nodejs_image_upload.js

router.post('/', upload.single('imgfile'), function (req, res) {
        var fextention = path.extname(req.file.originalname).toLowerCase();
        var targetPath = uuid.v4() + fextention;
        var tempPath = req.file.path,
            targetResolvedPath = path.resolve('./uploads/'+targetPath);
        //tempPathに置かれている画像ファイルをeasyimgのrescropでwidthを1000にする.
        if ( fextention === '.png' || fextention === '.jpg' || fextention === '.bmp') {
            easyimg.rescrop({
                    src:tempPath, dst:targetResolvedPath, width:1000
                        }).then(function(image){
                                res.json({image_url:targetPath});
                            });
        } else {
          //png jpg bmpじゃなかったらファイル削除
            fs.unlink(tempPath, function () {
                    if (err) throw err;
                    res.json({message:"Only png bmp jpg files are allowed"});
                });
        }

    });