Answers for "fs write js"

fs.writefile

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!');

javascript write to file

<script> 
// Requiring fs module in which 
// writeFile function is defined. 
const fs = require('fs') 
  
// Data which will write in a file. 
let data = "Learning how to write in a file."
  
// Write data in 'Output.txt' . 
fs.writeFile('Output.txt', data, (err) => { 
      
    // In case of a error throw err. 
    if (err) throw err; 
}) 
</script>

javascript fs read

fs.readFile('/etc/passwd', (err, data) => {
  if (err) throw err;
  console.log(data);
});