Reading a file with Node.js



Read file in asynchronously


Read content of a file in a non-blocking is called asynchronous way. That is, to tell Node to read in the file, and then to get a callback when the file-reading has been finished.


Callbacks


Callbacks are a basic idiom in Node.js for asynchronous operations. When most people talk about callbacks, they mean the function that is passed as the last parameter to an asynchronous function. The callback is then later called with any return value or error message that the function produced.


Code for write and read file

const fs = require("fs");

// this is for write file

 fs.writeFile("read.txt","today is  monday", (err) => {
     console.log(" file is created")
  });

// Read file asynchronously

    const fs = require("fs");
    fs.readFile("read.txt","UTF-8",(err, data) =>{

 console.log(data);
    });

Tree structure of files






Run code

PS C:\node js> cd .\fsAsync\
PS C:\node js\fsAsync> node index.js

Output

today is monday

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