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Mern 堆棧應用程序在本地 heroku 上工作但在部署時無法在線工作

[英]Mern stack app working on heroku local but not working online when deploy

我在 Heroku 上有我的 mern 堆棧應用程序,以前它運行良好,但現在部署正常但無法正常工作。

所有 API 都工作正常,但前端沒有呈現。

當我訪問主頁時,它說

/app/client/build/index.html

所有 API 都正常工作

這是我的服務器包 json

  "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"
  }
}

這是我的客戶端 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"
  }
}

在這兩者中,我都有開發依賴項,並且在我的 Heroku 后期構建中從 yarn 切換到 npm。

這是我在 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"));
});

如果我做錯了什么,請指出。

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

代替

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

我遇到了類似的錯誤,不知道為什么,但解決了問題

嗨,我遇到了同樣的問題,這是一個 mongodb 網絡訪問問題。 我是這樣解決的:登錄MongoDB>選擇你的項目>網絡訪問>添加IP地址>點擊“允許從任何地方訪問”

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