How to fix npm install hangs on ‘sill idealTree buildDeps’

If you’ve worked with Node.js projects, you’ve probably run into this: you type npm install, hit enter, and… nothing. It just sits there stuck on sill idealTree buildDeps. No errors. No progress. Just endless waiting.

This is a common npm issue, especially in large or older projects. Here’s how to diagnose and fix it fast.

Why Does npm install Hang?

The line sill idealTree buildDeps in your npm logs means npm is trying to resolve your dependencies, figure out what versions to install, and build a tree of everything your project needs.

But sometimes, this process freezes due to:

• Network issues
• Corrupted cache
• Permission problems
• Dependency conflicts
• Outdated npm or Node.js versions

Step-by-Step Fixes

1. Clear the npm Cache

A corrupted cache is a top culprit. Clear it with:

npm cache clean --force

Then try installing again:

npm install

2. Delete node_modules and package-lock.json

Sometimes, an old or messed-up node_modules folder or lock file blocks progress. Start fresh:

rm -rf node_modules package-lock.json
npm install

3. Update npm and Node.js

Old versions can get stuck more easily. Update both:

npm install -g npm
# For Node.js, use n or nvm:
n latest
# or
nvm install node

Then, try again.

4. Switch npm Registries

Sometimes, npm’s default registry is slow or buggy, especially in certain regions. Try switching to a mirror like Yarn or Taobao:

npm config set registry https://registry.npmmirror.com
npm install

Switch back after if needed:

npm config set registry https://registry.npmjs.org

5. Check Your Network

Corporate proxies, VPNs, and bad Wi-Fi all cause issues. Try:

• Disabling your VPN
• Switching to a different network
• Temporarily disconnecting from your proxy

6. Run as Administrator (Windows)

On Windows, permission problems can silently break npm. Run your terminal as Administrator:

• Right-click your terminal app
• Select “Run as administrator”

Then install again.

7. Use Legacy Peer Dependencies (npm v7+)

With npm v7 and above, strict peer dependencies sometimes break installs. Try:

npm install --legacy-peer-deps

Still Stuck? Try These

• Clone a fresh copy of your repo.
• Use a different machine (to rule out system problems).
• Install dependencies one by one (to find the offender).

Final Thoughts

The sill idealTree buildDeps hang is annoying, but usually fixable. The tips above solve it for 99% of developers. If all else fails, check your logs, try smaller installs, or ask for help on Stack Overflow.

Have you got another fix that worked for you? Drop it in the comments!

Mark Vincent

Tech enthusiast and content creator passionate about making technology simple for everyone. I share practical tips, guides, and reviews on the latest in computers, software, and gadgets. Let’s explore the digital world together!