fs module - fs.write

fs.writeFile(): 

The fs.writeFile() method replaces the specified file and content if it exists. If the file does not exist, a new file, containing the specified content, will be created.

Syntax:

fs.writeFile(path, data, options, callback);

    const fs = require("fs");

    fs.writeFile(

      "paper.txt",

      "Hello world!",

      err => {

        if (err) throw err;

        console.log("success");

      }

    );

Using buffer
fs.write(fd, buffer, offset, length, position, callback)
Using string
fs.write(fd, string, position, encoding, callback)

Parameters: The method accepts the following parameters as mentioned above and described below:

• fd: A file descriptor the value returned by opening the file using the fs.open() method. It contains an integer value.
• buffer: It contains the buffer type values like Buffer, TypedArray, and DataView.
• offset: It is an integer value that determines the part of the buffer to be written to the file.
• length: It is an integer value that specifies the number of bytes to write into the file.
• position: It is an integer value that holds the position that refers to the offset from the beginning of the file where the data is to be written.
• callback: It contains a callback function that receives an error and the number of bytes written to the file.
• string: Write a string to the file specified by fd.
• encoding: The default encoding value is UTF-8.

fs.writeFileSync():

Syntax:

fs.writeFileSync(path, data, options);

    const fs = require("fs");

    try {

      fs.writeFileSync("mozahed.txt", "Mozahedul Islam is a well-known programmer");

    } catch (err) {

      if (err) throw err;

    }