fs Module.pptx
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The document details the Node.js fs module, which enables file system operations such as creating, updating, deleting, and renaming files through methods like fs.appendFile(), fs.open(), fs.writeFile(), fs.unlink(), and fs.rename(). Each method is outlined with examples demonstrating how to append content, open files for writing, replace file content, delete files, and rename files. This provides a comprehensive overview for manipulating files in a Node.js environment.
fs Module.pptx
- 1. fs Module
- 2. Create Files The File System module has methods for creating new files: ⢠fs.appendFile() ⢠fs.open() ⢠fs.writeFile()
- 3. fs.appendFile() method The fs.appendFile() method appends specified content to a file. If the file does not exist, the file will be created: var fs = require('fs'); fs.appendFile(âNodeJS.txtâ, âWelcome to NodeJS Tutorialâ, function (err) { if (err) throw err; console.log('Saved'); });
- 4. fs.open() method The fs.open() method takes a "flag" as the second argument, if the flag is "w" for "writing", the specified file is opened for writing. If the file does not exist, an empty file is created. var fs = require('fs'); fs.open(' NodeJS.txt', 'w', function (err, file) { if (err) throw err; console.log('Saved!'); });
- 5. fs.writeFile() method 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. var fs = require('fs'); fs.writeFile(âNodeJS.txt', ' Welcome to NodeJS Tutorial ', function (err) { if (err) throw err; console.log('Saved!'); });
- 6. Update Files The File System module has methods for updating files: ⢠fs.appendFile() ⢠fs.writeFile()
- 7. fs.appendFile() method The fs.appendFile() method appends the specified content at the end of the specified file. var fs = require(âfsâ); fs.appendFile(âNodeJS.txtâ, âMukesh Kumarâ, function (err) { if (err) throw err; console.log(âUpdatedâ); });
- 8. fs.writeFile() method The fs.writeFile() method replaces the specified file and content. var fs = require(âfsâ); fs.writeFile(âNodeJS.txtâ, âThis is my textâ, function (err) { if (err) throw err; console.log(âReplacedâ); });
- 9. Delete Files To delete a file with the File System module, use the fs.unlink() method.
- 10. fs.unlink() method The fs.unlink() method deletes the specified file. var fs = require(âfsâ); fs.unlink(âNodeJS.txtâ, function (err) { if (err) throw err; console.log(âFile deletedâ); });
- 11. Rename Files To rename a file with the File System module, use the fs.rename() method.
- 12. fs.rename() method The fs.rename() method renames the specified file. var fs = require(âfsâ); fs.rename(âNodeJS.txtâ, âMukesh.txtâ, function (err) { if (err) throw err; console.log(âFile Renamedâ); });