node Error: Most middleware (like session) is no longer bundled with Express and must be installed

今天的express项目连接mongodb数据库的时候，报了上面的错。大概的意思就是说大部分的中间件（像session）这样的不再跟express一起安装了。找了一些答案，如下：

答案：在express 4.0之前的版本，像session之类的中间件是伴随express自动安装的，我使用的express版本正是4.0之后的版本，所以你们在使用4.0及其之后版本的时候一定要注意这点。

解决方法：在命令行中输入npm install express-session --save，安装express-session的中间件，接着在使用的模块中加入：

使用的时候不再使用express.session,而是直接使用session()，如：

我做完了上面的之后，又报了一个错：

Connection strategy not found这说明new MongoStore 里面包的应该要是个 url 所以应该改成: new MongoStore: { url: 'your_db_url'}解决方法：

转载于:https://www.cnblogs.com/niyi/p/8269300.html

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