When I run `npm install`, it returns with `ERR! code EINTEGRITY` (npm 5.3.0)

See https://github.com/npm/npm/issues/16861

This worked for me:
npm cache verify

Then I re-ran:
npm install -g create-react-app

And it installed as expected: Issue resolved.

---

Other solutions mentioned in the GitHub issue include:

npm cache clean --force

OR

Deleting npm and npm-cache folders in Users%username%\AppData\Roaming (Windows 7 and Windows 10) and running npm install

OR

Update npm by via npm i -g npm

OR

Delete package-lock.json

OR

npm cache clean

OR

Do these steps to fix the problem:

1. Find all outdated packages and update theme:
   npm outdated -g
sudo npm i -g outDatedPKG
2. Upgrade npm to latest version with:
   sudo npm i -g npm
3. Delete package-lock.json file.
4. Delete _cacache directory in ~/.npm:
   npm cache verify
5. Every time I get that error, do steps 2 & 3.
6. If you still get the error, clear npm’s cache:
   npm cache clean --force

OR

1. Add proxy to .npmrc in ~ directory:

proxy=http://localhost:8123
https-proxy=http://localhost:8123

2. Try again! slow internet connection and censorship may cause this ugly problem.

OR

npm cache clear --force && npm install --no-shrinkwrap --update-binary

OR

npm config set package-lock false