node.js找不到模块'mongodb' [英] node.js cannot find module 'mongodb'

问题描述

我正在完成我的第一个node.js项目.我已经安装了mongodb，有一个server.js文件，当我尝试运行它时，出现此错误

I am going through my first node.js project. I've installed mongodb, have a server.js file, and when I try to run it I get this error

module.js:340
    throw err;
         ^
Error: Cannot find module 'mongodb'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)

我敢肯定我已经安装了mongodb，我是来自C#Windows背景的UNIX新手，但是我认为这是未正确配置的路径吗?

I am quite certain I have mongodb installed, I am new to unix coming from a C# windows background, but I think this is a path not being configured properly?

推荐答案

所收到的错误表明未正确安装MongoDB的NPM软件包.

The error you are getting indicates that the NPM package for MongoDB is not correctly installed.

此处的解决方法取决于您计划如何利用NPM. NPM软件包管理器的操作具有两种不同的操作模式:本地和全局.

The fix here depends on how you plan to leverage NPM. The NPM package manager operates has two different modes of operation: local and global.

第一种(和默认)模式是本地".

The first (and default) mode is "local".

如果使用server.js转到文件夹，将看到一个名为node_modules的子文件夹.在该文件夹下将是一个mongodb文件夹.如果该文件夹不存在，则mongodb模块未安装在该路径上.

If you go to the folder with server.js you will see a sub-folder named node_modules. Under that folder will be a mongodb folder. If that folder is not present, then the mongodb module is not installed on that path.

要更正此问题，请cd到该文件夹​​，然后键入npm install mongodb.完成该过程后，您应该具有node_modules/mongodb文件夹.

To correct this, cd to that folder and type npm install mongodb. When the process is done you should have the node_modules/mongodb folder available.

您还可以使用npm install -g mongodb在全球范围内安装MongoDB软件包.如果您使用大量的node.js命令行工具，这将很有用，但如果要部署整个工具，则将没有太大用处.

You can also install MongoDB package globally using npm install -g mongodb. This is useful if you are using lots of node.js command-line stuff, but less useful if you are deploying the whole thing.

旁注:package.json周围有一个不断发展的标准. package.json是包括给定模块的所有依赖项的标准化方法.这使您可以在项目/程序包的根目录下运行npm update或npm install，并有效地拉入"所有依赖项.这大大简化了部署过程以及保持依存关系在线的过程.

Side Note: there is an evolving standard around package.json. The package.json is a standardized way of including all dependencies for a given module. This allows you to run npm update or npm install at the root of a project / package and effectively "pull in" all of the dependencies. This greatly simplifies the deployment process and the process of keeping your dependencies in-line.

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