how to do crud operation in node js

1npm install --save express body-parser mongoose

1// Update a note identified by the noteId in the request
2exports.update = (req, res) => {
3    // Validate Request
4    if(!req.body.content) {
5        return res.status(400).send({
6            message: "Note content can not be empty"
7        });
8    }
9
10    // Find note and update it with the request body
11    Note.findByIdAndUpdate(req.params.noteId, {
12        title: req.body.title || "Untitled Note",
13        content: req.body.content
14    }, {new: true})
15    .then(note => {
16        if(!note) {
17            return res.status(404).send({
18                message: "Note not found with id " + req.params.noteId
19            });
20        }
21        res.send(note);
22    }).catch(err => {
23        if(err.kind === 'ObjectId') {
24            return res.status(404).send({
25                message: "Note not found with id " + req.params.noteId
26            });                
27        }
28        return res.status(500).send({
29            message: "Error updating note with id " + req.params.noteId
30        });
31    });
32};
33