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In this article, the editor introduces in detail "what is the use of buffer in node", the content is detailed, the steps are clear, and the details are handled properly. I hope that this article "what is the use of buffer in node" can help you solve your doubts? let's follow the editor's way of thinking to learn new knowledge.

In node, buffer is used to store binary data in memory, and can be used as a cache area when dealing with TCP streams or file streams, specifically for storing used binary data; nodejs cannot control the time of data transmission, if it is not time to send, the data will be stored in Buffer until the data is sent.

This article operating environment: Windows10 system, nodejs version 12.19.0, Dell G3 computer.

What is the use of buffer in node

In Node applications, we need to deal with network protocols, operate databases, process pictures, receive uploaded files, etc., and in the operation of network streams and files, we have to deal with a large amount of binary data, and Buffer opens up an area in memory (initialized to 8KB for the first time) to store binary data.

In the above operations, there will be data flow, and in each process of data flow, there will be a minimum or maximum amount of data.

If the data arrives faster than the process consumes, then a small number of early data will be in the waiting area waiting to be processed. On the other hand, if the data arrives slower than the data consumed by the process, the data that arrived earlier will have to wait for a certain amount of data to arrive before it can be processed.

The waiting area here refers to the Buffer, which is a small physical unit in a computer and is usually located in the RAM of the computer.

To put it simply, Nodejs cannot control the speed and arrival time of data transmission, and can only decide when to send the data. If it is not yet time to send the data, it will put the data in Buffer, that is, in RAM, until it has been sent.

As mentioned above, Buffer is used to store binary data, and its form can be understood as an array, and each item in the array can hold 8-bit binary: 00000000, that is, a byte.

Defines a Buffer class that is used to create a cache dedicated to binary data

Binary data must be used when dealing with things like TCP streams or file streams. So in Node.js, you define a Buffer class that is used to create a cache dedicated to binary data.

Create a Buffer class

The Node Buffer class can be created in several ways.

Method 1

Create a Buffer instance with a length of 10 bytes:

Var buf = new Buffer (10)

Method 2

Create a Buffer instance from the given array:

Var buf = new Buffer ([10, 20, 30, 40, 50])

Method 3

Create an Buffer instance with a string:

Var buf = new Buffer ("bianchengsanmei", "utf-8")

Utf-8 is the default encoding, and it also supports the following encodings: "ascii", "utf8", "utf16le", "ucs2", "base64" and "hex".

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