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Proxy To An API Server In Development With CRA

create-react-app is a great way to bootstrap a React project, especially if you are building a single-page app. When building an SPA, you more likely than not will have a backend API that you interact with.

You can set up your React app to interact with that backend API server in development using the proxy configuration in package.json.

// package.json
  ...
  "proxy": "http://localhost:4000",
}

This will allow you to keep your API calls nice and clean.

fetch("/api/session", ...

No need to manage some sort of host URL environment variable.

Additionally, this will remove an CORS issues because the webpackDevServer will be proxying any paths that it doesn't recognize to the host and port that you've specified.

See the create-react-app docs for more details.