"File is not defined" error in javascript while executing from node.js command prompt

Question

I have a javascript in which I try to read a file and just print it on the console , however it gives "File is not defined" error inspite of the file test.txt being in the same path Following is the code snippet.

var txtFile = "test.txt";
var file = new File(txtFile);
file.open("r");
var str = "";
while (!file.eof) {
    str += file.readln() + "\n";
}
console.log(str);
file.close();    

Answer 1

In node.js you don't have File, but you can use the built in file-system if you require it. You can also read all the file at once with readFileSync (faster than reading it row by row).

const fs = require('fs');

let txtFile = "test.txt";
let str = fs.readFileSync(txtFile,'utf8');

console.log(str);