servrer.js

//login query example
app.post("/verify", (request, response) => {
const req=request.body
var output={}
try
{
var info = jwt.verify(req.token, privateKey, { algorithm: 'HS512' });
 output["verified"]=1;
}catch(err)
{
 output["verified"]=0;
}
  response.json(output)
})