Each RESTful API operation is a combination of an HTTP request against a URL and an appropriate HTTP method.
When executed, each operation will return a status code, indicating whether the invocation has been successful or not. Successful invocation is indicated by a HTTP 2XX status code, while operations that are not executed correctly indicate this with erroneous status code—4XX if the error is at client side, or 5xx when the server fails to process a valid request.
Having a well-specified API is vital for its adoption. Such specification should not only completely enumerate the status codes of each operation, but should also specify the expected data format, that is, its supported media types.
The following table defines how the Express.js Router will expose the API operations, and it should serve as a reference...
