how to store image from buffer to file system in node.js using sharp.js

Question

i am using sharp.js for image manipulation in node.js

my code

sharp(path)
        .toFormat('jpeg')
        .toBuffer((err, data, info) => {
            fs.writeFile(temp, buffer, { flag: 'w' }, function() {
                response.sendFile(temp);
            });
        });

here temp in fs means "the path" var temp= imageDir + request.params.id; ( http://localhost:2000/images/we.png )

upload image as png format or any other format
convert that image to JPEG using .toFormat('jpeg') and send to buffer
want to save that image from buffer to

https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback — Geuis, Jun 20 '18 at 20:59
Is this question complete? It looks like it's missing some things — Robert Mennell, Jun 20 '18 at 21:00
You're going to need to provide sample code that demonstrates your problem. — Geuis, Jun 20 '18 at 21:01
@RobertMennell yes robert the question was complete one ., i converted the file but can't able to save them can you suggest a way to do so ? — User_3535, Jun 20 '18 at 21:01

bknights · Answer 1 · 2018-06-20T21:20:29.800

3

Your code doesn't have 'buffer'. You should be writing data.

.toBuffer((err, data, info) => {
        fs.writeFile(temp, data, { flag: 'w' }, function() {
            response.sendFile(temp);
        });
    });

but you'd be better off using toFile instead of toBuffer:

sharp('originalFile.jpg').
        resize(330,null).
        flatten().
        toFile('newFile.jpg', function(err){
            if(err){
                response.sendStatus(500);
                return;
            }
            response.sendFile('newFile.jpg');
        });

edited Jun 20 '18 at 21:20

answered Jun 20 '18 at 21:17

bknights

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thank you but ., what if i upload a jpg and convert to png ? .. file format was what ever we want ., – User_3535 Jun 20 '18 at 21:20
Then manipulate newFile.jpg to have the correct extension. If your variable `temp` already reflects the desired file type in its extension then just use that. Otherwise fix it. – bknights Jun 20 '18 at 21:21
okay so if i want to process a image with extension .webp to tiff ., okay the file name should not change the as of original name ., what if i can do ? – User_3535 Jun 20 '18 at 21:25
file name are of dynamic one ., then toFile are of too dynamic based on query parameter – User_3535 Jun 20 '18 at 21:26

score 1 · Answer 2 · answered Mar 20 '20 at 10:41

You can do this

sharp(req.files[0].path).resize(400, 200).toFile('uploads/' + 'thumbnail-' + req.files[0].originalname, (err, sharp) => {
            if (err) {
                console.error(err);
            }
            else {
                console.log(sharp);
            }
        });

how to store image from buffer to file system in node.js using sharp.js

2 Answers2