node.js - how to install new nodejs modules to expressjs project? -

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currently working on online yaml code editor. use expressjs framework it. want install yamljs module it. how install it? because following code line cause error.

var yaml = require('yamljs');

this code segment

var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var logger = require('morgan'); var cookieparser = require('cookie-parser'); var bodyparser = require('body-parser');   var routes = require('./routes/index'); var users = require('./routes/users');  var yaml = require('yamljs');  var app = express(); // view engine setup app.set('views', path.join(__dirname, 'views')); app.set('view engine', 'jade');

this error

error: cannot find module 'yamljs'     @ function.module._resolvefilename (module.js:338:15)     @ function.module._load (module.js:280:25)     @ module.require (module.js:364:17)     @ require (module.js:380:17)     @ object.<anonymous> (/home/tharindu/documents/projects/group project2/cuubezfinal/app.js:12:12)     @ module._compile (module.js:456:26)     @ object.module._extensions..js (module.js:474:10)     @ module.load (module.js:356:32)     @ function.module._load (module.js:312:12)     @ module.require (module.js:364:17)

i use webstorm coding. have installed yamljs module using 

npm install yamljs
library using if run code manually ubuntu terminal. when run expressjs project, gives above error.

could provide more information error text?

have tried

npm install yamljs

to make module accessible node environment?


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