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# Command Line Options
<!--type=misc-->
Node.js comes with a wide 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. The modules which are
predefined in the REPL can also be used in `script`.
### `-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.
### `--no-warnings`
Silence all process warnings (including deprecations).
### `--trace-warnings`
Print stack traces for process warnings (including 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.
[Buffer]: buffer.html#buffer_buffer
[debugger]: debugger.html
[REPL]: repl.html
[SlowBuffer]: buffer.html#buffer_class_slowbuffer
|
