unable to verify zip response from get

[aptiway-dev-app]

We have written NodeJS based express application. REST API is defined as following:

router.get('/module/:id/', async (req, res ) => {
    try {
       
        var moduleid = req.params.id
   
        const module =  await ModuleMaster.findById(moduleid)
        
        if(!module || !module.modulefile){
            throw new Error('Module does not exist')
        }
         res.set('Content-Type','application/zip')
        res.send(module.modulefile)
    } catch (error) {
        res.status(404).send(error.Message)
    }
})

Above function is successfully returning file is being tested in browser and postman.

As part of automation, we have written following Jest script to test the functionality of receiving file.

const request = require('supertest')
responseFromFileFAPI = await request(app).get('/module/1')
            .expect(200)
            expect(responseFromFileFAPI.body).not.toBeNull()
            expect(responseFromFileFAPI.body.Buffer)   

All above expect are passing however I am not sure how can I convert the response to zip format so that I can use it to compare with original file?