August 11, 2021Moving from Angular to React
The first JavaScript framework that I ever used was Backbone.js. Coming from the spaghetti world of prototype.js and jQuery, it was incredible to use a MVC framwork for the first time. A whole class of bugs was eliminated and building larger applications became increasingly possible.
In my first job, I inherited an ASP.NET application that was grown long in the tooth. Users were expecting snappy, modern interactions, but requiring a postback for every interaction didn't support this paradigm. One of my first major decisions was to begin a migration to AngularJS version 1. At the time, it was Google's premier JavaScript framework offering, and it felt like magic. I spent a few years on this application, but then Angular 2 released. It was better in every way, but not backwards compatible. I started on another migration, but at this point, Angular had a serious competitor in React.
Like my own journey, frontend teams eventually reach a point where they reevaluate their tech stack. Maybe the product has evolved, the hiring market has shifted, or the team wants a lighter, more flexible framework. Whatever the reason, many organizations make the jump from Angular to React.
If you're considering that move, this post breaks down what the transition looks like, what to expect, and how to make the switch without disrupting your workflow.
Why Teams Move From Angular to React
Angular is a powerful, full-featured framework. It gives you a complete, batteries-included experience. But that comes with tradeoffs including complexity, opinionated architecture, and a steeper learning curve.
React, on the other hand, is a flexible UI library. It focuses on components and leaves architectural choices to the team. That freedom is one of the most common reasons companies migrate. Here are some other reasons I found in support of migration.
1. A simpler mental model
React's component model is easier to understand. Instead of dealing with modules, decorators, dependency injection, and templates, React keeps things closer to JavaScript and JSX.
2. A larger talent pool
It is easier to hire React developers. The community is bigger, and many new engineers learn React first. "Everybody is doing it" isn't always a good reason, but in software engineering, it often is.
3. Faster iteration
React's lightweight structure lets teams evolve their codebase without fighting against framework constraints. You choose your routing, state management, and build tools.
4. Ecosystem flexibility
React plays well with a huge ecosystem of libraries, which makes it easier to pick solutions that match your team's style and product needs.
Differences to Expect When Switching
A migration means your team will adjust to new patterns. Here are the major changes you'll notice:
Templates vs. JSX
Angular separates HTML templates from component logic. React blends them using JSX, which lets you write UI logic directly in JavaScript.
Dependency Injection
Angular has a built-in DI system. React does not. Instead, React relies on composition, hooks, and context.
Two-way Binding vs. One-way Data Flow
Angular encourages two-way binding. React encourages predictable, one-way data flow.
Routing and State Management
Angular gives you Angular Router and Angular Services out of the box. In React, you choose tools like React Router, Redux, or Recoil (my personal preference). This freedom is powerful but requires some architectural decisions upfront. If you work on a team, this will also require continual justification of your decisions over time!
Lifecycle Hooks
React hooks (useEffect, useState, useMemo) replace Angular lifecycle methods (ngOnInit, ngOnDestroy, etc.). The concepts map over, but you’ll need to learn the React hook mindset. Some of these are very easy places to write bugs if you're not careful.
A Migration Strategy That Works
Jumping all at once is rarely the right move. Instead, successful teams approach migration gradually.
1. Start by building new features in React
Keep your Angular application running. Introduce React for isolated pieces where possible. This reduces risk and lets your team build React experience while continuing to ship.
2. Use microfrontends or module integration
Tools like Module Federation or a microfrontend setup let you run Angular and React side-by-side. This is often the most practical long-term transition path. Trust me, there is almost zero chance that you will be able to do the migration all at once.
3. Establish coding standards early
Decide on:
- Component patterns
- State management
- Folder structure
- Testing approach
This keeps your new React codebase from becoming a patchwork of different decisions and styles.
4. Prioritize shared components
UI components like buttons, modals, inputs, and layout elements should be developed early. A shared design system gives your React work consistency from day one. Working with an existing component library like React Spectrum is a great way to get started.
5. Train the team
Even experienced Angular developers need time to learn React patterns. Train people early, share examples, and encourage pairing.
What Improves After the Move
Teams typically report several benefits once they're fully on React:
- Faster development cycles
- Less boilerplate
- More straightforward debugging
- Easier onboarding for new engineers
- A more flexible architecture
- A wider library and ecosystem
Final Thoughts
Moving from Angular to React is a strategic decision that touches architecture, culture, and long-term velocity. With a gradual migration plan, clear coding standards, and proper team education, the shift can be (at least somewhat!) smooth and productive. My migrations haven't been easy, but I'd say that they have been worth the investment.
React's simpler model, large community, and flexible ecosystem make it a strong fit for product teams that want to iterate quickly and stay adaptable.