Thursday, October 6, 2016

Speeding up NPM

NPM is slow. I mean it is really, really slow when downloading packages. Partially because it makes a ton of requests to remote servers. That can be made faster!

There are 2 options that you'll find useful:

They both create a local cache that npm is later on interact with instead of the remote repository.


This one is really easy to setup and use. Just do
npm install -g npm_lazy
and use npm with the local registry like so:
npm --registry http://localhost:8080 install


This is a bit more complex. Nexus can be started as a stand-alone app quite easily but I would recommend using Docker as it is a far easier experience. So to start Nexus you type:
docker run -d -p 8081:8081 --name nexus sonatype/nexus
Then navigate to http://localhost:8081, login as admin/admin123 and create an npm-proxy. Select "Repositories" from the list on the left hand side, then from the "Add..." drop down at the top select "Add proxy repository", fill in as follows:
  • Repository ID - npm-registry-proxy
  • Repository Name = NPM Registry Proxy
  • Provider - npm
  • Remote Storage Location -
and click on "Create repository".

Use it as follows:

npm --registry http://localhost:8081/content/repositories/npm-registry-proxy install

What's the gain?

Depending on the project you'll see a 30-50 percent speed boost when downloading packages. For the example project that I used here are the stats:
No proxy npm_lazy Nexus
1m43s 1m22s 57s

Have fun!

Edit on 23rd of January 2017: Forget all of the above. Just switch to Yarn and live happily ever after.

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