NodeJS app builds with Heroku, but it shows application error

Question

I am setting up a NodeJS Heroku app. I just want an empty app up and running.

My dir includes a package.json and an app.js file.

The Heroku app builds without errors, but then I just get an "application error"-page on the URL (https://nameless-wave-98692.herokuapp.com/).

As far as I can see, everything looks good in the logs:

-----> Node.js app detected
-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NPM_CONFIG_PRODUCTION=true
       NODE_ENV=production
       NODE_MODULES_CACHE=true
-----> Installing binaries
       engines.node (package.json):  6.9.2
       engines.npm (package.json):   unspecified (use default)

       Downloading and installing node 6.9.2...
       Using default npm version: 3.10.9
-----> Restoring cache
       Loading 2 from cacheDirectories (default):
       - node_modules
       - bower_components (not cached - skipping)
-----> Building dependencies
       Installing node modules (package.json)
-----> Caching build
       Clearing previous node cache
       Saving 2 cacheDirectories (default):
       - node_modules
       - bower_components (nothing to cache)
-----> Build succeeded!
       └── (empty)
         !     This app may not specify any way to start a node process
       https://devcenter.heroku.com/articles/nodejs-support#default-web-process-type
-----> Discovering process types
       Procfile declares types     -> (none)
       Default types for buildpack -> web
-----> Compressing...
       Done: 13.4M
-----> Launching...
       Released v4
       https://nameless-wave-98692.herokuapp.com/ deployed to Heroku

Do you see any problems? Am I doing something wrong?

please provide your app.js – Konstantin Kreft Dec 28 '16 at 04:10 — Konstantin Kreft, Dec 28 '16 at 04:10
The app.js can be found here: http://pastebin.com/GhgQfKkJ – davidbograd Dec 28 '16 at 06:09 — davidbograd, Dec 28 '16 at 06:09

score 3 · Answer 1 · answered Dec 28 '16 at 04:28

3

Maybe you need file Procfile

web: node app.js

answered Dec 28 '16 at 04:28

David Hackro

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Thanks David, I added the procfile. It a step in the right direction, but I stillget the error... – davidbograd Dec 28 '16 at 06:24
Yea, it is. It just looks like this: https://nameless-wave-98692.herokuapp.com/. No error to see in the console or elsewhere :/ – davidbograd Dec 28 '16 at 17:34
The log Heroku gives me after the build is here: http://pastebin.com/VwPjTV23 Thank you for taking time to help :-) – davidbograd Dec 28 '16 at 23:38
Ah, if I check the logs through the terminal I actually get an error. See this: http://pastebin.com/gJY6EHv2 The error is the two last lines.There is no problems with my laptop. – davidbograd Dec 28 '16 at 23:54
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Thank you so much David, I got it working now! Do I just move all my code from app.js to server.js now? And delete app.js – davidbograd Dec 29 '16 at 00:22
1

(I made a server.js file, as told in the tutorial.) – davidbograd Dec 29 '16 at 00:24
@davidbograd and in you Procfile you have this line? web: node server.js – David Hackro Dec 29 '16 at 02:50

score 1 · Answer 2 · answered Dec 28 '16 at 04:19

1

Looks like you're missing a Procfile

https://devcenter.heroku.com/articles/getting-started-with-nodejs#define-a-procfile

answered Dec 28 '16 at 04:19

Jim Factor

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Thanks Jim, very useful link. I added the procfile. It's a step in the right direction, but I still get the error... – davidbograd Dec 28 '16 at 06:25

NodeJS app builds with Heroku, but it shows application error

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