express limit based on ip

To set an express limit based on IP, follow these steps:

1. Identify the IP address: Determine the IP address of the user who is accessing your system. This can usually be obtained from the HTTP request headers.

2. Define the limit: Decide on the maximum number of requests allowed from a single IP address within a specific time frame. For example, you might choose to limit the requests to 100 per hour.

3. Track requests: Implement a mechanism to track the number of requests made by each IP address. This can be done by maintaining a record or using a database to store the information.

4. Check the request count: Before processing each request, check the request count for the corresponding IP address. If the count exceeds the defined limit, take appropriate action, such as returning an error response or blocking further requests from that IP.

5. Reset the count: Reset the request count for each IP address after the specified time frame has elapsed. This ensures that the limit is enforced consistently and allows legitimate users to make requests again.

By following these steps, you can effectively set an express limit based on IP and prevent excessive or unauthorized usage of your system.