How to convert file into a blob or javascript file in NodeJS?

Question

I have a function which receives a file in this format through multer package.. Now I want to upload this file to firebase storage, for that I need it in a Blob or in javascript file format.

My function is-

const getFileURL = file => {
    const storageRef = firebase.storage().ref();
    let url = "";
    let err = null;
    const metadata = {
        contentType: file.mimetype,
    };
    const uploadFile = storageRef.child(name).put(file);
    uploadFile.on(
        "state_changed",
        function (snapshot) {},
        function (error) {
            console.log("errrroror", error);
            return error;
        },
        function () {
            uploadFile.snapshot.ref
                .getDownloadURL()
                .then(function (downloadURL) {
                    url = downloadURL;
                    return url;
                });
        }
    );
};

File received in the above function:

{
  fieldname: 'file',
  originalname: 'file_name.jpg',
  encoding: '7bit',
  mimetype: 'image/jpeg',
  destination: './public/images',
  filename: '85d68e32b2b18adbfc7d0f72b5746e43',
  path: 'public/images/85d68e32b2b18adbfc7d0f72b5746e43',
  size: 96966
}

Caller Function:

uploadImage = async (req, res, next) => {
    try {
        const url = getFileURL(req.files[0]);
        return res.json({ location: url });
    } catch (e) {
        return res.json(e);
    }
}

I'm getting error as :Firebase Storage: Invalid argument in 'put' at index 0: Expected Blob or File.

Are you using mutler.single or mutler.array or mutler.fields ? — Shivam Singla
– Shivam Singla, Commented Oct 9, 2020 at 19:15
@ShivamSingla I'm using mutter.any(). getFileURL is receiving file properly, I don't think problem is in the calling function — thatman303
– thatman303, Commented Oct 9, 2020 at 19:17

Shivam Singla · Accepted Answer · 2020-10-09 19:25:14Z

-1

This should work

// ...snip
const blob = new Blob([file.buffer])
const uploadFile = storageRef.child(name).put(blob)
// ...snip

Reference or this answer

answered Oct 9, 2020 at 19:25

Shivam Singla

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5 Comments

thatman303 Over a year ago

Hi, actually 'Blob' function is not defined in Nodejs. So I'm getting error as ReferenceError: Blob is not defined

Shivam Singla Over a year ago

@YashBoura Try blob for client side or node-blob for server side

thatman303 Over a year ago

I want to handle in server side. No luck with node-blob too.

Shivam Singla Over a year ago

@YashBoura are the firebase storage API available for server-side too? As far as I know, we have to use google client libraries to upload to firebase storage. ref

thatman303 Over a year ago

Well you are right, I have to use google cloud for this. Thanks

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