It was a beautiful afternoon and the time was 2:17 pm. The sun was radiating hot and the rays of the sun were freely flashing into the room where I was coding.
By 2:30 pm I had completed the code for my CRUD todo-list which was ready for deployment according to my level of understanding.
I logged in to Heroku which is a platform as a service (PaaS) that enables developers to build, run, and operate applications entirely in the cloud. Some months ago, I deployed a Node.js app on the platform so I decided to follow the documentation created for deploying an existing application to Heroku.
After following the documentation cautiously, I got lost then I decided to Google search with the query:
How to solve Heroku H10 error
Before this, I already searched MDN Docs for 503 error which was reported to be Service Unavailable which meant my server wasn't ready to handle a request.
From the result I got from my Google search, I was led to Heroku docs on their errors which was just about the error with nothing to solve it --as-expected.
But with the search I did on 503 and H10, it was clear to me that the only thing causing the error was my code. I searched for How to solve the Heroku H10 error again but with faith, this time and I found a blog post on Dev which listed in detail all I needed to do.
Following this post, I did this:
- Bug in Procfile
I made sure there was no bug in my Procfile since a little space could trigger Heroku errors.
web: node app.js not web : node app.js
- Set Heroku's PORT
I reviewed my code making sure I had set the right Heroku port for Express servers which is process.env.PORT
app.listen(process.env.PORT || 3000, function () {
console.log("The server has started successfully");
});
- Required Environment Variable
The app I created had a database and I didn't set my database URI on Heroku. All I had to do was get my Database's URI and enlist it as a Config Variable on Heroku.
- Set Start Scripts
I didn't have my start script in my package.json which might have caused the app to crash so I added it to be on the safer side.
"scripts": {
"start": "node app.js"
}
I had already set my node engine and I was good to go.
"engines": {
"node": "16.14.2"
}
Finally, I did the rituals git add ., git commit -m "msg" and heroku push origin main which pushed my code to its Heroku repo.
After all the drama, I restarted my dyno with heroku restart and my site was working. I became the happiest man alive at that moment.
THE END
I hope you solve your Heroku H10 error successfully. Follow me on Twitter @ EfeCollins7. I would like to hear your comments. Thanks.
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