Reading a file with Node.js

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 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.

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);
  });

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

today is monday

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