What is the recommended way to install Node.js, nvm and npm on MacOS X?

Using homebrew install nvm: brew update brew install nvm source $(brew –prefix nvm)/nvm.sh Add the last command to the .profile, .bashrc or .zshrc file to not run it again on every terminal start. So for example to add it to the .profile run: echo “source $(brew –prefix nvm)/nvm.sh” >> ~/.profile If you have trouble with … Read more

How do I install a module globally using npm?

If you want to install a npm module globally, make sure to use the new -g flag, for example: npm install forever -g The general recommendations concerning npm module installation since 1.0rc (taken from blog.nodejs.org): If you’re installing something that you want to use in your program, using require(‘whatever’), then install it locally, at the … Read more

How do I determine the correct “max-old-space-size” for node.js?

“Old space” is the biggest and most configurable section of V8’s managed (aka garbage-collected) heap (i.e. where the JavaScript objects live), and the –max-old-space-size flag controls its maximum size. As memory consumption approaches the limit, V8 will spend more time on garbage collection in an effort to free unused memory. If heap memory consumption (i.e. … Read more

Downloading images with node.js [closed]

I’d suggest using the request module. Downloading a file is as simple as the following code: var fs = require(‘fs’), request = require(‘request’); var download = function(uri, filename, callback){ request.head(uri, function(err, res, body){ console.log(‘content-type:’, res.headers[‘content-type’]); console.log(‘content-length:’, res.headers[‘content-length’]); request(uri).pipe(fs.createWriteStream(filename)).on(‘close’, callback); }); }; download(‘https://www.google.com/images/srpr/logo3w.png’, ‘google.png’, function(){ console.log(‘done’); });

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