What is a buffer in Node.js?

A Buffer is a chunk of memory, just like you would have it in C/C++. You can interpret this memory as an array of integer or floating point numbers of various lengths, or as a binary string. Unlike higher-level data structures like arrays, a buffer is not resizable.

It corresponds roughly to:

• char* or char[] in C/C++
• byte[] in Java
• A mutable bytes or a non-resizable bytearray in Python
• Strings in php if they were mutable