node.js - Koa-pg Can't find module pg -

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hey i'm trying nodejs koa talk postgres using koa-pg module, keep getting 'can't find module pg' error. i've tried follow koa-pg examples, have come short...so advice on how progress appreciated.

if created app.js file follows:

var koa = require('koa'); var route = require('koa-route'); var koapg = require('koa-pg'); var roads = require('./controllers/roads'); var app = module.exports = koa();  app.use(route.get('/roads/bbox/', roads.bbox));  app.listen(3000); console.log('listening on port 3000');

and created controller file follows:

var credentials = require('../credentials.js'); var environment = credentials.dev;  app.use(koapg('postgres://' + environment.user + '@' + environment.host + ':' + environment.port + '/' + environment.database))  module.exports.bbox = function * bbox(next) {   var result = yield this.koapg.db.client.querypromise('select now()')   console.log('result: ', result)    this.body = result.rows[0].now.toisostring() };

but i'm getting following error:

module.js:338     throw err;           ^ error: cannot find module 'pg'     @ function.module._resolvefilename (module.js:336:15)     @ function.module._load (module.js:278:25)     @ module.require (module.js:365:17)     @ require (module.js:384:17)     @ object.<anonymous> (c:\users\user\documents\restful_koa\node_modul es\koa-pg\index.js:12:27)     @ module._compile (module.js:460:26)     @ object.module._extensions..js (module.js:478:10)     @ module.load (module.js:355:32)     @ function.module._load (module.js:310:12)     @ module.require (module.js:365:17)

this personal project i'd love understand i'm going wrong. cheers

as mentioned in comments:

you need install pg module via npm install pg or npm install pg --save if want save package.json.

the reason need koa-pg has co-pg dependency when install former latter installed. pg not dependency of co-pg , why have install separately.


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