS cipher list. (Requires Node.js to be built with crypto support. (Default))

--enable-fips

Enable FIPS-compliant crypto at startup. (Requires Node.js to be built with ./configure --openssl-fips)

--force-fips

Force FIPS-compliant crypto on startup. (Cannot be disabled from script code.) (Same requirements as --enable-fips)

--icu-data-dir=file

Specify ICU data load path. (overrides NODE_ICU_DATA)

Environment Variables

NODE_DEBUG=module[,…]

','-separated list of core modules that should print debug information.

NODE_PATH=path[:…]

':'-separated list of directories prefixed to the module search path.

Note: on Windows, this is a ';'-separated list instead.

NODE_DISABLE_COLORS=1

When set to 1 colors will not be used in the REPL.

NODE_ICU_DATA=file

Data path for ICU (Intl object) data. Will extend linked-in data when compiled with small-icu support.

NODE_REPL_HISTORY=file

Path to the file used to store the persistent REPL history. The default path is ~/.node_repl_history, which is overridden by this variable. Setting the value to an empty string ("" or " ") disables persistent REPL history.

NODE_EXTRA_CA_CERTS=file

When set, the well known "root" CAs (like VeriSign) will be extended with the extra certificates in file. The file should consist of one or more trusted certificates in PEM format. A message will be printed to stderr (once) if the file is missing or misformatted, but any errors are otherwise ignored.

Note that neither the well known nor extra certificates are used when the ca options property is explicitly specified for a TLS or HTTPS client or server.