What is Interceptor

What is Interceptor in React.Js and React Native?

An Interceptor in React.Js and React Native is a middleware function that can be used to intercept and modify HTTP requests and responses. Interceptors are commonly used for tasks such as adding authentication tokens to requests, logging network activity, or handling errors globally.

Interceptors in React.Js and React Native are typically implemented using libraries such as Axios or Fetch. These libraries provide a way to define interceptor functions that can be executed before a request is sent or after a response is received. Interceptors can be chained together to create complex workflows for handling network requests.

One common use case for interceptors in React.Js and React Native is to add authentication headers to every outgoing request. This can be done by creating an interceptor function that adds the necessary headers to the request object before it is sent. This ensures that all requests are authenticated without having to manually add headers to each request.

Another use case for interceptors is to handle errors globally. By creating an error interceptor, developers can intercept any error responses from the server and handle them in a consistent way. This can help to improve the user experience by providing meaningful error messages and handling errors gracefully.

Interceptors can also be used for logging network activity. By creating a logging interceptor, developers can log information about each request and response, such as the URL, method, status code, and response time. This can be useful for debugging network issues and monitoring network performance.

In summary, interceptors in React.Js and React Native are powerful tools for intercepting and modifying network requests and responses. They can be used for tasks such as adding authentication headers, handling errors globally, and logging network activity. By using interceptors, developers can create more robust and maintainable network code in their React.Js and React Native applications.