For occasional appends, you can use appendFile, which creates a new file handle each time it’s called: Asynchronously: const fs = require(‘fs’); fs.appendFile(‘message.txt’, ‘data to append’, function (err) { if (err) throw err; console.log(‘Saved!’); }); Synchronously: const fs = require(‘fs’); fs.appendFileSync(‘message.txt’, ‘data to append’); But if you append repeatedly to the same file, it’s much … Read more
The answer to this question has changed over the years. The current answer is here at the top, followed by the various answers over the years in chronological order: Current Answer You can use fs.existsSync(): const fs = require(“fs”); // Or `import fs from “fs”;` with ESM if (fs.existsSync(path)) { // Do something } It … Read more
There are a lot of details in the File System API. The most common way is: const fs = require(‘fs’); fs.writeFile(“/tmp/test”, “Hey there!”, function(err) { if(err) { return console.log(err); } console.log(“The file was saved!”); }); // Or fs.writeFileSync(‘/tmp/test-sync’, ‘Hey there!’);