如何保存来自 multer memory 磁盘的图像？

Question

I use multer in nodejs to handle multipart/formdata request and get the image file on the request like this:

import multer from "multer";

const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 1000000000, files: 2 },
});



app.post("/", upload.single("image"), (req, res , next) => {
      const imageFile = req.file

      dbx
        .filesUpload({ path: "/image.png", contents: imageFile })
        .then((response: any) => {
         
        })
        .catch((uploadErr) => {
         
        });
    }
  )

The problem is I can't upload the image and it gives me error that it's a Buffer not an actual image. How can I generate the image from req.file then upload it without saving it on the disk?

Answer 1

You can decode your data or change it's encoding but to convert it to an image doesn't make any sense.

The example code provided by dropbox here , reads a file in utf-8 and uploads it.

You can also do that same by taking the buffer in the post data encoding it as utf-8 then uploading that while keeping it in memory and never have to touch disk.

  const imageFile = req.file.buffer.toString('utf-8');

Answer 2

I solved the issue by sending the buffer image itself to dropbox like this:

app.post(
  "/",
  upload.single("image"), // or upload single for one file only
  (req, res) => {
    const imageFile = req.file && req.file.buffer;
    // console.log(imageFile);

    dbx
      .filesUpload({ path: "/life.png", contents: imageFile })
      .then((response: any) => {
        console.log("SUccess");
      })
      .catch((uploadErr) => {
        console.log("ERRRR");
        console.log(uploadErr);
      });

    res.json({ message: "hello" });
  }
);