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Node.js - File System 

Prashant Surya  |   Nov 19, 2019  |  Views: 9

Description:

File system in node.js a module 'fs' which provide the utility/API to interact with files and its manipulation async / sync way.

All utilities takes callback argument and have first output parameter as err, to handle error first.

If there is not any error, it will be null/undefined.

How to import in application;
const fs = require('fs');

File system (fs) have a big list of API which we use according to the requirements in async/sync way.


A file system needs a path of the file which can be a string/buffer/url.

Some of the mostly used API we are discussing below:


fs.open(path[, flags[, mode]], callback):
  • -It works asynchronously to open a file.
  • -To work in sync way we have to use fs.openSync() 
Example:
const fs = require('fs');
fs.open('/open/some/file.txt', 'r', (err, fd) => {
  if (err) throw err;
  fs.close(fd, (err) => {
    if (err) throw err;
  });
});
  • fs.close(fd,callback) / fs.closeSync(fd)  : To close the connection with file stream
  • fs.readFile(path[, options], callback) / fs.readFileSync(path[, options])  : To read the file asyns/sync manner
  • fs.mkdir(path[, options], callback) / fs.mkdirSync(path[, options]) : To new create directory at the specified path
  • fs.rmdir(path, callback) / fs.rmdirSync(path) : To remove the specified directory async/sync
  • fs.copyFile(src, dest[, flags], callback) / fs.copyFileSync(src, dest[, flags]) : To create copy of file from source to destination





Comments:
Content Contributor
Prashant Surya

Prashant Surya

Software developer at Uniserve Data Technologies Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a software developer, freelancer and trainer working on technologies likes. MEAN stack, MERN Stack, ASP.NET full stack, WebRTC, socket.io ,PWA, SQL, JavaScript, jQuery, HTML, CSS, SEO, responsive UI/UX designing... having 7 years of experience in development in multiple domains like, eCommerce, RTA, capital markets, education, real estate...


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