Node.js is the most powerful and most popular javascript runtime platform, which allows to running of javascript code on the server side. In 2023, Node.js introduced many exciting features. In the recent release of Node.js 21, the API has been transformed to the stable version. It actually streamlines the javascript development that runs on both the front end and back end.

The new release of Node.js 21 has this modification. The fs.writeFile has the flush option. When a user completes the write transactions, then he can use the flush option, and the data will be compelled and flushed to the permanent storage. In the most recent version of Node.js 21, the parser HTTP now has all the abilities to activate the extra leniency flags. It makes llhttp able to communicate more easily with non-standard HTTP implementations. To enable the flags leniency, you can use: — insecure-HTTP-parser.