Issue with Heroku deployment: Express module not detected

I'm currently facing an issue while trying to deploy my Node.js app that includes some getter and setter functions. Despite selecting the Node.js environment on Heroku and providing all necessary environment variables, I keep encountering errors related to Express.

Jul 24 10:18:04 PM  node:internal/modules/cjs/loader:949
Jul 24 10:18:04 PM    throw err;
Jul 24 10:18:04 PM    ^
Jul 24 10:18:04 PM  
Jul 24 10:18:04 PM  Error: Cannot find module 'express'
Jul 24 10:18:04 PM  Require stack:
 - /opt/render/project/src/index.js
Jul 24 10:18:04 PM      at Module._resolveFilename (node:internal/modules/cjs/loader:946:15)
Jul 24 10:18:04 PM      at Module._load (node:internal/modules/cjs/loader:787:27)
Jul 24 10:18:04 PM      at Module.require (node:internal/modules/cjs/loader:1012:19)
Jul 24 10:18:04 PM      at require (node:internal/modules/cjs/helpers:102:18)
Jul 24 10:18:04 PM      at Object.<anonymous> (/opt/render/project/src/index.js:1:17)
Jul 24 10:18:04 PM      at Module._compile (node:internal/modules/cjs/loader:1112:14)
Jul 24 10:18:04 PM      at Module._extensions..js (node:internal/modules/cjs/loader:1166:10)
Jul 24 10:18:04 PM      at Module.load (node:internal/modules/cjs/loader:988:32)
Jul 24 10:18:04 PM      at Module._load (node:internal/modules/cjs/loader:834:12)
Jul 24 10:18:04 PM      at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) {
Jul 24 10:18:04 PM    code: 'MODULE_NOT_FOUND',
Jul 24 10:18:04 PM    requireStack: [ '/opt/render/project/src/index.js' ]
Jul 24 10:18:04 PM  }
Jul 24 10:18:04 PM  
Jul 24 10:18:04 PM  Node.js v18.5.0

Package.json

{
  "name": "linktree_back",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node index.js --ext js",
    "dev": "nodemon index.js --exec 'npm start -s"
  },
  "dependencies": {
    "@sendgrid/mail": "^7.7.0",
    "axios": "^0.27.2",
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.20.0",
    "dotenv": "^16.0.1",
    "express": "^4.18.1",
    "express-validator": "^6.14.1",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^6.3.5",
    "mongoose-unique-validator": "^3.1.0",
    "node": "^18.5.0"
  },
  "keywords": [
    "example",
    "heroku"
  ],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "nodemon": "^2.0.19"
  }
}

To import Express in index.js, I use this line of code: 

const express = require("express");

along with the server setup

mongoose
  .connect(process.env.MONGO_URL)
  .then(() => {
    app.listen(process.env.PORT || 5000);
  })
  .catch((err) => {
    console.log(err);
  });
node.jsexpressherokuweb-deploymentmern

Answer №1

Ensure you have all the necessary dependencies installed by running npm install to check for any missing packages specified in your package.json file. Afterward, proceed to deploy your application to Heroku. If you are aware that you are only lacking the express module, you can manually install it using the command:

npm install express

The reason your app is unable to locate the express module is because it has not been installed.

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