node.js 本地模块：在子文件夹中找不到模块错误

Question

Here is the folder structure of my application

I am refering app_modules/bar and app_modules/foo as local modules

package.json Root folder

 "dependencies": {
    "body-parser": "~1.18.2",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.9",
    "express": "~4.15.5",
    "jade": "~1.11.0",
    "morgan": "~1.9.0",
    "serve-favicon": "~2.4.5",
    "foo": "file:app_modules/foo",
    "bar": "file:app_modules/bar",
    "hello": "file:hello"
  }

when i require the modules as

var fooModule = require('app_modules/foo'); i got module not found error

package.json for foo module

{
  "name": "foo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

Answer 1

By default, require looks for modules inside the node_modules folder. To include modules from a custom locations, you need to prefix the path with ./ or ../ depending the level the module is from the file from where you require it.

So, If you want to require app_modules/foo from app.js , you will have to do:

var fooModule = require('./app_modules/foo');