How to use find method to search for an object in a function

I am stuck to find the user by id using the find function. My this getUsers() function returns an array of objects.

function getUsers(filter, limit, offset) {
  let userList = [];
  for (let i = 0; i < 100; i++) {
    let user = {};
    user.id = i;
    user.firstname = 'firstname_' + i;
    user.lastname = 'lastname' + i;
    user.email = user.userId + "@hotmail.com";
    userList.push(user);
  }
  return JSON.stringify(userList);
}

and I want to find a user by its id here but it shows Data not found:

app.get('/shops/:shopid/users/:userId', (req, res) => {
   let users = getUsers(undefined, undefined, undefined);
   const result = users.find(u => u.id === parseInt(req.params.userId));  
   if(!result) res.status(404).send('Data not found');
   res.send(result);
});

>Solution :

Because getUsers returns a JSON string instead of an array. The find method only works on arrays. So you have a few options.

Option 1: Simply return the array in getUSers function

function getUsers(filter, limit, offset) {
  let userList = [];
  for (let i = 0; i < 100; i++) {
    let user = {};
    user.id = i;
    user.firstname = 'firstname_' + i;
    user.lastname = 'lastname' + i;
    user.email = user.userId + "@hotmail.com";
    userList.push(user);
  }
  return userList;
}

Option 2: Use JSON.parse when calling getUsers

app.get('/shops/:shopid/users/:userId', (req, res) => {
   let users = JSON.parse(getUsers(undefined, undefined, undefined));
   const result = users.find(u => u.id === parseInt(req.params.userId));  
   if(!result) res.status(404).send('Data not found');
   res.send(result);
});