Api Mock Server

This walks you through setting up mock API servers using MSW or json-server, which is exactly what you need when you're building a frontend before the backend exists or writing tests without hitting real endpoints. The MSW examples are solid, covering both browser and Node setups with typed handlers, test overrides, and even GraphQL mocking. The json-server section shows the quick REST API approach with custom middleware for things like auth. It's pretty comprehensive on the mechanics, though you'll need to adapt the patterns to your actual API contracts. The fixture factory section gets cut off, but there's enough here to get mocking running in an afternoon.