npm install can't resolve git repositories - certificate failure

Question

I have a nodejs project with a package.json file (on ubuntu). Some dependencies in the package.json file pointing to git-repositories (gitlab with a self signed certificate).

If I call

npm install

npm should resolve and install all dependencies. Unfortunatly I have the following error message:

npm ERR! git clone https://git.repository.domain.com/myname/grunt-grunticon-hover.git Cloning into bare repository '/home/dev/.npm/_git-remotes/https-git-repository-domain-com-myname-grunt-grunticon-hover-git-15073ad9'...
npm ERR! git clone https://git.repository.domain.com/myname/grunt-grunticon-hover.git 
npm ERR! git clone https://git.repository.domain.com/myname/grunt-grunticon-hover.git error: server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none while accessing https://git.repository.domain.com/myname/grunt-grunticon-hover.git/info/refs?service=git-upload-pack
npm ERR! git clone https://git.repository.domain.com/myname/grunt-grunticon-hover.git fatal: HTTP request failed
npm ERR! Error: Command failed: error: server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none while accessing https://git.repository.domain.com/myname/grunt-grunticon-hover.git/info/refs?service=git-upload-pack

If I clone the repository with "git clone ..." I have no problems.

Do I have to install a certificate? How can I install the certificate? Where do I find the certificate?

I am using ubuntu.

Answer 1

use git+ssh in your package.json:

"dependencies": {
  "myname": "git+ssh://git.repository.domain.com/myname/grunt-grunticon-hover.git"
}