Base64 to Pdf in Reactjs Using Api Call

i am struggling to display the PDF in the browser, although i am getting Base64 code and using onlinetool() i can see the code convert into the correct PDF file that is stored in the backed. After that i convert to blob Object and then it doesnt seems to open in the adobe reader when i click on the button.

// when the button is pressed, it will call the API to get the PDF document 

 const headers = new Headers();
        headers.append("content-type", "application/json");
        headers.append("responseType", "arraybuffer");

        const options = {
          method: "POST",
          headers,
          credentials: "include",
          body: JSON.stringify(invoice_Object),
          // body: "My HTML String",
        };

        const newRequest = new Request("", options);

        (async () => {
          const invoice_Call = await fetch(newRequest)
            .then((res) => {
              return text1 = res.text();
            })
            .then((data) => {
             generateFile(data, invoice_Name);// here data is the actual item that i am looking to display as PDF document
            });
        })();
      };

• Then it will open the PDF document in adobe reader, here the console content shows the correct Base64 code i think as seen when i use the code on online tool to convert to PDF document. So i am not sure if i am doing something wrong here generating the blob object and display as pdf.

   let generateFile = (content, fileName) => {
       console.log("content", content); // here at console if i copy the code and use online tool() it shows the correct pdf
       const blob = new Blob([content], { type: "application/pdf" });
       console.log(blob);
       const link = document.createElement("a");
       link.href = window.URL.createObjectURL(blob);
       link.download = fileName;
       link.click();
       };

• Backend code

     fs.readFile(`${__dirname}\\` + `${Invoice_No_Actual}` + `.pdf`, (err, data) => {
          if (err) res.status(500).send(err);
          else {
                   res.contentType("application/pdf");
                 res.send(`data:application/pdf;base64,${new Buffer.from(data).toString("base64")}`);
          }
        });
      }

• BI have also uploaded the base64 code that i am getting when console logging at pastebin,
• Error when opening the PDF document after i click the button