Changed Get, Post and Delete to have return

src/routers/user.js

 router.get('/users', (req, res) => {
     try {
         if (Object.entries(req.params).length === 0) {
-            res.status(200).send('getting all users')
+            return res.status(200).send('getting all users')
         }
         else {
-            res.status(400).send('unable to get all users, request was bad')
+            return res.status(400).send('unable to get all users, request was bad')
         }
     } catch (e) {
-        res.status(500).send(e)
+        return res.status(500).send(e)
     }
 })
 
     try {
         if (req.params.id) {
             //get by Id
-            res.status(200).send('sending user with id of ' + req.params.id)
+            return res.status(200).send('sending user with id of ' + req.params.id)
         }
         else {
-            res.status(400).send('Bad request')
+            return res.status(400).send('Bad request')
         }
     } catch (e) {
-        res.status(500).send(e)
+        return res.status(500).send(e)
     }
 })
 
     try {
         if (Object.entries(req.body).length !== 0) {
             //create user
-            res.status(201).send('creating user').send(req.body)
+            return res.status(201).json(req.body)
         }
         else {
-            res.status(400).send('bad request')
+            return res.status(400).send('bad request')
         }
     } catch (e) {
-        res.status(500).send(e)
+        return res.status(500).send(e)
     }
 })
 
     try {
         if (req.params.id) {
             //get by Id
-            res.status(204).send('deleting user with id of ' + req.params.id)
+            return res.status(204).send('deleting user with id of ' + req.params.id)
         }
         else {
-            res.status(400).send('Bad request')
+            return res.status(400).send('Bad request')
         }
     } catch (e) {
-        res.status(500).send(e)
+        return res.status(500).send(e)
     }
 })