错误：安装无法读取依赖项-执行命令npm install时

Question

我正在nodejs工作场所的https://ide.c9.io中工作。 在创建工作场所时，c9.io提供了一个用nodejs开发的示例聊天应用程序

为了进一步扩展功能，我想安装mysql模块。 所以我修改了如下的package.json文件，并添加了“ node-mysql”。

{
  "name": "chat-example",
  "version": "0.0.0",
  "description": "A chat example to showcase how to use `socket.io` with a     static `express` server with `async` for control flow.",
  "main": "server.js",
  "repository": "",
  "author": "Mostafa Eweda <mo.eweda@gmail.com>",
  "dependencies": {
    "async": "~0.2.8",
    "express": "~3.2.4",
    "socket.io": "~0.9.14"
  }
} 

{
  "name": "node-mysql",
  "version": "0.0.1",
  "dependencies": {
   "express": "^4.10.6",
    "mysql": "^2.5.4"
  }
}

但这给了我如下错误

npm ERR! install Couldn't read dependencies
npm ERR! Failed to parse json
npm ERR! Unexpected token {
npm ERR! File: /home/ubuntu/workspace/package.json
npm ERR! Failed to parse package.json data.
npm ERR! package.json must be actual JSON, not just JavaScript.
npm ERR! 
npm ERR! This is not a bug in npm.
npm ERR! Tell the package author to fix their package.json file. JSON.parse

npm ERR! System Linux 3.14.13-c9
npm ERR! command "/home/ubuntu/.nvm/v0.10.35/bin/node" "/home/ubuntu/.nvm/v0.10.35/bin/npm" "install"
npm ERR! cwd /home/ubuntu/workspace
npm ERR! node -v v0.10.35
npm ERR! npm -v 1.4.28
npm ERR! file /home/ubuntu/workspace/package.json
npm ERR! code EJSONPARSE
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /home/ubuntu/workspace/npm-debug.log
npm ERR! not ok code 0

让我知道我在做什么。 我用于package.json的JSON格式是错误的。

当我分别使用“聊天示例”或“聊天示例”模块时-它们安装正确。

Answer 1

日志明确提到您的package.json文件无效。 为了添加node-mysql，您所要做的就是将其添加到依赖关系部分，如下所示（编写0.4.2是node-mysql的最新版本，如果需要其他版本，只需指定它即可）：

{
  "name": "chat-example",
  "version": "0.0.0",
  "description": "A chat example to showcase how to use `socket.io` with a     static `express` server with `async` for control flow.",
  "main": "server.js",
  "repository": "",
  "author": "Mostafa Eweda <mo.eweda@gmail.com>",
  "dependencies": {
    "async": "~0.2.8",
    "express": "~3.2.4",
    "socket.io": "~0.9.14",
"node-mysql": "^0.4.2"
  }
} 

Answer 2

清楚地说：

npm ERR! Failed to parse json

表示它不是有效的json。

使其成为有效的JSON。

它是有效的json：

{
  "name": "chat-example",
  "version": "0.0.0",
  "description": "A chat example to showcase how to use `socket.io` with a     static `express` server with `async` for control flow.",
  "main": "server.js",  
  "author": "Mostafa Eweda <mo.eweda@gmail.com>",
  "dependencies": {
    "async": "~0.2.8",
    "express": "~3.2.4",
    "socket.io": "~0.9.14",
"node-mysql": "^0.4.2"
  }
} 

我刚刚修改了@Johnny Tordgeman的帖子