The cause:

After reading your post, i know that this is because module request is not publiced in over the world. I have 2 suggests as follow, this is the cause which is getting the error:

 npm install request -g

Whether should this set up it in /usr/loca/bin? because it do not exsit.

sudo npm link /usr/local/lib/node_modules/request -> /Users/soulsonic/dev/sandbox/node_test/request

Terminal was started again after each command but the error is still existed.

The solution:

Access the project directory.

mkdir TestProject
cd TestProject

Make it to your root’s project.

npm init --yes

Set necessary npm modules and save them as project dependencies.

npm install request --save

/* Your code... */

Create a test.js file in project directory with code from package example:

var request = require('request');
request('http://www.google.com', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body); // Print the google web page.
}
});

It must be similarly this:

TestProject/
- node_modules/
- package.json
- test.js

Finally, run Node from your project directory.

node test.js