What does response code 200 indicate in a REST API?

Response code 200 in a REST API indicates "Ok" or "Success." This status code signifies that the request made by the client has been successfully processed by the server. It means that the desired action has been successfully completed, whether it involves retrieving data, creating a resource, or any other operation.

When a client receives a 200 status code, it typically means that the response body will contain the requested information or a confirmation of the action taken, thereby facilitating effective communication between the client and the server. For instance, if a user requests information from an API endpoint and the operation is successful, the response will generally include the requested data along with the 200 status code.

In the context of RESTful APIs, using the correct HTTP status codes is crucial for properly conveying the outcome of requests. Other response codes, such as those that indicate "Not Found" or "Unauthorized access," serve different purposes and represent different outcomes of API interactions. Understanding these codes helps developers and users effectively interpret responses and troubleshoot issues related to API communications.