How to install ExpressJS and other libraries (for node.js)

[DDang1]

Hi guys,

My board is already run opkg update.

I have a problem with installing ExpressJS. First, I have some nodejs code that use Express module. So I installed the library on by system:

root@edison:~# npm install express

The installation seem to be good with no error. But when I run my project:

root@edison:/media/sdcard/SocketIO-001# node main.js (my project folder is located on the sdcard)

There is an error: Cannot find module 'express'

I think the problem is that I installed the module in the wrong place, so I change the directory to "/media/sdcard/SocketIO-001" and reinstall the module. But this time, there is a problem:

root@edison:/media/sdcard/SocketIO-001# npm install express --save

npm ERR! Linux 3.10.98-poky-edison+npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install" "express" "--save"npm ERR! node v4.4.3npm ERR! npm v2.15.1npm ERR! path ../mime/cli.jsnpm ERR! code EPERMnpm ERR! errno -1npm ERR! syscall symlinknpm ERR! Error: EPERM: operation not permitted, symlink '../mime/cli.js' -> '/media/sdcard/SocketIO-001/node_modules/express/node_modules/send/node_modules/.bin/mime'npm ERR! at Error (native)npm ERR! { [Error: EPERM: operation not permitted, symlink '../mime/cli.js' -> '/media/sdcard/SocketIO-001/node_modules/express/node_modules/send/node_modules/.bin/mime']npm ERR! errno: -1,npm ERR! code: 'EPERM',npm ERR! syscall: 'symlink',

npm ERR! path: '../mime/cli.js',

npm ERR! dest: '/media/sdcard/SocketIO-001/node_modules/express/node_modules/send/node_modules/.bin/mime' }npm ERR!npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:

npm ERR! /media/sdcard/SocketIO-001/npm-debug.log

I got stuck now. Please help me. Thanks alot!

[idata · Accepted solution]

Hi NewMech,

I would love to help you with your issue.I think that you should run the command using the save flag:npm install express --saveIf you don't use this flag you will install you won't add it to the dependencies.Personally, I recommend you to copy your code to the Edison and install express and run the code in the same directory, not in the SDcard.You can also check this guide for a similar example: https://medium.com/@monkeytypewritr/control-your-intel-edison-in-realtime-with-websockets-f16e49b2b2... .pmk0001cfI hope you find this helpful.Regards,-Leonardo

[DDang1]

Ok, the problem is now solved, But I still put my code in the sd card. It run perfectly. It's so strange that the "node_module" directory is not on the SDcard but the code still work!

Instead of using --save flag, I use: sudo npm install express --g.

[idata]

Hi NewMech,

That's great. Thank you for letting us know.Feel free to contact us when you have issues.Regards,-Leonardo