Uses of intercepting response in Express

• Logging: Capture and log details about incoming requests and outgoing responses for debugging and monitoring purposes.
• Authentication/Authorization: Verify user identity or permissions before allowing access to certain routes.
• Request/Response Modification: Modify requests or responses based on specific requirements or business logic.
• Data Parsing/Transformation: Modify request or response bodies, parse incoming data, or transform it as needed.
• Error Handling: Intercept errors and handle them centrally, providing consistent error responses.
• Security Measures: Implement security measures such as setting HTTP headers for preventing attacks.
• Middleware Organization: Use middleware to organize and modularize code, promoting reusability and maintainability.

In the context of Express , “intercept” usually refers to the process of capturing or modifying a request or response in a middleware function before it reaches its final destination (e.g., a route handler) or before it is sent back to the client.

In Express, intercepting response.send() or response.json() can be achieved by using middleware functions. Middleware functions in Express have access to the request, response, and the next middleware function in the application’s request-response cycle. We can use this feature to intercept and modify the response before it is sent to the client.