Every time I try to deploy my app on Heroku, it keeps crashing with a strange error popping up on the home screen

Here are the logs for my application:

2018-07-19T01:40:27.548845+00:00 app[web.1]: at Object.<anonymous> (/app/node_modules/bcrypt/bcrypt.js:6:16)
2018-07-19T01:40:27.548847+00:00 app[web.1]: at Module._compile (module.js:652:30)
2018-07-19T01:40:27.548850+00:00 app[web.1]: at Module.load (module.js:565:32)
...

Below is the content of my Procfile:

web: node app.js

This is what my app.js file looks like:

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
...
module.exports = app;

Here is a snippet from my package.json file:

{
  "name": "main-accounting-app",
  "version": "1.0.0",
  ...
}

And this is part of the code in my Angular service auth file:

this.http.post('' + this.domain + 'users/register', newUser, {headers: headers}).pipe(map(res => res.json()));

In production, the value of this.domain is an empty string. I have checked all configurations and ports, but I am still facing issues. Running locally using heroku works fine without errors. Any insights or suggestions on how to resolve this issue would be greatly appreciated.

Answer №1

After encountering a similar issue as described in this question on stackoverflow, it became clear that the root cause was due to installing the bcrypt module on a Windows machine and then pushing it to a Linux-based Heroku machine. This mismatch in environments caused the bcrypt dependency to fail.

To resolve this, the solution involved deleting the node_modules folder on the Heroku machine and creating a .gitignore file in the project directory with the following line:

node_modules

Afterwards, executing git add . and pushing to the heroku master branch allowed the Heroku machine to automatically install the necessary dependencies, including bcrypt, for a Linux environment.

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