部署Node.js电商后端至Render.com时遇模块未找到错误求助

错误日志 #

Oct 19 12:56:30 PM  ==> Starting service with 'npm start'
Oct 19 12:56:33 PM  
Oct 19 12:56:33 PM  > api@1.0.0 start /opt/render/project/src
Oct 19 12:56:33 PM  > node ./server.js
Oct 19 12:56:33 PM  
Oct 19 12:56:34 PM  internal/process/esm_loader.js:74
Oct 19 12:56:34 PM      internalBinding('errors').triggerUncaughtException(
Oct 19 12:56:34 PM                                ^
Oct 19 12:56:34 PM  
Oct 19 12:56:34 PM  Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/opt/render/project/src/Middleware/AuthMiddleware.js' imported from /opt/render/project/src/Routes/ProductRoutes.js
Oct 19 12:56:34 PM      at finalizeResolution (internal/modules/esm/resolve.js:276:11)
Oct 19 12:56:34 PM      at moduleResolve (internal/modules/esm/resolve.js:699:10)
Oct 19 12:56:34 PM      at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:810:11)
Oct 19 12:56:34 PM      at Loader.resolve (internal/modules/esm/loader.js:88:40)
Oct 19 12:56:34 PM      at Loader.getModuleJob (internal/modules/esm/loader.js:241:28)
Oct 19 12:56:34 PM      at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:56:40)
Oct 19 12:56:34 PM      at link (internal/modules/esm/module_job.js:55:36) {
Oct 19 12:56:34 PM    code: 'ERR_MODULE_NOT_FOUND'
Oct 19 12:56:34 PM  }
Oct 19 12:56:34 PM  npm ERR! code ELIFECYCLE
Oct 19 12:56:34 PM  npm ERR! errno 1
Oct 19 12:56:34 PM  npm ERR! api@1.0.0 start: `node ./server.js`
Oct 19 12:56:34 PM  npm ERR! Exit status 1
Oct 19 12:56:34 PM  npm ERR!
Oct 19 12:56:34 PM  npm ERR! Failed at the api@1.0.0 start script.
Oct 19 12:56:34 PM  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Oct 19 12:56:34 PM  
Oct 19 12:56:34 PM  npm ERR! A complete log of this run can be found in:
Oct 19 12:56:34 PM  npm ERR!     /opt/render/.cache/_logs/2022-10-19T11_56_34_819Z-debug.log
Oct 19 12:58:05 PM  ==> Starting service with 'npm start'
Oct 19 12:58:08 PM  
Oct 19 12:58:08 PM  > api@1.0.0 start /opt/render/project/src
Oct 19 12:58:08 PM  > node ./server.js
Oct 19 12:58:08 PM  
Oct 19 12:58:09 PM  internal/process/esm_loader.js:74
Oct 19 12:58:09 PM      internalBinding('errors').triggerUncaughtException(
Oct 19 12:58:09 PM                                ^
Oct 19 12:58:09 PM  
Oct 19 12:58:09 PM  Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/opt/render/project/src/Middleware/AuthMiddleware.js' imported from /opt/render/project/src/Routes/ProductRoutes.js
Oct 19 12:58:09 PM      at finalizeResolution (internal/modules/esm/resolve.js:276:11)
Oct 19 12:58:09 PM      at moduleResolve (internal/modules/esm/resolve.js:699:10)
Oct 19 12:58:09 PM      at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:810:11)
Oct 19 12:58:09 PM      at Loader.resolve (internal/modules/esm/loader.js:88:40)
Oct 19 12:58:09 PM      at Loader.getModuleJob (internal/modules/esm/loader.js:241:28)
Oct 19 12:58:09 PM      at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:56:40)
Oct 19 12:58:09 PM      at link (internal/modules/esm/module_job.js:55:36) {
Oct 19 12:58:09 PM    code: 'ERR_MODULE_NOT_FOUND'
Oct 19 12:58:09 PM  }
Oct 19 12:58:09 PM  npm ERR! code ELIFECYCLE
Oct 19 12:58:09 PM  npm ERR! errno 1
Oct 19 12:58:09 PM  npm ERR! api@1.0.0 start: `node ./server.js`
Oct 19 12:58:09 PM  npm ERR! Exit status 1
Oct 19 12:58:09 PM  npm ERR!
Oct 19 12:58:09 PM  npm ERR! Failed at the api@1.0.0 start script.
Oct 19 12:58:09 PM  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Oct 19 12:58:09 PM  
Oct 19 12:58:09 PM  npm ERR! A complete log of this run can be found in:
Oct 19 12:58:09 PM  npm ERR!     /opt/render/.cache/_logs/2022-10-19T11_58_09_816Z-debug.log

相关代码片段 #

ProductRoutes.js #

import express from "express";
import asyncHandler from "express-async-handler";
import { admin, protect } from "../Middleware/AuthMiddleware.js";
import Product from "../Models/ProductModel.js";

package.json #

{
  "name": "api",
  "version": "1.0.0",
  "description": "",
  "type": "module",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node ./server.js",
    "frontend": "cd frontend && npm start",
    "dev": "concurrently \"npm run frontend\" \"npm run server\"",
    "server": "node ./server.js",
}

问题 #

已在package.json中指定"type": "module"，但仍提示无法找到模块/opt/render/project/src/Middleware/AuthMiddleware.js，可能的原因是什么？

排查方向 #

• 大小写不匹配：Render运行在Linux环境，文件名区分大小写。本地Windows/macOS环境不区分，可能本地文件实际是middleware/Authmiddleware.js，但导入写的是../Middleware/AuthMiddleware.js，导致部署后找不到文件。
• 文件未上传到仓库：检查.gitignore规则，确认AuthMiddleware.js没有被忽略，且已提交到Git仓库中，Render才能拉取到该文件。
• 路径层级错误：确认项目目录结构是否和导入路径匹配。比如Routes和Middleware是否确实是同级目录，若Middleware在其他子目录下，导入路径需要调整。
• 文件名拼写错误：检查实际文件名是否为AuthMiddleware.js，有没有拼写错误（比如少字母、后缀错误）。

内容的提问来源于stack exchange，提问作者muscleheadDeveloper