Write File with Sync and Async using Node.js

Writing the file using file system module. we have two options to process synchronous and asynchronous. Here we are testing on synchronous of the node.js. The sequence of code should wait until we write the sample txt file. For that waiting we are using writeFileSync class from File system module.

var file = require("fs");

console.log("Starting...");

var contents = file.writeFileSync("./write_file.txt", "Text to Write");

console.log(" done ...");

Here we are testing on asynchronous of the node.js. The sequence of code should not wait until we read the sample txt file. For that we are using callback function.

var file = require("fs");

console.log("Starting...");

var contents = file.writeFile("./write_file.txt", "Text to Write",

function(error){

console.log("written file");

}

);

console.log(" done ...");