Error while deploying mean stack application in heroku - heroku

Question

I have tried deploying mean stack application to Heroku, but when I visit the URL:
https://rocky-coast-36852.herokuapp.com/%20deployed%20to%20Heroku
It's showing the error:
Cannot GET /%20deployed%20to%20Heroku
Also while trying to connect to mongoose database it showing the error:
error in database connectonMongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
(node:42332) DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html
Here is my GitHub link:
https://github.com/saisreereddy/MyFirstApp
Can someone please identify where I doing wrong?
Any kind of help is highly appreciated.

Answer 1

This line would seem to be the cause of your problem:
mongoose.connect('mongodb://localhost:27017/contactlistapp');
Presumably, your database is not running on your Heroku dynos and you're using a Heroku hosted database add-on, like MLab. (If not, provisioning a Mongo add-on is the first step in your solution.) When this add-on is added to your application, it will set an environment variable like DATABASE_URL (refer to add-on documentation), which will contain the database url, username, password, etc.
You'll want to change that line above in app.js to pull that value from the environment using something like mongoose.connect(process.env.DATABASE_URL);, which should just work on Heroku.
Now, you'll also need to set that environment variable locally, using the value you currently have hardcoded in app.js. I'd suggest using dotenv to handle setting the local env vars. If you do use dotenv, be sure to add .env to your .gitignore file.