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Async Copy in fs-extra - NodeJS
Introduction to Async copy
This method copies files or directories from one location to another location. The directory can have sub-directories and files.
Syntax
copy(src, dest[, options][, callback])
Parameters
src – This is a string paramter which will hold the source location of the file or directory that needs to be copies. If the location is a directory, it will copy everything inside of the directory instead of whole directory.
dest – This will hold the destination location where the files/directories will be copies. If src is a files, dest cannot be a directory.
options −
overwrite – If set to true, existing files or directories will be overwritten. Default value is set to true.
errorOnExist – It will throw an error if the destination file/folder exists only when overwrite is set to false.
preserveTimestamps – Latest modification and access time will be set to that of the original files if true, else it will be OS dependent.
filter – This option will filter copied files. Will include filtered files if set to true.
callback – This function will give a callback if any error occurs.
Example
Check that fs-extra is installed before proceeding, if not, install fs-exra.
You can use the following command to check whether fs-extra is installed or not.
npm ls fs-extra
Create a copyExample.js and copy-paste the following code snippet into that file.
Now, run the following command to run the code snippet.
node copyExample.js
Code Snippet
const fs = require('fs-extra')
// Copies file with a callback:
fs.copy('/tmp/myfile', '/tmp/mynewfile', err => {
if (err) return console.error(err)
console.log('success with callback!')
}) // Return a callback if any error occurs
// Copies directory from src to dest
fs.copy('/tmp/mydir', '/tmp/mynewdir', err => {
if (err) return console.error(err)
console.log('Directories copied successfully!')
})
// Copies file with Promises:
fs.copy('/tmp/myfile', '/tmp/mynewfile')
.then(() => {
console.log('success with promise!')
})
.catch(err => {
console.error(err)
})
// Copies file with async/await:
async function copyExample () {
try {
await fs.copy('/tmp/myfile', '/tmp/mynewfile')
console.log('success with await!')
} catch (err) {
console.error(err)
}
}
copyExample()Output
C:\Users\tutorialsPoint\> node copyExample.js success with callback! success with promise! success with await! Directories copied successfully!
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