Not able to install truffle using npm install -g truffle

Question

I am trying to install truffle and when I run the mentioned command, I get this error:

$npm install -g truffle

npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/truffle

npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules

/usr/local/lib

`-- truffle@4.1.14


npm ERR! Linux 4.15.0-39-generic

npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install" "-g" "truffle"

npm ERR! node v8.10.0

npm ERR! npm  v3.5.2

npm ERR! path /usr/local/lib/node_modules/truffle

npm ERR! code EACCES

npm ERR! errno -13

npm ERR! syscall access


npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/truffle'

npm ERR!  { Error: EACCES: permission denied, access '/usr/local/lib/node_modules/truffle'

npm ERR!   errno: -13,

npm ERR!   code: 'EACCES',

npm ERR!   syscall: 'access',

npm ERR!   path: '/usr/local/lib/node_modules/truffle' }

Answer 1

You need root access to install truffle, run this command as root and in should work:

sudo npm install -g truffle

Answer 2

You'd need root access to install truffle via the terminal.

Here's how to go about it, if you're running on a Windows OS.

Step 1: Run CMD as an administrator. You should find yourself in C:\Windows\system32> The "system32 folder".

Step 2: Run the following command in the terminal and let truffle complete its installation process. Make sure you are connected to the internet and in some cases after installation you'd see some error messages & warnings you can ignore them.

C:\Windows\system32>npm install -g truffle

Step 3:  Review your truffle environment || run "truffle version"

C:\Windows\system32>truffle version
Truffle v5.4.0 (core: 5.4.0)
Solidity v0.5.16 (solc-js)
Node v14.17.3
Web3.js v1.4.0

That's pretty much it on installing truffle in windows OS.

NOTE: You don't need root access before initializing a new truffle project.