Question

我读了很多关于Heroku上的MERN应用程序部署的博客，但是它们都使用单独的package.json用于客户端和服务器！

是否可以使用一个package.json文件？

我的package.json

{
  "name": "ecommerce",
  "version": "0.1.0",
  "private": true,
  "author": "Dweep Panchal",
  "license": "ISC",
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.5.0",
    "@testing-library/user-event": "^7.2.1",
    "braintree-web-drop-in-react": "^1.1.1",
    "concurrently": "^5.2.0",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.4.1",
    "react-stripe-checkout": "^2.6.3",
    "body-parser": "^1.19.0",
    "braintree": "^2.22.0",
    "cookie-parser": "^1.4.5",
    "cors": "^2.8.5",
    "dotenv": "^8.2.0",
    "express": "^4.17.1",
    "express-jwt": "^5.3.3",
    "express-validator": "^6.4.0",
    "formidable": "^1.2.2",
    "jsonwebtoken": "^8.5.1",
    "lodash": "^4.17.15",
    "mongoose": "^5.9.7",
    "stripe": "^8.46.0",
    "uuid": "^7.0.3"
  },
  "scripts": {
    "server": "cd ./backend && node app.js",
    "start": "concurrently \"npm run server\" \"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"
    ]
  },
  "proxy": "http://localhost:8000",
  "devDependencies": {
    "nodemon": "^2.0.3"
  },
  "engines": {
    "node": "10.16.0",
    "npm": "6.9.0"
  }
}

app.js

require("dotenv").config({ path: "../.env" });
const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const cookieParser = require("cookie-parser");
const cors = require("cors");

const app = express();

// Routes
const authRoutes = require("./routes/auth");
const userRoutes = require("./routes/user");
const categoryRoutes = require("./routes/category");
const productRoutes = require("./routes/product");
const orderRoutes = require("./routes/order");
const stripeRoutes = require("./routes/stripepayment");
const braintreeRoutes = require("./routes/braintreepayment");

// DB Connection
mongoose
  .connect(
    `mongodb+srv://${process.env.DB_NAME}:${process.env.DB_PASS}@${process.env.DB_PROJECT}-xi8tq.mongodb.net/${process.env.DB_PROJECT}?retryWrites=true&w=majority`,
    {
      useNewUrlParser: true,
      useCreateIndex: true,
      useUnifiedTopology: true,
      useFindAndModify: true,
    }
  )
  .then(() => console.log("DB Connected!"))
  .catch(() => console.log("Failed to Connect DB"));

// Middleware
app.use(bodyParser.json());
app.use(cookieParser());
app.use(cors());

// My Routes
app.use("/api", authRoutes);
app.use("/api", userRoutes);
app.use("/api", categoryRoutes);
app.use("/api", productRoutes);
app.use("/api", orderRoutes);
app.use("/api", stripeRoutes);
app.use("/api", braintreeRoutes);

// Server Connection
const port = process.env.BACKEND_PORT || 8000;

app.listen(port, () => console.log(`Server Running at Port ${port}`));

当我在heroku上部署此应用程序时，项目URL显示：

无效的主机标头

整个项目： https://github.com/dweep612/ecommerce

Answer 1

让我快速解释一下如何部署任何Reactjs并表达给heroku工作。目标是使用npm run build生成一个构建文件夹，然后启动服务器以从该构建文件夹提供静态内容。

在heroku文档中，它指出heroku-postbuild在启动脚本之前运行。这是执行npm run build生成生成文件夹，然后使用启动脚本运行服务器代码的理想场所。从那里，服务器应使用express.static并指向生成生成文件夹的位置。

这就是为什么人们喜欢使用服务器package.json的原因，因为它不会干扰react start脚本。现在，我立即看到的问题是您没有正确使用脚本，也没有指向您要生成的构建文件夹。

在package.json中，创建一个启动脚本以启动app.js文件，然后创建一个heroku-postbuild来生成构建文件夹。像下面一样

"scripts": {
    "start": "cd ./backend && node app.js",
    "heroku-postbuild": "npm run build",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },

之后，您的app.js中应该有app.use(express.static(<<location of build folder>>))。在您的app.js中添加以下代码

if (process.env.NODE_ENV === "production") {
  app.use(express.static("../build"));
}

我说../build的原因是因为您的build文件夹在后端文件夹之外。

我还检查了您的整个代码，还有其他小的配置问题。例如，如果要部署到heroku，则应使用process.env.PORT

Answer 2

是的，如果后端为您的前端服务是可能的。当您的后端和前端在两个单独的节点程序上运行时，两个package.json很有用。

invalid host headers可能是由于服务器处理标头的方式所致，但是由于您尚未发布minimal reproducible example，因此到目前为止，我们无法为您提供进一步的帮助。

是否可以使用单个package.json在Heroku上托管MERN应用程序？

2 个答案: