Docker部署Node.js应用遇Cannot find module 'express'错误求助

报错信息 #

recipeapp-server-1  | Error: Cannot find module 'express'
recipeapp-server-1  | Require stack:
recipeapp-server-1  | - /usr/src/app/index.js
recipeapp-server-1  |     at Module._resolveFilename (node:internal/modules/cjs/loader:1142:15)
recipeapp-server-1  |     at Module._load (node:internal/modules/cjs/loader:983:27)
recipeapp-server-1  |     at Module.require (node:internal/modules/cjs/loader:1230:19)
recipeapp-server-1  |     at require (node:internal/modules/helpers:179:18)
recipeapp-server-1  |     at Object.<anonymous> (/usr/src/app/index.js:1:17)
recipeapp-server-1  |     at Module._compile (node:internal/modules/cjs/loader:1368:14)
recipeapp-server-1  |     at Module._extensions..js (node:internal/modules/cjs/loader:1426:10)
recipeapp-server-1  |     at Module.load (node:internal/modules/cjs/loader:1205:32)
recipeapp-server-1  |     at Module._load (node:internal/modules/cjs/loader:1021:12)
recipeapp-server-1  |     at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:142:12) {
recipeapp-server-1  |   code: 'MODULE_NOT_FOUND',
recipeapp-server-1  |   requireStack: [ '/usr/src/app/index.js' ]
recipeapp-server-1  | }

相关配置文件 #

Dockerfile #

FROM node

WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install

RUN num install express

COPY . .

EXPOSE 3000

CMD ["node", "index.js"]

注：添加或移除RUN npm install express结果一致

docker-compose.yml #

version: '3.9'

services:
  server:
    volumes:
      - /usr/src/app/node_modules
    build: .
    ports:
      - '3001:3000'
  db:
    image: 'postgres'
    ports:
      - '4444:5432'
    environment:
      POSTGRES_USER: 'postgres'
      POSTGRES_PASSWORD: 'root'

注：添加或移除volumes结果一致

package.json #

{
  "name": "recipeapp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.18.3",
    "pg": "^8.11.3"
  }
}

已尝试的解决方法及结果 #

• 在Dockerfile中添加/移除RUN npm install express，并在docker-compose.yml中添加/移除volume：均无效
• 移除package-lock.json：问题仍存在
• 在server服务下添加node_process: container_name: container_node restart: unless-stopped并修改volumes配置：出现新错误validating C:\Path\RecipeApp\docker-compose.yml: services.server Additional property node_process is not allowed
• 修改Dockerfile中的WORKDIR和COPY指令，同时修改docker-compose.yml的volumes配置：问题仍存在

期望结果 #

应用能正常启动且无报错

解决方案 #

1. 修复Dockerfile拼写错误：
   当前Dockerfile里的RUN num install express是拼写错误，应为RUN npm install express。不过由于package.json已包含express依赖，这一行可直接删除，仅保留RUN npm install即可安装所有依赖。修改后的Dockerfile如下：

   FROM node
   
   WORKDIR /usr/src/app
   
   COPY package*.json ./
   
   RUN npm install
   
   COPY . .
   
   EXPOSE 3000
   
   CMD ["node", "index.js"]
   

2. 清理旧镜像缓存并重新构建：
   执行以下命令彻底清理旧构建缓存、容器及镜像，再重新启动服务：

   docker compose down --volumes --rmi all
   docker compose build --no-cache
   docker compose up
   

3. 可选：优化volumes配置（本地开发场景）：
   若需本地开发时挂载代码目录且不覆盖容器内依赖，可将volumes调整为：

   volumes:
     - .:/usr/src/app
     - /usr/src/app/node_modules
   

   无需本地挂载则直接删除volumes配置，避免干扰容器内依赖安装。

内容的提问来源于stack exchange，提问作者Hin