.\"
.\" This manpage is written in mdoc(7).
.\"
.\" * Language reference:
.\"   https://man.openbsd.org/mdoc.7
.\"
.\" * Atom editor support:
.\"   https://atom.io/packages/language-roff
.\"
.\" * Linting changes:
.\"   mandoc -Wall -Tlint /path/to/this.file  # BSD
.\"   groff -w all -z /path/to/this.file      # GNU/Linux, macOS
.\"
.\"
.\" Before making changes, please note the following:
.\"
.\" * In Roff, each new sentence should begin on a new line. This gives
.\"   the Roff formatter better control over text-spacing, line-wrapping,
.\"   and paragraph justification.
.\"
.\" * Do not leave blank lines in the markup. If whitespace is desired
.\"   for readability, put a dot in the first column to indicate a null/empty
.\"   command. Comments and horizontal whitespace may optionally follow: each
.\"   of these lines are an example of a null command immediately followed by
.\"   a comment.
.\"
.\"======================================================================
.
.Dd 2018
.Dt NODE 1
.
.Sh NAME
.Nm node
.Nd server-side JavaScript runtime
.
.\"======================================================================
.Sh SYNOPSIS
.Nm node
.Op Ar options
.Op Ar v8-options
.Op Fl e Ar string | Ar script.js | Fl
.Op Fl \-
.Op Ar arguments ...
.
.Nm node
.Cm debug
.Op Fl e Ar string | Ar script.js | Fl | Ar <host>:<port>
.Ar ...
.
.Nm node
.Op Fl -v8-options
.
.\"======================================================================
.Sh DESCRIPTION
Node.js is a set of libraries for JavaScript which allows it to be used outside of the browser.
It is primarily focused on creating simple, easy-to-build network clients and servers.
.Pp
Execute
.Nm
without arguments to start a REPL.
.
.Sh OPTIONS
.Bl -tag -width 6n
.It Fl v , Fl -version
Print node's version.
.
.It Fl h , Fl -help
Print node command line options.
The output of this option is less detailed than this document.
.
.It Fl e , Fl -eval Ar string
Evaluate
.Ar string
as JavaScript.
.
.It Fl p , Fl -print Ar string
Identical to
.Fl e ,
but prints the result.
.
.It Fl c , Fl -check
Check the script's syntax without executing it.
Exits with an error code if script is invalid.
.
.It Fl i , Fl -interactive
Open the REPL even if stdin does not appear to be a terminal.
.
.It Fl r , Fl -require Ar module
Preload the specified
.Ar module
at startup.
Follows `require()`'s module resolution rules.
.Ar module
may be either a path to a file, or a node module name.
.
.It Fl -inspect Ns = Ns Ar [host:]port
Activate inspector on
.Ar host:port .
Default is
.Sy 127.0.0.1:9229 .
.Pp
V8 Inspector integration allows attaching Chrome DevTools and IDEs to Node.js instances for debugging and profiling.
It uses the Chrome Debugging Protocol.
.
.It Fl -inspect-brk Ns = Ns Ar [host:]port
Activate inspector on
.Ar host:port
and break at start of user script.
.
.It Fl -inspect-port Ns = Ns Ar [host:]port
Set the
.Ar host:port
to be used when the inspector is activated.
.
.It Fl -no-deprecation
Silence deprecation warnings.
.
.It Fl -trace-deprecation
Print stack traces for deprecations.
.
.It Fl -throw-deprecation
Throw errors for deprecations.
.
.It Fl -pending-deprecation
Emit pending deprecation warnings.
.
.It Fl -no-warnings
Silence all process warnings (including deprecations).
.
.It Fl -napi-modules
Enable loading native modules compiled with the ABI-stable Node.js API (N-API)
(experimental).
.
.It Fl -abort-on-uncaught-exception
Aborting instead of exiting causes a core file to be generated for analysis.
.
.It Fl -trace-warnings
Print stack traces for process warnings (including deprecations).
.
.It Fl -redirect-warnings Ns = Ns Ar file
Write process warnings to the given
.Ar file
instead of printing to stderr.
.
.It Fl -trace-sync-io
Print a stack trace whenever synchronous I/O is detected after the first turn of the event loop.
.
.It Fl -no-force-async-hooks-checks
Disable runtime checks for `async_hooks`.
These will still be enabled dynamically when `async_hooks` is enabled.
.
.It Fl -trace-events-enabled
Enable the collection of trace event tracing information.
.
.It Fl -trace-event-categories Ar categories
A comma-separated list of categories that should be traced when trace event tracing is enabled using
.Fl -trace-events-enabled .
.
.It Fl -trace-event-file-pattern Ar pattern
Template string specifying the filepath for the trace event data, it
supports \fB${rotation}\fR and \fB${pid}\fR.
.
.It Fl -zero-fill-buffers
Automatically zero-fills all newly allocated Buffer and SlowBuffer instances.
.
.It Fl -preserve-symlinks
Instructs the module loader to preserve symbolic links when resolving and caching modules.
.
.It Fl -track-heap-objects
Track heap object allocations for heap snapshots.
.
.It Fl -prof-process
Process V8 profiler output generated using the V8 option
.Fl -prof .
.
.It Fl -v8-options
Print V8 command-line options.
.Pp
Note: V8 options allow words to be separated by both dashes (\fB-\fR) or underscores (\fB_\fR).
.Pp
For example,
.Fl -stack-trace-limit
is equivalent to
.Fl -stack_trace_limit .
.
.It Fl -v8-pool-size Ns = Ns Ar num
Set V8's thread pool size which will be used to allocate background jobs.
If set to 0 then V8 will choose an appropriate size of the thread pool based on the number of online processors.
If the value provided is larger than V8's maximum, then the largest value will be chosen.
.
.It Fl -tls-cipher-list Ns = Ns Ar list
Specify an alternative default TLS cipher list.
Requires Node.js to be built with crypto support. (Default)
.
.It Fl -enable-fips
Enable FIPS-compliant crypto at startup.
Requires Node.js to be built with
.Sy ./configure --openssl-fips .
.
.It Fl -force-fips
Force FIPS-compliant crypto on startup
(Cannot be disabled from script code).
Same requirements as
.Fl -enable-fips .
.
.It Fl -openssl-config Ns = Ns Ar file
Load an OpenSSL configuration file on startup.
Among other uses, this can be used to enable FIPS-compliant crypto if Node.js is built with
.Sy ./configure --openssl-fips .
.
.It Fl -use-openssl-ca , Fl -use-bundled\-ca
Use OpenSSL's default CA store or use bundled Mozilla CA store as supplied by current Node.js version.
The default store is selectable at build-time.
.Pp
Using OpenSSL store allows for external modifications of the store.
For most Linux and BSD distributions, this store is maintained by the distribution maintainers and system administrators.
OpenSSL CA store location is dependent on configuration of the OpenSSL library but this can be altered at runtime using environment variables.
.Pp
The bundled CA store, as supplied by Node.js, is a snapshot of Mozilla CA store that is fixed at release time.
It is identical on all supported platforms.
.Pp
See
.Ev SSL_CERT_DIR
and
.Ev SSL_CERT_FILE .
.
.It Fl -icu-data-dir Ns = Ns Ar file
Specify ICU data load path.
Overrides
.Ev NODE_ICU_DATA .
.
.It Fl \-experimental-modules
Enable experimental ES module support and caching modules.
.
.It Fl \-experimental-vm-modules
Enable experimental ES module support in VM module.
.
.It Sy \-
Alias for stdin, analogous to the use of - in other command-line utilities.
The executed script is read from stdin, and remaining arguments are passed to the script.
.
.It Fl \-
Indicate the end of node options.
Pass the rest of the arguments to the script.
.Pp
If no script filename or eval/print script is supplied prior to this, then
the next argument will be used as a script filename.
.El
.
.\" =====================================================================
.Sh ENVIRONMENT
.Bl -tag -width 6n
.It Ev NODE_DEBUG Ar modules...
Comma-separated list of core modules that should print debug information.
.
.It Ev NODE_DISABLE_COLORS
When set to
.Ar 1 ,
colors will not be used in the REPL.
.
.It Ev NODE_EXTRA_CA_CERTS Ar file
When set, the well-known
.Dq root
CAs (like VeriSign) will be extended with the extra certificates in
.Ar file .
The file should consist of one or more trusted certificates in PEM format.
.Pp
If
.Ar file
is missing or misformatted, a message will be emitted once using
.Sy process.emitWarning() ,
but any errors are otherwise ignored.
.
.It Ev NODE_ICU_DATA Ar file
Data path for ICU (Intl object) data.
Will extend linked-in data when compiled with small-icu support.
.
.It Ev NODE_NO_WARNINGS
When set to
.Ar 1 ,
process warnings are silenced.
.
.It Ev NODE_OPTIONS Ar options...
A space-separated list of command-line
.Ar options ,
which are interpreted as if they had been specified on the command-line before the actual command (so they can be overridden).
Node will exit with an error if an option that is not allowed in the environment is used, such as
.Fl -print
or a script file.
.
.It Ev NODE_PATH Ar directories...
A colon-separated list of
.Ar directories
prefixed to the module search path.
.
.It Ev NODE_PENDING_DEPRECATION
When set to
.Ar 1 ,
emit pending deprecation warnings.
.
.It Ev NODE_REPL_HISTORY Ar file
Path to the
.Ar file
used to store persistent REPL history.
The default path is
.Sy ~/.node_repl_history ,
which is overridden by this variable.
Setting the value to an empty string ("" or " ") will disable persistent REPL history.
.
.It Ev OPENSSL_CONF Ar file
Load an OpenSSL configuration file on startup.
Among other uses, this can be used to enable FIPS-compliant crypto if Node.js is built with
.Sy ./configure --openssl-fips .
.Pp
If the
.Fl -openssl-config
command-line option is used, this environment variable is ignored.
.
.It Ev SSL_CERT_DIR Ar dir
If
.Fl -use-openssl-ca
is enabled, this overrides and sets OpenSSL's directory containing trusted certificates.
.
.It Ev SSL_CERT_FILE Ar file
If
.Fl -use-openssl-ca
is enabled, this overrides and sets OpenSSL's file containing trusted certificates.
.
.It Ev NODE_REDIRECT_WARNINGS Ar file
Write process warnings to the given
.Ar file
instead of printing to stderr.
Equivalent to passing
.Fl -redirect-warnings Ar file
on command-line.
.El
.
.\"=====================================================================
.Sh BUGS
Bugs are tracked in GitHub Issues:
.Sy https://github.com/nodejs/node/issues
.
.\"======================================================================
.Sh COPYRIGHT
Copyright Node.js contributors.
Node.js is available under the MIT license.
.
.Pp
Node.js also includes external libraries that are available under a variety of licenses.
See
.Sy https://github.com/nodejs/node/blob/master/LICENSE
for the full license text.
.
.\"======================================================================
.Sh SEE ALSO
Website:
.Sy https://nodejs.org/
.
.Pp
Documentation:
.Sy https://nodejs.org/api/
.
.Pp
GitHub repository & Issue Tracker:
.Sy https://github.com/nodejs/node
.
.Pp
Mailing list:
.Sy http://groups.google.com/group/nodejs
.
.Pp
IRC (general questions):
.Sy "chat.freenode.net #node.js"
(unofficial)
.
.Pp
IRC (Node.js core development):
.Sy "chat.freenode.net #node-dev"
.
.\"======================================================================
.Sh AUTHORS
Written and maintained by 1000+ contributors:
.Sy https://github.com/nodejs/node/blob/master/AUTHORS
.