BUFFER is a convenience library for working with strings in C. Mainly, BUFFERs eliminate the need for tracking the string length, thus providing a safe alternative for string operations.

Also, they are super fast in printing and appending data to the string and its buffer_strlen() is just a lookup (it does not traverse the string).

Netdata uses BUFFERs for preparing web responses and buffering data to be sent upstream or to backend databases.