How to solve npm error “npm ERR! code ELIFECYCLE”

Question

I\'m trying to learn react, so I have this sample code for the full-stack react voting app, and I am trying to get it to work but after running npm install followed by npm s

Answer 1

A possibly unexpected cause: you use Create React App with some warnings left unfixed, and the project fails on CI (e.g. GitLab CI/CD):

Treating warnings as errors because process.env.CI = true.
[ ... some warnings here ...]
npm ERR! code ELIFECYCLE
npm ERR! errno 1

Solution: fix yo' warnings!

Alternative: use CI=false npm run build

See CRA issue #3657

^{(Ashamed to admit that it just happened to me; did not see it until a colleague pointed it out. Thanks Pascal!)}