NodeJs & UTF-8

Abida Alalawi
2 min readMay 14


UTF-8 is a character encoding system that is widely used in computers and on the internet. It is a variable-length encoding system, which means that it can represent every character in the Unicode character set. UTF-8 has become the de facto standard for encoding text on the web, and it is used by many programming languages and software applications.

When working with Node.js, one of the most common tasks is reading and writing files. The `fs.readFile()` method is used to read the contents of a file asynchronously. When reading a file, it is important to specify the encoding to use. If the encoding is not specified, Node.js will use the default encoding, which is usually UTF-8.

UTF-8 is important because it allows us to represent any character in the Unicode character set, which includes characters from almost every language in the world. This means that we can use Node.js to read and write files in any language, including languages that use non-Latin scripts such as Chinese, Japanese, and Arabic.

To specify the encoding when using `fs.readFile()`, we need to pass the encoding as the second argument to the method. For example, to read a file in UTF-8 encoding, we would use the following code:

In this code, the first argument is the path to the file we want to read, the second argument is the encoding UTF-8 in this case, and the third argument is a call back function that will be called when the file has been read.

It is important to note that when reading and writing files in Node.js, the default encoding is not always UTF-8. For example, when reading and writing binary files such as images or audio files, we would not want to use UTF-8 encoding. In these cases, we would need to use a different encoding, such as `base64`.

In conclusion, UTF-8 is a crucial component of modern computing and the internet, allowing us to represent text in any language and enabling cross-language communication. When working with Node.js, it is important to specify the correct encoding when reading and writing files to ensure that we can work with text in any language. By using the `fs.readFile()` method and specifying the encoding as UTF-8, we can easily read and write text files in Node.js, making it a versatile tool for developers working on projects that require cross-language support.