blocks|key|338974|text|是。您可以使用child_process来执行系统命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|338975|var+exec+=+require('child_process').exec,
++++child;

+child+=+exec('npm+install+ffi',
+function+(error,+stdout,+stderr)+{
+++++console.log('stdout:+'+%2B+stdout);
+++++console.log('stderr:+'+%2B+stderr);
+++++if+(error+!==+null)+{
++++++++++console.log('exec+error:+'+%2B+error);
+++++}
+});|code-block|syntax|javascript|338976|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

yes. you can use child_process to execute a system command

<pre><code>var exec = require('child_process').exec,
 child;

 child = exec('npm install ffi',
 function (error, stdout, stderr) {
 console.log('stdout: ' + stdout);
 console.log('stderr: ' + stderr);
 if (error !== null) {
 console.log('exec error: ' + error);
 }
 });
</code></pre>

blocks|key|121405|text|实际上，这可能有点简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|121406|var+exec+=+require('child_process').exec;
child+=+exec('npm+install+ffi').stderr.pipe(process.stderr);|code-block|syntax|javascript|121407|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

it can actually be a bit easy

<pre><code>var exec = require('child_process').exec;
child = exec('npm install ffi').stderr.pipe(process.stderr);
</code></pre>

blocks|key|339067|text|我花了一段时间尝试让第一个示例在项目目录中工作，在这里发布，以防其他人发现这一点。据我所知，NPM仍然可以很好地直接加载，但因为它假设了CLI，所以我们必须重复进行一些设置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339068|//+this+must+come+before+load+to+set+your+project+directory
var+previous+=+process.cwd();
process.chdir(project);

//+this+is+the+part+missing+from+the+example+above
var+conf+=+{'bin-links':+false,+verbose:+true,+prefix:+project}

//+this+is+all+mostly+the+same

var+cli+=+require('npm');
cli.load(conf,+(err)+=>+{
++++//+handle+errors
++++if(err)+{
++++++++return+reject(err);
++++}

++++//+install+module
++++cli.commands.install(['ffi'],+(er,+data)+=>+{
++++++++process.chdir(previous);
++++++++if(err)+{
++++++++++++reject(err);
++++++++}
++++++++//+log+errors+or+data
++++++++resolve(data);
++++});

++++cli.on('log',+(message)+=>+{
++++++++//+log+installation+progress
++++++++console.log(message);
++++});
});|code-block|syntax|javascript|339069|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had a heck of a time trying to get the first example to work inside a project directory, posting here in case anyone else finds this. As far as I can tell, NPM still works fine loaded directly, but because it assumes CLI, we have to repeat ourselves a little setting it up:

<pre><code>// this must come before load to set your project directory
var previous = process.cwd();
process.chdir(project);

// this is the part missing from the example above
var conf = {'bin-links': false, verbose: true, prefix: project}

// this is all mostly the same

var cli = require('npm');
cli.load(conf, (err) =&gt; {
 // handle errors
 if(err) {
 return reject(err);
 }

 // install module
 cli.commands.install(['ffi'], (er, data) =&gt; {
 process.chdir(previous);
 if(err) {
 reject(err);
 }
 // log errors or data
 resolve(data);
 });

 cli.on('log', (message) =&gt; {
 // log installation progress
 console.log(message);
 });
});
</code></pre>

blocks|key|339120|text|我是一个模块的作者，它允许你完全按照你的想法去做。参见live-plugin-manager。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|339121|您几乎可以从NPM、Github或文件夹安装和运行任何包。|339122|下面是一个示例：|339123|import+{PluginManager}+from+"live-plugin-manager";

const+manager+=+new+PluginManager();

async+function+run()+{
++await+manager.install("moment");

++const+moment+=+manager.require("moment");
++console.log(moment().format());

++await+manager.uninstall("moment");
}

run();|code-block|syntax|javascript|339124|在上面的代码中，我在运行时安装moment包，加载并执行它。最后，我卸载了它。|style|CODE|339125|在内部，我不运行npm+cli，但实际上是下载包并在节点VM沙箱中运行。|339126|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/live-plugin-manager^0|R|J|0|0|0|0|0|F|6|0|8|3|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|17|8|@$A|18|B|19|O|P]]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1A|8|@$A|1B|B|1C|O|P]]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

I'm the author of a module that allow to do exactly what you have in mind.
See <a href="https://www.npmjs.com/package/live-plugin-manager" rel="nofollow noreferrer">live-plugin-manager</a>.

You can install and run virtually any package from NPM, Github or from a folder.

Here an example:

<pre><code>import {PluginManager} from "live-plugin-manager";

const manager = new PluginManager();

async function run() {
 await manager.install("moment");

 const moment = manager.require("moment");
 console.log(moment().format());

 await manager.uninstall("moment");
}

run();
</code></pre>

In the above code I install <code>moment</code> package at runtime, load and execute it. At the end I uninstall it.

Internally I don't run <code>npm</code> cli but actually download packages and run inside a node VM sandbox.

blocks|key|121516|text|pacote是npm用来获取包元数据和tarball的包。它有一个稳定的公共API。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|121517|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/pacote^0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="https://www.npmjs.com/package/pacote" rel="nofollow noreferrer">pacote</a> is the package that npm uses to fetch package metadata and tarballs. It has a stable, public API.

blocks|key|339190|text|@hexacyanide提供了一个很好的解决方案，但事实证明NPM不再发出"log“事件(至少从6.4.1版本开始)。相反，它们依赖于独立的模块https://github.com/npm/npmlog。幸运的是，它是一个单例，所以我们可以访问NPM用于日志和订阅日志事件的完全相同的实例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|339191|const+npmlog+=+require(+"npm/node_modules/npmlog"+),
++++++npm+=+require(+"npm"+);

npmlog.on(+"log",+msg+=>+{
+++console.log({+msg+});
});

+process.on("time",+milestone+=>+{
+++console.log({+milestone+});
+});

+process.on("timeEnd",+milestone+=>+{
+++console.log({+milestone+});++++
+});

+npm.load({
++++loaded:+false,
++++progress:+false,
++++"no-audit":+true
++},+(+err+)+=>+{

+npm.commands.install(+installDirectory,+[
++++++"cross-env@%5E5.2.0",
++++++"shelljs@%5E0.8.2"
++++],+(+err,+data+)+=>+{
+++++++console.log(+"done"+);++++
++++});

++});|code-block|syntax|javascript|339192|正如您从代码中看到的，NPM还会在process上发出性能指标，因此我们也可以使用它来监控进度。|style|CODE|339193|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/npm/npmlog^0|20|T|0|0|0|H|7|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

A great solution by @hexacyanide, but it turned out that NPM doesn't emit "log" event anymore (at least as of version 6.4.1). Instead they rely on a standalone module <a href="https://github.com/npm/npmlog" rel="nofollow noreferrer">https://github.com/npm/npmlog</a>. Fortunately it's a singleton, so we can reach the very same instance NPM uses for logs and subscribe for log events:

<pre><code>const npmlog = require( "npm/node_modules/npmlog" ),
 npm = require( "npm" );

npmlog.on( "log", msg =&gt; {
 console.log({ msg });
});

 process.on("time", milestone =&gt; {
 console.log({ milestone });
 });

 process.on("timeEnd", milestone =&gt; {
 console.log({ milestone }); 
 });

 npm.load({
 loaded: false,
 progress: false,
 "no-audit": true
 }, ( err ) =&gt; {

 npm.commands.install( installDirectory, [
 "cross-env@^5.2.0",
 "shelljs@^0.8.2"
 ], ( err, data ) =&gt; {
 console.log( "done" ); 
 });

 });
</code></pre>

As you can see from the code, NPM also emits performance metrics on the <code>process</code>, so we can also use it to monitor the progress.

blocks|key|339216|text|这里没有提到的另一种选择是执行派生并直接从./node_modules/npm/bin/npm-cli.js运行命令行界面|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|339217|例如，您希望能够通过在未安装NPM的机器上运行脚本来安装节点模块。而且您确实希望使用CLI来执行此操作。在这种情况下，只需在构建程序(npm+i+npm)时在node_modules中本地安装NPM即可。|339218|然后像这样使用它：|339219|//+Require+child_process+module
const+{+fork+}+=+require('child_process');
//+Working+directory+for+subprocess+of+installer
const+cwd+=+'./path-where-to-run-npm-command';+
//+CLI+path+FROM+cwd+path!+Pay+attention
//+here+-+path+should+be+FROM+your+cwd+directory
//+to+your+locally+installed+npm+module
const+cli+=+'../node_modules/npm/bin/npm-cli.js';
//+NPM+arguments+to+run+with
//+If+your+working+directory+already+contains
//+package.json+file,+then+just+install+it!
const+args+=+['install'];+//+Or,+i.e+['audit',+'fix']

//+Run+installer
const+installer+=+fork(cli,+args,+{
++silent:+true,
++cwd:+cwd
});

//+Monitor+your+installer+STDOUT+and+STDERR
installer.stdout.on('data',+(data)+=>+{
++console.log(data);
});
installer.stderr.on('data',+(data)+=>+{
++console.log(data);
});

//+Do+something+on+installer+exit
installer.on('exit',+(code)+=>+{
++console.log(`Installer+process+finished+with+code+${code}`);
});|code-block|syntax|javascript|339220|然后你的程序甚至可以打包成二进制文件，例如使用PKG包。在这种情况下，您需要使用node+npm选项，因为--ignore-scripts+-gyp需要运行预安装脚本|339221|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/pkg^0|L|X|0|1V|9|0|0|0|1H|G|N|3|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

Another option, which wasn't mentioned here, is to do fork and run CLI right from <code>./node_modules/npm/bin/npm-cli.js</code>

For example you want to be able to install node modules from running script on machine, which do not have NPM installed. And you DO want to do it with CLI. In this case just install NPM in your node_modules locally while building your program (<code>npm i npm</code>).

Then use it like this:

<pre class="lang-javascript prettyprint-override"><code>// Require child_process module
const { fork } = require('child_process');
// Working directory for subprocess of installer
const cwd = './path-where-to-run-npm-command'; 
// CLI path FROM cwd path! Pay attention
// here - path should be FROM your cwd directory
// to your locally installed npm module
const cli = '../node_modules/npm/bin/npm-cli.js';
// NPM arguments to run with
// If your working directory already contains
// package.json file, then just install it!
const args = ['install']; // Or, i.e ['audit', 'fix']

// Run installer
const installer = fork(cli, args, {
 silent: true,
 cwd: cwd
});

// Monitor your installer STDOUT and STDERR
installer.stdout.on('data', (data) =&gt; {
 console.log(data);
});
installer.stderr.on('data', (data) =&gt; {
 console.log(data);
});

// Do something on installer exit
installer.on('exit', (code) =&gt; {
 console.log(`Installer process finished with code ${code}`);
});
</code></pre>

Then your program could be even packed to binary file, for example with <a href="https://www.npmjs.com/package/pkg" rel="nofollow noreferrer">PKG</a> package. In this case you need to use <code>--ignore-scripts</code> npm option, because node-gyp required to run preinstall scripts

blocks|key|339257|text|在tarkh's+great+answer上添加了更多内容。如果您不打算显式安装npm+CLI，并且已经通过package.json文件安装了npm。那么./node_modules/npm/bin/npm-cli.js中的文件就是可用于运行命令的命令行界面。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|339258|为了使其全局可用，请运行以下命令并将二进制文件添加到路径中。|339259|ln+-sf+/usr/app/node_modules/npm/bin/npm-cli.js+/usr/bin/npm|code-block|syntax|javascript|339260|另外，如果这对某人有帮助。下面是如何模仿npm+install命令来安装package.json中的所有包。|339261|const+npm+=+require('npm');
const+Bluebird+=+require('bluebird');

++++async+installDependencies()+{
++++++++++++await+Bluebird.promisify(npm.load)({
++++++++++++++++loglevel:+'silent',
++++++++++++++++progress:+false,
++++++++++++});
++++++++++++await+Bluebird.promisify(npm.install)(
++++++++++++++++"/path/to/directory/where/package.json/is",
++++++++++++);
++++++++}|339262|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/57914191/8522689^0|25|X|1|K|0|0|0|0|K|B|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

Adding on to a little more to <a href="https://stackoverflow.com/a/57914191/8522689">tarkh's great answer</a>. If you don't intend to install npm CLI explicitly and already are installing npm through the package.json file. Then the file in the <code>./node_modules/npm/bin/npm-cli.js</code> is the CLI that can be used to run commands.
In order to make this globally available, run the following command and add the binary to the path.
<pre class="lang-sh prettyprint-override"><code>ln -sf /usr/app/node_modules/npm/bin/npm-cli.js /usr/bin/npm
</code></pre>
Additionally, if it helps someone. Here's how you can mimic the <code>npm install</code> command in order to install all packages in the package.json.
<pre class="lang-js prettyprint-override"><code>const npm = require('npm');
const Bluebird = require('bluebird');

 async installDependencies() {
 await Bluebird.promisify(npm.load)({
 loglevel: 'silent',
 progress: false,
 });
 await Bluebird.promisify(npm.install)(
 &quot;/path/to/directory/where/package.json/is&quot;,
 );
 }
</code></pre>

Can I install a NPM package from a javascript file running in Node.js? For example, I'd like to have a script, let's call it "script.js" that somehow (...using NPM or not...) install a package usually available through NPM. In this example, I'd like to install "FFI". (npm install ffi)

Can I install a NPM package from javascript running in Node.js?

我可以从Node.js中运行的javascript文件安装NPM包吗？例如，我想有一个脚本，让我们称它为"script.js“，不管是不是...using NPM ...)安装一个通常可以通过NPM获得的包。在本例中，我想安装"FFI“。(npm安装ffi)

问我能从Node.js中运行的javascript安装NPM包吗？
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