范围错误 [ERR_SOCKET_BAD_PORT]：端口应 >= 0 且 < 65536. Received NaN

Question

我使用的是Ubuntu 18.04 我试图通过“npm start”运行npm。 我收到上述错误。 任何人都可以帮我解决这个错误。

`

WARNING: Adonis has detected an unhandled promise rejection, which may
  cause undesired behavior in production.
  To stop this warning, use catch() on promises or wrap await
  calls inside try/catch.

RangeError [ERR_SOCKET_BAD_PORT]: Port should be >= 0 and < 65536. Received NaN.
    at lookupAndConnect (net.js:938:13)
    at Socket.connect (net.js:914:5)
    at Object.connect (net.js:162:17)
    at makeConnection (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/connect.js:270:20)
    at makeConnection (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/connect.js:36:7)
    at callback (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/connect.js:260:5)
    at makeConnection (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/connect.js:273:12)
    at connect (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/connect.js:34:10)
    at Pool.connect (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/connection/pool.js:548:3)
    at Server.connect (/home/bhagya/foodmonk/node_modules/mongodb-core/lib/topologies/server.js:498:15)
    at Server.connect (/home/bhagya/foodmonk/node_modules/mongoose/node_modules/mongodb/lib/topologies/server.js:360:25)
    at createServer (/home/bhagya/foodmonk/node_modules/mongoose/node_modules/mongodb/lib/operations/mongo_client_ops.js:350:10)
    at parseFn (/home/bhagya/foodmonk/node_modules/mongoose/node_modules/mongodb/lib/operations/mongo_client_ops.js:245:14)
    at parseHandler (/home/bhagya/foodmonk/node_modules/mongoose/node_modules/mongodb/lib/url_parser.js:134:38)
    at module.exports (/home/bhagya/foodmonk/node_modules/mongoose/node_modules/mongodb/lib/url_parser.js:25:12)
    at deprecated (internal/util.js:71:15)
`

下面是我的环境文件：

`HOST=127.0.0.1
PORT=3333
NODE_ENV=development
APP_URL=http://${HOST}:${PORT}
CACHE_VIEWS=false
APP_KEY=xyavbcd
SESSION_DRIVER=cookie
HASH_DRIVER=bcrypt
DB_CONNECTION=mongodb
MONGO_HOST=localhost
MONGO_PORT=27017
MONGO_USER=
MONGO_PASSWORD=
MONGO_DATABASE=xyz`

Answer 1

首先确保你的

.env

及其初始化，这个问题是由于没有提供redis_host或redis_url或redis_port等引起的...

所以我们应该采取以下步骤：

1. 确保 .env 文件
2. 从.env加载
3. 确保正确设置变量

Answer 2

我通过添加到 Heroku -> MyApp -> Settings -> Config Vars -> REDIS_PORT: 5003 得到了帮助。我还在 .env 文件中指定了此端口。

Answer 3

您必须验证是否已将 .env 文件放置在正确的目录位置。

在我的例子中，我使用了 .dist 文件夹之前的文件夹中的 .env 文件

在此输入图片描述

Answer 4

就我而言，我没有为 PORT 变量分配任何端口号，

还提到端口号应该在此范围内是错误的 - 在此输入图片描述 端口 >= 0 且端口 < 65536