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copied!<p>NPM NodeJS API is not well documented, but checking the code helps up.</p> <p><a href="https://github.com/isaacs/npm/blob/a362c3f1919987419ed8a37c8defa19d2e6697b0/lib/install.js#L16-L29" rel="noreferrer">Here</a> we find the following string:</p> <pre><code>install.usage = "npm install" + "\nnpm install <pkg>" + "\nnpm install <pkg>@<tag>" + "\nnpm install <pkg>@<version>" + "\nnpm install <pkg>@<version range>" + "\nnpm install <folder>" + "\nnpm install <tarball file>" + "\nnpm install <tarball url>" + "\nnpm install <git:// url>" + "\nnpm install <github username>/<github project>" + "\n\nCan specify one or more: npm install ./foo.tgz bar@stable /some/folder" + "\nIf no argument is supplied and ./npm-shrinkwrap.json is " + "\npresent, installs dependencies specified in the shrinkwrap." + "\nOtherwise, installs dependencies from ./package.json." </code></pre> <p>My question is about the version, so we can do: <code>hello-world@0.0.1</code> to install <code>0.0.1</code> version of <code>hello-world</code>.</p> <pre><code>var npm = require("npm"); npm.load({ loaded: false }, function (err) { // catch errors npm.commands.install(["hello-world@0.0.1"], function (er, data) { // log the error or data }); npm.on("log", function (message) { // log the progress of the installation console.log(message); }); }); </code></pre> <p>I didn't test, but I am sure that we can use any format of the <code>install.usage</code> solutions.</p> <p>I wrote a function that converts the <code>dependencies</code> object in an array that can be passed to the <code>install</code> function call.</p> <p><code>dependencies:</code></p> <pre><code>{ "hello-world": "0.0.1" } </code></pre> <p>The function gets the path to the <code>package.json</code> file and returns an array of strings.</p> <pre><code>function createNpmDependenciesArray (packageFilePath) { var p = require(packageFilePath); if (!p.dependencies) return []; var deps = []; for (var mod in p.dependencies) { deps.push(mod + "@" + p.dependencies[mod]); } return deps; } </code></pre>

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