部署Node.js程序至Heroku/RedHat Openshift Online时遇模块找不到错误

Hey there, let's work through this "Cannot find module './dnssec'" error together. Here are actionable steps to resolve the issue based on your environment (npm@5.6.0, node@v8.9.4, production mode):

1. Reinstall Dependencies Completely #

Old versions of npm (like 5.6.0) sometimes leave incomplete or corrupted dependency installations. Let's start fresh:

# Delete existing dependencies and lock file
rm -rf node_modules package-lock.json
# Reinstall all dependencies
npm install

This ensures every required package (including any that might include the dnssec module) is installed properly.

2. Verify the dnssec File/Folder Exists #

The error means Node.js can't locate ./dnssec relative to your main.js file. Check:

• Navigate to the directory where main.js is located. Is there a dnssec.js file, or a folder named dnssec containing an index.js file?
• Double-check the import path in main.js—Linux systems are case-sensitive, so make sure the spelling/capitalization matches exactly (e.g., ./Dnssec vs ./dnssec will fail).
• If this is a third-party module (not your own code), it's likely a sub-dependency of one of your packages. If reinstalling didn't fix it, try updating the parent package that should include dnssec.

3. Install All Dependencies (Including Dev Dependencies) #

Since you're running in NODE_ENV=production, npm skips installing devDependencies by default. If dnssec was mistakenly added to devDependencies but is required for production, run:

npm install --production=false

This forces npm to install all listed dependencies, regardless of environment.

4. Clear npm Cache #

Corrupted cache can cause installation issues in older npm versions. Let's clear it before reinstalling:

npm cache clean --force
rm -rf node_modules package-lock.json
npm install

If none of these steps work, double-check your package.json to ensure all required dependencies are listed, and confirm that the module path in your main.js import is correct.

内容的提问来源于stack exchange，提问作者Yukinoe