index.js

const app = express();
app.use(bodyParser.json());

app.post('/mutate', (req, res) => {
	console.log(req.body)
	console.log(req.body.request.object)
	let adminResp = {response:{
          allowed: true,
          patch: Buffer.from("[{ \"op\": \"add\", \"path\": \"/metadata/labels/foo\", \"value\": \"bar\" }]").toString('base64'),
          patchType: "JSONPatch",
        }}
        console.log(adminResp)
	res.send(adminResp)
})

const server = https.createServer(options, app);