Node.js fs module
What this article includes:
- What is node fs module?
- What are the asynchronous functions?
- What are the synchronous functions?
- References to learn more
What is node fs module?
<code>fs</code> stands for File System. File system module is used to write and read a file. <code>fs</code> is part of node core modules. <code>fs</code> module provides both synchronous and asynchronous functions for the behaviors like read file, write file, delete file.
What are the asynchronous functions?
Ususally fs asynchronous functions always requires a callback function and it does not block further execution.
<ol>- Unlink a file </ol> ```js const fs = require('fs'); const callbackFun = (err) => {}; fs.unlink('/tmp/me.text', callbackFun); ``` <ol>- Write a file </ol> ```js const fs = require('fs'); const data = new Uint8Array(Buffer.from('Onkar')); const callbackFun = (err) => {}; fs.writeFile('/tmp/me.text', data, callbackFun); ``` <ol>- Read a file </ol> ```js const fs = require('fs'); const callbackFun = (err, data) => {}; fs.readFile('/tmp/me.text', callbackFun); ```What are the synchronous functions?
Synchronous function will block further execution till the operation is completed and returns the output for the function.
<ol>- Unlink a file </ol> ```js const fs = require('fs'); fs.unlinkSync('/tmp/me.png'); ``` <ol>- Write a file </ol> ```js const fs = require('fs'); const data = new Uint8Array(Buffer.from('Onkar')); fs.writeFileSync('/tmp/me.text', data); ``` <ol>- Read a file </ol> ```js const fs = require('fs'); const data = fs.readFileSync('/tmp/me.text'); ```