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  Copyright (C) Nginx, Inc.
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<article name="Command-line interface"
        link="/en/docs/njs/cli.html"
        lang="en"
        rev="4">

<section>
<para>
njs scripts development and debugging can be performed
from the command-line.
The command-line utility is available after the installation of
the Linux <link doc="install.xml" id="install_package">package</link>
or after building from the
<link doc="install.xml" id="install_sources">sources</link>.
Compared to njs running inside nginx,
nginx objects
(<link doc="reference.xml" id="http">HTTP</link> and
<link doc="reference.xml" id="stream">Stream</link>)
are not available in the utility.
<example>
$ echo "2**3" | njs -q
8

$ njs
>> globalThis
global {
 njs: njs {
  version: '0.3.9'
 },
 global: [Circular],
 process: process {
  argv: [
   '/usr/bin/njs'
  ],
  env: {
   PATH: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
   HOSTNAME: 'f777c149d4f8',
   TERM: 'xterm',
   NGINX_VERSION: '1.17.9',
   NJS_VERSION: '0.3.9',
   PKG_RELEASE: '1~buster',
   HOME: '/root'
  }
 },
 console: {
  log: [Function: native],
  dump: [Function: native],
  time: [Function: native],
  timeEnd: [Function: native]
 },
 print: [Function: native]
}
>>
</example>
</para>

</section>

</article>