87

Node.js Command Line Options

There is a wide variety of command line options in Node.js. These options provide multiple ways to execute scripts and other helpful run-time options.

Let’s see the list of Node.js command line options:

Index	Option	Description
1.	v, –version	It is used to print node’s version.
2.	-h, –help	It is used to print node command line options.
3.	-e, –eval “script”	It evaluates the following argument as JavaScript. The modules which are predefined in the REPL can also be used in script.
4.	-p, –print “script”	It is identical to -e but prints the result.
5.	-c, –check	Syntax check the script without executing.
6.	-i, –interactive	It opens the REPL even if stdin does not appear to be a terminal.
7.	-r, –require module	It is used to preload the specified module at startup. It follows require()’s module resolution rules. Module may be either a path to a file, or a node module name.
8.	–no-deprecation	Silence deprecation warnings.
9.	–trace-deprecation	It is used to print stack traces for deprecations.
10.	–throw-deprecation	It throws errors for deprecations.
11.	–no-warnings	It silence all process warnings (including deprecations).
12.	–trace-warnings	It prints stack traces for process warnings (including deprecations).
13.	–trace-sync-io	It prints a stack trace whenever synchronous i/o is detected after the first turn of the event loop.
14.	–zero-fill-buffers	Automatically zero-fills all newly allocated buffer and slowbuffer instances.
15.	–track-heap-objects	It tracks heap object allocations for heap snapshots.
16.	–prof-process	It processes V8 profiler output generated using the v8 option –prof.
17.	–V8-options	It prints V8 command line options.
18.	–tls-cipher-list=list	It specifies an alternative default tls cipher list. (requires node.js to be built with crypto support. (default))
19.	–enable-fips	It enables fips-compliant crypto at startup. (requires node.js to be built with ./configure –openssl-fips)
20.	–force-fips	It forces fips-compliant crypto on startup. (cannot be disabled from script code.) (same requirements as –enable-fips)
21.	–icu-data-dir=file	It specifies ICU data load path. (Overrides node_icu_data)

Node.js Command Line Options Examples

To see the version of the running Node:

Open Node.js command prompt and run command node -v or node –version

For Help:

Use command node ?h or node –help

To evaluate an argument (but not print result):

Use command node -e, –eval “script”

To evaluate an argument and print result also:

Use command node -p “script”

To open REPL even if stdin doesn’t appear:

Use command node -i, or node –interactive