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# Command Line Options
<!--type=misc-->
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`
<!-- YAML
added: v0.1.3
-->
Print node's version.
### `-h`, `--help`
<!-- YAML
added: v0.1.3
-->
Print node command line options.
The output of this option is less detailed than this document.
### `-e`, `--eval "script"`
<!-- YAML
added: v0.5.2
-->
Evaluate the following argument as JavaScript.
### `-p`, `--print "script"`
<!-- YAML
added: v0.6.4
-->
Identical to `-e` but prints the result.
### `-c`, `--check`
<!-- YAML
added: v4.2.0
-->
Syntax check the script without executing.
### `-i`, `--interactive`
<!-- YAML
added: v0.7.7
-->
Opens the REPL even if stdin does not appear to be a terminal.
### `-r`, `--require module`
<!-- YAML
added: v1.6.0
-->
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`
<!-- YAML
added: v0.8.0
-->
Silence deprecation warnings.
### `--trace-deprecation`
<!-- YAML
added: v0.8.0
-->
Print stack traces for deprecations.
### `--throw-deprecation`
<!-- YAML
added: v0.11.14
-->
Throw errors for deprecations.
### `--trace-sync-io`
<!-- YAML
added: v2.1.0
-->
Prints a stack trace whenever synchronous I/O is detected after the first turn
of the event loop.
### `--zero-fill-buffers`
<!-- YAML
added: v4.5.0
-->
Automatically zero-fills all newly allocated [Buffer][] and [SlowBuffer][]
instances.
### `--track-heap-objects`
<!-- YAML
added: v2.4.0
-->
Track heap object allocations for heap snapshots.
### `--prof-process`
<!-- YAML
added: v4.4.0
-->
Process v8 profiler output generated using the v8 option `--prof`.
### `--v8-options`
<!-- YAML
added: v0.1.3
-->
Print v8 command line options.
### `--tls-cipher-list=list`
<!-- YAML
added: v4.0.0
-->
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`
<!-- YAML
added: v0.11.15
-->
Specify ICU data load path. (overrides `NODE_ICU_DATA`)
## Environment Variables
### `NODE_DEBUG=module[,…]`
<!-- YAML
added: v0.1.32
-->
`','`-separated list of core modules that should print debug information.
### `NODE_PATH=path[:…]`
<!-- YAML
added: v0.1.32
-->
`':'`-separated list of directories prefixed to the module search path.
_Note: on Windows, this is a `';'`-separated list instead._
### `NODE_DISABLE_COLORS=1`
<!-- YAML
added: v0.3.0
-->
When set to `1` colors will not be used in the REPL.
### `NODE_ICU_DATA=file`
<!-- YAML
added: v0.11.15
-->
Data path for ICU (Intl object) data. Will extend linked-in data when compiled
with small-icu support.
### `NODE_REPL_HISTORY=file`
<!-- YAML
added: v3.0.0
-->
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`
<!-- YAML
added: XXX
-->
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.
[emit_warning]: process.html#process_process_emitwarning_warning_name_ctor
[Buffer]: buffer.html#buffer_buffer
[debugger]: debugger.html
[REPL]: repl.html
[SlowBuffer]: buffer.html#buffer_class_slowbuffer
|
