Can't install express because npm install express error

问题

I'm receiving the following errors when trying to install express:

1. npm ERR! code ERR_OSSL_PEM_NO_START_LINE
2. npm ERR! errno ERR_OSSL_PEM_NO_START_LINE
3. npm ERR! request to https://registry.npmjs.org/express failed, reason: error:0909006C:PEM routines:get_name:no start line

回答1:

Type this command

npm set registry http://registry.npmjs.org/ 

and after that try again

npm install express

as per this issue it is a certificate related problem

回答2:

I also had a problem like that... and looking around for various solutions on the internet I tried a few of these:

• Try npm install to another repository
• Try install another version of node.js
• npm set registry http://registry.npmjs.org/

If the above method still fails. You can try these:

1. Uninstall nodejs from Programs & Features with the uninstaller.
2. Delete these files:
   • C:\Program Files (x86)\Nodejs
   • C:\Program Files\Nodejs
   • C:\Users\{User}\AppData\Roaming\npm
   • C:\Users\{User}\AppData\Roaming\npm-cache
   • C:\Users\{User}\.npmrc (and possibly check for that without the . prefix too)
3. Reboot, for good measure
4. Try too install node.js again
5. Try too nmp install to destination repository

Good luck... with what I mentioned above, I was able to solve the problem with my setup.

来源：https://stackoverflow.com/questions/57194920/cant-install-express-because-npm-install-express-error