How to Replace localhost:3000 With a Custom Local Domain for Development

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Developers often use http://localhost:3000 during local development, but it can cause issues with cookies, OAuth redirect allowlists, webhook URLs, and multi-app setups. A custom local domain such as myapp.test can be configured by adding a single line to the system's hosts file, mapping 127.0.0.1 to the chosen hostname. The .test TLD is recommended as it is reserved for testing purposes and avoids conflicts with real DNS names. For port-free URLs or HTTPS support, a reverse proxy like Caddy, nginx, or Traefik can be placed in front of the local server. This approach brings local development closer to production behavior, particularly for cookie domains and CORS configuration across multiple services.

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