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React doesn't offer routing. The React TodoMVC implementation uses Director, a separate library for routing: https://github.com/tastejs/todomvc/tree/gh-pages/architectur...

You can also use something like react-router-component which integrates very easily with React:

The devs that created React are using React + Backbone.Router for Instagram's desktop site.

It's very easy to integrate Backbone.Router into a project.