Question

我正在构建具有Front-React和Backend Express的应用程序。我正在尝试同时运行两者。我在后端编辑了pakage.json文件。我的主文件夹前端和后端文件夹中有两个文件夹。当我尝试运行它时，它给出一个错误。如何解决此错误？谢谢。

    {
  "name": "backend",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "server": "nodemon index.js",
    "client": "cd frontend && npm start",
    "dev": "concurrently \"npm run server\" \"npm run client\""
  },
  "author": "Ezana",
  "license": "ISC",
  "dependencies": {
    "concurrently": "^4.1.0",
    "express": "^4.16.4",
    "nodemon": "^1.18.10"
  }
}




   [0] Error: listen EADDRINUSE: address already in use :::5000
[0]     at Server.setupListenHandle [as _listen2] (net.js:1277:14)
[0]     at listenInCluster (net.js:1325:12)
[0]     at Server.listen (net.js:1412:7)
[0]     at Function.listen (/Users/ezanatesfaye/Desktop/Canvas/backend/node_modules/express/lib/application.js:618:24)
[0]     at Object.<anonymous> (/Users/ezanatesfaye/Desktop/Canvas/backend/index.js:25:5)
[0]     at Module._compile (internal/modules/cjs/loader.js:689:30)
[0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
[0]     at Module.load (internal/modules/cjs/loader.js:599:32)
[0]     at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
[0]     at Function.Module._load (internal/modules/cjs/loader.js:530:3)
[0] Emitted 'error' event at:
[0]     at emitErrorNT (net.js:1304:8)
[0]     at process._tickCallback (internal/process/next_tick.js:63:19)
[0]     at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
[0]     at startup (internal/bootstrap/node.js:283:19)
[0]     at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

Answer 1

那是因为您已经有一个绑定到端口5000的进程。我认为您之前已经运行了相同的东西，并且可能该进程仍被分配了相同的端口。尝试杀死进程 OR 并在其他端口上监听服务器。从此开始，将其添加到服务器端代码：-

yr_rules_scan_mem

并且始终记得通过发送请求const A_PORT = 6000; app.listen(A_PORT, () => console.log(`LISTENING ON PORT ${A_PORT}`));通过CTRL + C正确终止该过程。

Answer 2

杀死您在端口5000中运行的应用程序，或更改节点应用程序的端口。您也可以使用以下配置。

  "scripts": {
    "test": "jest",
    "start": "node index.js",
    "start-dev": "nodemon index.js",
    "client-install": "npm install --prefix client",
    "client": "npm start --prefix ../client",
    "dev": "concurrently \"npm run start-dev\" \"npm run client\""
  },

Answer 3

您可以尝试此npm-run-all --parallel start-dev client

在执行上述脚本之前，请先安装npm-run-all: "^4.1.3"。

或者您可以尝试npm run start-dev && npm run client

如何运行并表达一致？

3 个答案: