Now let’s check the text folder is there any changes that happened or not. In our console, we can see that the message has been showing successfully.
The fs.writeFileSync() function does not return anything and that’s why we didn’t use any variable and finally, we put a console log with a message that the file has been written. Here, we take a variable and write some text and then save this file. Let’s write a file with the help of NodeJS and see if there any changes occurred or not in the below: const fs = require('fs')Ĭonst txtWrite = `This is a write file and it will save this text into text folderįs.writeFileSync('./text/writefile.txt', txtWrite) Here, you can see that in our text folder we have only one file named readfile. It will follow the same process that we have followed in the reading file section except to write a file we will use fs.writeFileSync() function and in this function, we will define a particular path where the file will be saved and for our easiness, we will define a variable where we will write some text. We will write a file externally and save it in our directory. In your case, all you need to do is to type node, and then your file name in the console. You can see that our file has been read successfully in the console and to see the output we give the command in our console which is node app.js. If everything is fine then we will be able to see the output with some text that we have written in the file. So we save the return file into textRead variable and finally print it to the console. This readFilySync()` function will return the file that we have mentioned. Here, we import the fs module from NodeJS built-in module and then read a file that is located in the same directory in the text folder with the name of readfile.txt.
#Nodejs read file code#
Let’s see the below code example: const fs = require('fs')Ĭonst textRead = fs.readFileSync('./text/readfile.txt','utf-8') If you don’t use the character encoding then the output will be shown as a buffer. It takes two arguments, the first one is the path of the particular file that will be read and the next one is the character encoding. We already know about the fs module and this module helps us to read a file synchronously. In this section, we will read a file synchronously, and to do so we will use fs.readFileSync() function. We will import this module to work with the file system and read and write our file. It will require the module from NodeJS built-in module and is available for you to use it. Here, we have used const instead of using var and it is an ES6 feature. Let’s see the below code example of how you can import the fs module in your project. It will work both in a synchronous and asynchronous way. such as read file, write file, append file, and so on. The meaning of fs is a file system that helps you to work with files. NodeJS lets you perform different useful actions with its built-in modules.
In this tutorial, we will use visual studio code. A text editor – You can choose any text editor on which you may write JavaScript code such as sublime text, nodepad++, etc.Basic knowledge of JavaScript, Node modules, etc.A configured computer with an internet connection.To complete this tutorial in the most effective way you need to keep some things in your mind. Before starting this tutorial, let’s see the prerequisite that will help you to get the best outcome. We will cover both of these in this tutorial and after completing this tutorial you will be able to read and write your own file from the computer both in a synchronous and an asynchronous way. You can read or write a file from your computer both synchronously or asynchronously. It is a very essential functionality that is provided by NodeJS and the implementation of these things is very easy. Reading and writing files is one of them. NodeJS is very fast and highly scalable because of its event-driven, single-threaded and, non-blocking I/O model and you can do many interesting things by using it.
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