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routes/user.js

+const router = require('express').Router();
+let User = require('../model/user.model');
+
+router.route('/').get((req, res) => {
+  User.find()
+    .then(users => res.json(users))
+    .catch(err => res.status(400).json('Error: ' + err));
+});
+
+router.route('/add').post((req, res) => {
+  const user_id = req.body.user_id;
+  const name = req.body.name;
+  const email = req.body.email;
+  const password = req.body.password;
+
+  const newUser = new User({_id: user_id,name,email,password});
+
+  newUser.save()
+    .then(() => res.json('User added!'))
+    .catch(err => res.status(400).json('Error: ' + err));
+});
+
+router.route('/:id').get((req, res) => {
+  User.findById(req.params.id)
+    .then(users => res.json(users))
+    .catch(err => res.status(400).json('Error: ' + err));
+});
+router.route('/:id').delete((req, res) => {
+  User.findByIdAndDelete(req.params.id)
+    .then(() => res.json('User deleted'))
+    .catch(err => res.status(400).json('Error: ' + err));
+});
+
+router.route('/update/:id').post((req, res) => {
+  User.findById(req.params.id)
+    .then(user => {
+      user.user_id = req.body.user_id;
+      user.name = req.body.name;
+      user.email = req.body.email;
+      user.password = req.body.password;
+
+      user.save()
+        .then(() => res.json('User updated!'))
+        .catch(err => res.status(400).json('Error: ' + err));
+    })
+    .catch(err => res.status(400).json('Error: ' + err));
+});
+module.exports = router;
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