Node.js Heroku deploy error 503

Question

I am trying to deploy a Node.js application to Heroku via a Github repo. It is successfully building the app, but when it deploys there is an Application Error -- and the console reports a 503 error

"Failed to load resource: the server responded with a status 503(Service unavailable)"

The resource it is looking for is a "favicon.ico" file. I tried putting it in the root directory, in a ./public folder, and inside a ./static folder inside app/.

This is strange because I wasn't attempting to reference this file at all in my initial deployment (this is for a class project, and I am trying to set stuff up) and this error still occurred then. I am feeling like Heroku is expecting this file to be somewhere else, but I can't find any sort of mold or pattern to where its expecting this favicon to be. Can anyone point me in the right direction? Regards.

Answer 1

first check start in packege.json if you use nodemon change nodemon to node and add node engine in packege.json file.

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node index.js"
},
"engines": {
    "node": "12.19.0"
},