What are the parameters for nodejs to write to files?

The write parameters of the fs.writeFile() method in Node.js include: File path: the absolute or relative path of the file to be written. Data: The data to be written to the file (String, Buffer, or array of data blocks). Options (optional): Contains the following optional attributes: encoding: data encoding (default is 'utf8') mode: file permission mode (default is 0o666) flag: flag when opening the file (default is 'w')

Node.js file writing parameters

Use in Node.jsfs.writeFile() When the method writes a file, you can pass the following parameters:

1. File path

Specify the path of the file to be written. Can be an absolute path or a relative path relative to the current working directory.

2. Data

The data to be written to the file. Can be a string, Buffer, or array containing chunks of data.

3. Options (optional)

A JavaScript object containing optional configuration. Can include the following attributes:

• encoding: Data encoding, default is 'utf8'.
• mode: File permission mode, default is 0o666.
• flag: Flag when opening the file, default is 'w' (overwrite).

Example:

const fs = require('fs');

fs.writeFile('myFile.txt', 'Hello world!', (err) => {
  if (err) throw err;
  console.log('File written successfully.');
});

// 使用选项
fs.writeFile('myFile2.txt', 'Hello again!', { encoding: 'ascii' }, (err) => {
  if (err) throw err;
  console.log('File written successfully with ASCII encoding.');
});

Details:

• encoding: Specifies the encoding of the data to be written to the file. Supported encodings include 'utf8', 'ascii', 'base64', etc.
• mode: Set the permission mode of the file. The value is an octal number that represents the file's owner, group, and world read, write, and execute permissions on the file.
• flag: Specify the flag when opening the file. Other supported flags include 'r' (read), 'a' (append), 'w' (read-write overwrite), etc.

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