Heroku - 11 Introduction Heroku Pipelines
Welcome to this introduction to Heroku Pipelines. So far we have always seen how to deploy a single application to Heroku. That works, but it is far from enough in real life. Imagine an app used by thousands of people: you push a code change directly to it, discover a bug that makes the app crash, and now your users are stuck on a broken platform. The other classic problem is having several developers editing the same files at the same time, with conflicting changes. The clean answer is to have several applications sharing the same codebase but playing different roles: some for testing, one for staging, and a final one called production that is the one users actually reach. Heroku Pipelines is exactly that solution.
From idea to production
The natural path of a change is: someone has an idea, the idea is turned into a development task, a developer writes code on their laptop, and at some point that code is ready to be deployed. Heroku Pipelines is what helps moving from development to deployment as quickly and safely as possible. Heroku cannot write the code for you, but it can remove the tedious deployment work around it.
Development happens mostly on the developer's machine, but right after that — and before going to production — we need to see how the code behaves in a real Heroku environment. Heroku makes this easy: in a few minutes you can spin up a test application with pre-built configurations, copy the production config vars (database URLs, secrets, etc.) in seconds, and reproduce the production environment closely enough to validate the change. The goal is to let developers test, experiment and make the new code available for review quickly.
On the staging or production side, the philosophy is slightly different. The code is already validated against the test apps, but we still need to make sure the new version did not break existing features. Heroku CI can run an automated test suite on every push: if all tests pass, the new code can be promoted; if any test fails, the code is not validated and is not promoted, which acts as a safety net against pushing breaking changes.
In the Heroku dashboard, we open a pipeline and see two columns: the development side where new app versions live, and the production side that users actually hit. We create a first application and add it to the pipeline; we can keep several apps in the same column at the same stage. Then we connect the pipeline to a GitHub repository, which unlocks Review Apps: every pull request can spin up its own temporary app, be tested, and be deleted once merged. All these applications share roughly the same codebase — production is just the most stable version, while the others are in active development. Each team has its own merge strategy for promoting code from one stage to the next, and there are many proven workflows online to inspire yours.
Summary
Heroku Pipelines is a solution that enables developers to manage multiple application environments throughout the development lifecycle. This lesson explains why pipelines are essential for teams—preventing bugs from reaching production users, managing code changes across multiple developers, and enabling safe deployment workflows. The video demonstrates how Heroku simplifies this process by allowing rapid creation of staging, testing, and production environments, plus Review Apps for testing pull requests before merging.
Key points
- Pipelines are necessary to prevent production crashes and user disruption when deploying code changes
- Development workflow follows a clear path: local development → testing environment → staging → production
- Heroku enables quick creation of test applications with pre-built configurations and shared environment variables
- Review Apps allow developers to test changes in isolated environments before merging to production
- Multiple environments (development, staging, production) ensure code is validated before reaching users
- Automated testing gates prevent unstable code from being deployed to production applications
FAQ
Why do we need Heroku Pipelines instead of deploying directly to production?
Direct production deployment risks causing crashes and issues for thousands of active users. Pipelines provide testing environments where developers can verify code changes work correctly before releasing to production, preventing bugs and unexpected problems from affecting users.
What problem do Heroku Pipelines solve when multiple developers work together?
When multiple developers modify the same codebase simultaneously, conflicts and issues arise. Pipelines provide separate development, staging, and production applications, allowing teams to manage code changes safely and prevent broken code from reaching production users.
How do Review Apps help in the development workflow?
Review Apps create temporary testing environments from pull requests, allowing developers to test changes in isolation before merging. After testing, the Review App is deleted, keeping the workflow clean and efficient without affecting the main application environments.