A monorepo is a single repository that holds multiple projects or applications. Think of it as one big folder on your computer that contains several smaller project folders. Instead of having separate repositories for each project, you keep everything together in one place.
Many large tech companies use monorepos to manage their code. But what exactly is a monorepo, and when should you consider using one for your web design projects? Understanding monorepos can help you make better decisions about organizing your code and streamlining your development process.
In this guide, we’ll explore what monorepos are, their benefits and drawbacks, and when they make the most sense for your projects. Whether you’re a solo developer or part of a team, this information will help you decide if a monorepo approach fits your needs.
Understanding Monorepos: The Basics
A monorepo, short for “monolithic repository,” stores multiple related projects in a single version control repository. Unlike traditional approaches where each project lives in its own separate repository, monorepos group everything together.
Imagine you’re building a website with three parts: a main website, a mobile app, and an admin dashboard. In a traditional setup, you’d have three separate repositories. With a monorepo, all three projects live in one repository with organized folders.
Here’s what a typical monorepo structure looks like:
- Main repository folder
- Project A folder (main website)
- Project B folder (mobile app)
- Project C folder (admin dashboard)
- Shared code folder (common components)
- Configuration files
This approach differs from microrepos, where each project has its own separate repository. Both methods have their place in web development, but monorepos shine when projects share code or need to work closely together.
Key Benefits of Using Monorepos
Monorepos offer several advantages that make them attractive for many development teams. Let’s explore the main benefits you can expect.
Simplified Code Sharing
One of the biggest advantages is easy code sharing between projects. When you have common components, utilities, or styles, you can store them in a shared folder. All projects in the monorepo can access this shared code without complex setup processes.
For example, if you create a custom button component, every project in your monorepo can use it immediately. No need to publish packages or manage separate installations.
Consistent Development Environment
Monorepos make it easier to maintain consistent development practices across projects. You can use the same:
- Code formatting rules
- Testing frameworks
- Build processes
- Dependency versions
This consistency reduces confusion and makes it easier for developers to switch between projects. Everyone follows the same standards, which leads to better code quality and fewer bugs.
Common Challenges and Drawbacks
While monorepos offer many benefits, they also come with some challenges you should consider before making the switch.
Repository Size and Performance
As you add more projects to your monorepo, it grows larger. Large repositories can be slow to clone, especially for new team members. Git operations like pulling updates might take longer than with smaller repositories.
However, modern tools and techniques can help manage these performance issues. Many successful companies run very large monorepos without major problems.
Increased Complexity
Managing multiple projects in one repository requires more sophisticated tooling and processes. You’ll need:
- Build systems that understand project dependencies
- Testing frameworks that can run tests for specific projects
- Deployment processes that handle multiple applications
- Permission systems for different team access levels
This complexity can be overwhelming for small teams or simple projects. The overhead might not be worth it if you’re working on unrelated projects or have a small development team.
When Monorepos Make Perfect Sense
Monorepos work best in specific situations. Understanding these scenarios helps you decide if this approach fits your needs.
Multiple Related Projects
If you’re building several projects that share code or work together, monorepos are ideal. Examples include:
- A main website and its mobile app version
- Client-facing app and admin dashboard
- Multiple websites that share design components
- Frontend and backend code that need to stay in sync
When projects depend on each other or share significant amounts of code, keeping them together makes development much smoother.
Team Collaboration Needs
Monorepos excel when teams need to collaborate closely across projects. They make it easy to:
- Review code changes that affect multiple projects
- Coordinate releases across different applications
- Share knowledge and maintain consistency
- Onboard new team members with one setup process
Large organizations often use monorepos because they simplify collaboration between different teams working on related products.
When to Avoid Monorepos
Despite their benefits, monorepos aren’t always the right choice. Some situations work better with separate repositories.
Avoid monorepos when working with completely unrelated projects. If your projects don’t share code and serve different purposes, separate repositories might be simpler. For example, a portfolio website and a completely different client project probably don’t belong in the same monorepo.
Small teams or solo developers might find monorepos unnecessarily complex. The tooling and setup overhead could slow you down more than help you. Simple projects with straightforward requirements often work better with traditional repository structures.
Security requirements might also make monorepos unsuitable. If different projects need different access controls or have varying security requirements, separate repositories offer better isolation and control.
Consider your team’s experience level too. Monorepos require understanding of more complex development workflows. If your team is new to advanced Git workflows or build systems, starting with separate repositories might be easier.
Getting Started with Your First Monorepo
Ready to try a monorepo? Here’s how to get started:
- Choose a monorepo tool like Lerna, Nx, or Rush
- Set up your repository structure with clear project folders
- Configure shared dependencies and build processes
- Establish coding standards and documentation
- Train your team on the new workflows
Start small with just two related projects. This lets you learn the basics without overwhelming complexity. As you get comfortable, you can add more projects and advanced features.
Monorepos can transform how you manage multiple related projects, but they require careful planning and the right tools. Evaluate your specific needs, team size, and project relationships before making the switch. When used correctly, monorepos streamline development and improve collaboration across your entire development workflow.
