Node.js File System Module
Example
Open a file, and output the content:
var fs = require('fs');
fs.readFile('demofile.txt', 'utf8', function(err, data) {
if (err) throw err;
console.log(data);
});
Run example »
Definition and Usage
The File System module provides a way of working with the computer's file system.
Syntax
The syntax for including the File System module in your application:
var fs = require('fs');
File System Methods
| Method | Description |
|---|---|
| access() | Checks if a user has access to this file or directory |
| accessSync() | Same as access(), but synchronous instead of asynchronous |
| appendFile() | Appends data to a file |
| appendFileSync() | Same as appendFile(), but synchronous instead of asynchronous |
| chmod() | Changes the mode of a file |
| chmodSync() | Same as chmod(), but synchronous instead of asynchronous |
| chown() | Changes the owner of a file |
| chownSync() | Same as chown(), but synchronous instead of asynchronous |
| close() | Closes a file |
| closeSync() | Same as close(), but synchronous instead of asynchronous |
| constants | Returns an object containing constant values for the file system |
| createReadStream() | Returns a new stream object |
| createWriteStream() | Returns a new writeable stream object |
| exists() | Deprecated. Checks if a file or folder exists |
| existsSync() | Same as exists(), but synchronous instead of asynchronous. This method is NOT deprecated |
| fchmod() | Changes the mode of a file |
| fchmodSync() | Same as fchmod(), but synchronous instead of asynchronous |
| fchown() | Changes the owner of a file |
| fchownSync() | Same as fchown(), but synchronous instead of asynchronous |
| fdatasync() | Syncronizes a file with the one stored on the computer |
| fdatasyncSync() | Same as fdatasync(), but synchronous instead of asynchronous |
| fstat() | Returns the status of a file |
| fstatSync() | Same as fstat(), but synchronous instead of asynchronous |
| fsync() | Syncronizes a file with the one stored on the computer |
| fsyncSync() | Same as fsync(), but synchronous instead of asynchronous |
| ftruncated() | Truncates a file |
| ftruncatedSync() | Same as ftruncated(), but synchronous instead of asynchronous |
| futimes() | Change the timestamp of a file |
| futimesSync() | Same as futimes(), but synchronous instead of asynchronous |
| lchmod() | Changes the mode of a file, for Mac OS X |
| lchmodSync() | Same as lchmod(), but synchronous instead of asynchronous |
| lchown() | Changes the owner of a file, for Mac OS X |
| lchownSync() | Same as lchown(), but synchronous instead of asynchronous |
| link() | Makes an addition name for a file. Both the old and the new name may be used |
| linksync() | Same as link(), but synchronous instead of asynchronous |
| lstat() | Returns the status of a file |
| lstatSync() | Same as lstat(), but synchronous instead of asynchronous |
| mkdir() | Makes a new directory |
| mkdirSync() | Same as mkdir(), but synchronous instead of asynchronous |
| mkdtemp() | Makes a new temporary directory |
| mkdtempSync() | Same as mktemp(), but synchronous instead of asynchronous |
| open() | Opens a file |
| openSync() | Same as open(), but synchronous instead of asynchronous |
| read() | Reads the content of a file |
| readdir() | Reads the content of a directory |
| readdirSync() | Same as readdir(), but synchronous instead of asynchronous |
| readFile() | Reads the content of a file |
| readFileSync() | Same as readFile(), but synchronous instead of asynchronous |
| readlink() | Reads the value of a link |
| readlinkSync() | Same as readlink(), but synchronous instead of asynchronous |
| realpath() | Returns the absolute pathname |
| realpathSync() | Same as realpath(), but synchronous instead of asynchronous |
| rename() | Renames a file |
| renameSync() | Same as rename(), but synchronous instead of asynchronous |
| rmdir() | Removes a directory |
| rmdirSync() | Same as rmdir(), but synchronous instead of asynchronous |
| stat() | Returns the status of a file |
| statSync() | Same as stat(), but synchronous instead of asynchronous |
| symlink() | Makes a symbolic name for a file |
| symlinkSync() | Same as symlink(), but synchronous instead of asynchronous |
| truncate() | Truncates a file |
| truncateSync() | Same as truncate(), but synchronous instead of asynchronous |
| unlink() | Removes a link |
| unlinkSync() | Same as unlink(), but synchronous instead of asynchronous |
| unwatchFile() | Stops watching for changes on a filename |
| utimes() | Change the timestamp of a file |
| utimesSync() | Same as utimes(), but synchronous instead of asynchronous |
| watch() | Watch for changes of a filename or directoryname |
| watchFile() | Watch for changes of a filename |
| write() | Writes buffer to a file |
| write() | Writes data to a file |
| writeFile() | Writes data to a file |
| writeFileSync() | Same as writeFile(), but synchronous instead of asynchronous |
| writeSync() | Same as write(); writes buffer to a file synchronous instead of asynchronous |
| writeSync() | Same as write(); writes data to a file synchronous instead of asynchronous |
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