node.js remove file

You can call fs.unlink(path, callback) for Asynchronous unlink(2) or fs.unlinkSync(path) for Synchronous unlink(2).
Where path is file-path which you want to remove.

For example we want to remove discovery.docx file from c:/book directory. So my file-path is c:/book/discovery.docx. So code for removing that file will be,

var fs = require('fs');
var filePath = 'c:/book/discovery.docx'; 
fs.unlinkSync(filePath);

If you want to check file before delete whether it exist or not. So, use fs.stat or fs.statSync (Synchronous) instead of fs.exists. Because according to the latest node.js documentation, fs.exists now deprecated.

For example:-

 fs.stat('./server/upload/my.csv', function (err, stats) {
   console.log(stats);//here we got all information of file in stats variable

   if (err) {
       return console.error(err);
   }

   fs.unlink('./server/upload/my.csv',function(err){
        if(err) return console.log(err);
        console.log('file deleted successfully');
   });  
});

I think you want to use fs.unlink.

More info on fs can be found here.

I don't think you have to check if file exists or not, fs.unlink will check it for you.

fs.unlink('fileToBeRemoved', function(err) {
    if(err && err.code == 'ENOENT') {
        // file doens't exist
        console.info("File doesn't exist, won't remove it.");
    } else if (err) {
        // other errors, e.g. maybe we don't have enough permission
        console.error("Error occurred while trying to remove file");
    } else {
        console.info(`removed`);
    }
});