Question

我在Heroku上有我的mern堆栈应用程序，以前它可以正常工作，但是现在可以正常部署，但是不能正常工作。

所有API都可以正常工作，但是前端无法渲染。

当我访问主页时会说

/app/client/build/index.html

所有API都可以正常工作

这是我的服务器json包

  "name": "***",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "client-install": "cd client && yarn install ",
    "server": "nodemon app",
    "start": "node app.js",
    "client": "cd client && yarn  start ",
    "dev": "concurrently \"yarn run server \" \"yarn run client\" ",
    "heroku-postbuild": "NPM_CONFIG_PRODUCTION=false &&  cd client && npm install && npm build "
  },
  "repository": {
    "type": "***",
    "url": "***"
  },
  "author": "",
  "license": "ISC",
  "homepage": "***",
  "dependencies": {
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "helmet": "^3.19.0",
    "jimp": "^0.6.4",
    "morgan": "^1.9.1",
    "multer": "^1.4.1"
  },
  "devDependencies": {
    "concurrently": "^4.1.1"
  }
}

这是我给客户的json包

{
  "name": "***",
  "version": "0.1.0",
  "private": ***,
  "dependencies": {
    "@fortawesome/fontawesome-svg-core": "^1.2.19",
    "@fortawesome/free-brands-svg-icons": "^5.9.0",
    "@fortawesome/free-regular-svg-icons": "^5.9.0",
    "@fortawesome/free-solid-svg-icons": "^5.9.0",
    "@fortawesome/react-fontawesome": "^0.1.4",
    "axios": "^0.19.0",
    "bootstrap": "^4.3.1",
    "file-saver": "^2.0.2",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "react-router-dom": "^5.0.1",
    "react-scripts": "3.0.1",
    "react-toastify": "^5.3.2",
    "reactstrap": "^8.0.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "node-sass": "^4.12.0"
  }
}

在这两个版本中，我都有开发依赖项，在Heroku的后期构建中，我从yarn切换到npm。

这是我在app.js中的路由文件

app.use(express.static(path.join(__dirname, "client", "build")));

app.use("/*", (req, res) => {
  res.send(path.join(__dirname, "client", "build", "index.html"));
});

如果我做错了，请指出。

Answer 1

嗨，我遇到了同样的问题，这是mongodb网络访问问题。我通过以下方法解决了这个问题：登录MongoDB>选择您的项目>网络访问>添加IP地址>单击“允许从任何地方访问”

Answer 2

使用

app.use('*', express.static(path.join(__dirname, "client", "build")))

代替

app.use("/*", (req, res) => {
  res.send(path.join(__dirname, "client", "build", "index.html"));
});

我遇到类似的错误，不知道为什么，但是解决了问题

Mern Stack应用程序在Heroku Local上运行但在部署时无法在线运行

2 个答案: