...

// Our prediction endpoint (Receives an image as req.file)
app.post('/predict', upload.single('img'), async function (req, res) {
    const { path } = req.file
    try {
        const prediction = await PythonConnector.invoke('predict_from_img', path);
        res.json(prediction);
    }
    catch (e) {
        console.log(`error in ${req.url}`, e);
        res.sendStatus(404);
    }

    // delete the uploaded file (regardless whether prediction successful or not)
    fs.unlink(path, (err) => {
        if (err) console.error(err)
        console.log('Cleaned up', path)
    })
})

...