Stram a file to front End fron a nodejs backend

[salinda Fernando]

I created a ppt and try to stream it to the front end but it didnt work for me..

this is the server.js code

app.post("/generateppt", function(req, res) {

   pptGeneratorO.generatePPT(req, res,function(data);

       res.end();

});

this is the pptgenerator code

generatePPT: function( req , res ,callback)

 {

var pptx = officegen(

  {

    type: 'pptx',

     title: 'title',

    

    }

     );

        // var pptName = 'out1.pptx';

    res.writeHead ( 200, {

    "Content-Type": "application/vnd.openxmlformats-officedocument.presentationml.presentation",

    'Content-disposition': 'attachment; filename=Summary.pptx'

  });

  

  //  pptx.on ( 'finalize', function ( written ) {

 

  //     console.log ( 'Finish to create a PowerPoint file.\nTotal bytes created: ' + written + '\n' );

      

  //   });

 

  //     pptx.on ( 'error', function ( err ) {

  //       console.log ( err );

  //         });

      // var pptName = fs.createWriteStream('output.pptx');

        var slide = pptx.makeNewSlide ();   

        slide.addText('hai');   

       

      

        console.log('ppt is geenreated');

 

      var out = fs.createWriteStream ( 'out.pptx' );

 

      pptx.generate ( out, {

          'finalize': function ( written ) {

              console.log ( 'Finish to create a PowerPoint file.\nTotal bytes created: ' + written + '\n' );

          },

          'error': function ( err ) {

              console.log ( err );

          }

      });

      

     callback(res);

    }

};

front end code

.post("/generateppt", {req: '', res: ''})

            .then(function(response) {

             console.log("saved successfully");

                 var pdfDoc = response.data;

                 var pdfBlob = new Blob([pdfDoc], { type: "application/vnd.openxmlformats-officedocument.presentationml.presentation" });

                 var pdfURL = window.URL.createObjectURL(pdfBlob);

                 var tempLink = document.createElement("a");

                 tempLink.href = pdfURL;

                 tempLink.setAttribute(

                     "download",

                     "Summary"

                 );

                 tempLink.setAttribute("target", "_blank");

                 document.body.appendChild(tempLink);

                 tempLink.click();

                 document.body.removeChild(tempLink);

              

            });