Why do I obtain this error when deploying app to Heroku?

Question

I am getting some kind of error when deploying my app to heroku using git hub. The problem is, I don\'t understand the heroku logs and the entailing errors. Here is the hero

Answer 1

I also faced similar kind of errors for my node js app while publishing it to heroku.com

First create a procfile, procfile is a simple text file but without any extension.

Place only one line in procfile as of now.

web: npm start

Now create the package.json file using command

npm init

once your package.json file got created please place the start property inside scripts.

"scripts": {
    "start": "node app.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },

now commit all (procfile/package.json) pending files. and deploy app again from heroku.

Answer 2

My silly mistake was that I was pushing the master branch to Heroku while my changes were in another branch!

Make sure that you merge your latest branch with your master branch first

> git checkout master

> git merge your-latest-branch

> git push heroku master

Answer 3

You have to inform heroku where to start : missing script: start. In your package.json, you should have something like this:

"scripts": {
  "start": "node index.js"
}

Where index.js is your entry point.

As an alternative, you can specify in Procfile:

web: node index.js

Answer 4

In my case, changing this:

"scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
    },

to this:

"scripts": {
   "start": "node app.js"
    },

was the solution