Web Reference: When we develop an Angular app which needs a back end to persist data, the back end is often served on another port of localhost. For example, the URL to the front end Angular app is http://localhost:4200, while the URL to the back end server is http://localhost:3000. Aug 4, 2025 · We’ll cover what’s new, show you how to implement the changes with interactive code examples, and give you the tools to write cleaner, more maintainable code in 2025. When we develop an Angular app which needs a back end to persist data, the back end is often served on another port of localhost. For example, the URL to the front end Angular app is http://localhost:4200, while the URL to the back end server is http://localhost:3000.
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