node.js: fs.createWriteStream(path[, options]): Working with Writeable stream

fs.createWriteStream(path[, options])

This method creates a writeable stream, used to write data to a file.

Below table summarizes the arguments of createWriteStream method.

Argument	Type	Description
path	string or Buffer or URL	File path to write data.
options	string or Object	Below table summarizes the options supported by createWriteStream method. Option Type Description flags string Default value is ‘r’ encoding string Default value is null. fd integer Default value is null. if fd is specified, WriteStream will ignore the path argument and will use the specified file descriptor. mode integer Default value is 0o666. autoclose boolean Default value is true. If autoClose is set to true (default behavior) on 'error' or 'finish' the file descriptor will be closed automatically. If autoClose is false, then the file descriptor won't be closed, even if there's an error. start integer It is used to write data from specific position.

Find he below working application.

HelloWorld.js

var fs = require('fs');

var writeStream = fs.createWriteStream('data.txt');

writeStream.on('finish', () => {
    console.log('*********************');
    console.log('All writes are now complete.');
    console.log('*********************\n');
});

writeStream.on('close', () => {
    console.log('*********************');
    console.log('Closing the stream');
    console.log('*********************');
});

writeStream.write('Hello, How are you\n');
writeStream.write('I am fine, thank you....\n');
writeStream.end('This is the end of the file');

writeStream.close();

Output

*********************

All writes are now complete.

*********************

*********************

Closing the stream

*********************

Open ‘data.txt’, you can see below messages in the console.

Hello, How are you

I am fine, thank you....

This is the end of the file

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