Node.js filehandle.writeFile() Method from class: FileHandle Last Updated : 06 Apr, 2023 Comments Improve Suggest changes Like Article Like Report The filehandle.writeFile() method is used to define in the File System module of Node.js. The File System module basically interacts with the hard disk of the user’s computer. The fs.writeFile() method asynchronously writes data to a file, replacing the file if it already exists. Syntax: filehandle.writeFile(data, options) Parameter: This method accepts two parameters as mentioned above and described below: data: It is a String, Buffer, or Uint8Array instance. It is the data that will write to the file.options: It is an optional parameter that affects the output in some way accordingly we provide it to the function call or not.encoding: It is a string that specifies the encoding technique, the default value is ‘utf8’. Example 1: This example explains how to write operations done to the file that already exists. javascript // Node.js program to demonstrate the // filehandle.writeFile() Method // Importing File System and Utilities module const fs = require('fs') // The readFileSync() method reads the // contents of the file and returns the // buffer form of the data const oldBuff = fs.readFileSync('./tesTfile.txt') const oldContent = oldBuff.toString() console.log(`\nOld content of the file :\n${oldContent}`) const writeToFile = async (path, data) => { let filehandle = null try { filehandle = await fs.promises.open(path, mode = 'w') // Write to file await filehandle.writeFile(data) } finally { if (filehandle) { // Close the file if it is opened. await filehandle.close(); } } // New content after write operation const newBuff = fs.readFileSync('./tesTfile.txt') const newContent = newBuff.toString() console.log(`\nNew content of the file :\n${newContent}`) } writeToFile('./testFile.txt', "Hey, I am newly added!") .catch(err => { console.log(`Error Occurs, Error code -> ${err.code}, Error NO -> ${err.errno}`) }) Output: Example 2: This example explains how to write operations done to the file that did not exist earlier but was created at run time. javascript // Node.js program to demonstrate the // filehandle.writeFile() Method // Importing File System and Utilities module const fs = require('fs') const writeToFile = async (path, data) => { let filehandle = null try { filehandle = await fs .promises.open(path, mode = 'w') // Write to file await filehandle.writeFile(data) } finally { if (filehandle) { // Close the file if it is opened. await filehandle.close(); } } // The readFileSync() method reads // the contents of the file and // returns the buffer form of the data const buff = fs.readFileSync(path) const content = buff.toString() console.log(`\nContents of the file :\n${content}`) } let query = "Hey there, I am newly added " + "content of newly added file!"; writeToFile('./testFile.txt', query) .catch(err => { console.log(`Error Occurs, Error code -> ${err.code}, Error NO -> ${err.errno}`) }) Directory structure before running the program: Directory structure after running the program: Output: Comment More infoAdvertise with us Next Article Node.js filehandle.writeFile() Method from class: FileHandle hunter__js Follow Improve Article Tags : Web Technologies Node.js Node.js-fs-module Similar Reads Node JS fs.readFile() Method âIn Node.js, the fs.readFile() method is a fundamental tool for reading files asynchronously, allowing your application to remain responsive while accessing file data. 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