basic node express CRUD

basicCRUD.js

const express = require('express');
let app = express();

let example = require('../models/example');


// Create a new example
app.post('/example', (req, res) => {
    let body = req.body;
    let example = new example({
        name: body.name,
        description: req.description
    })
    example.save((err, exampleDB) => {
        if (err) {
            return res.status(500).json({
                ok: false,
                err
            });
        }
        if (!exampleDB) {
            return res.status(400).json({
                ok: false,
                err
            });
        }
        res.json({
            ok: true,
            example: exampleDB
        });
    });

});

// Get all examples (sorted by description)
app.get('/example', (req, res) => {
    example.find({})
        .sort('description')
        .exec((err, examples) => {
            if (err) {
                return res.status(500).json({
                    ok: false,
                    err
                });
            }
            res.json({
                ok: true,
                examples
            });
        });
});

// Get an example by id
app.get('/example/:id', (req, res) => {
    let id = req.params.id;
    example.findById(id, (err, exampleDB) => {
        if (err) {
            return res.status(500).json({
                ok: false,
                err
            });
        }
        if (!exampleDB) {
            return res.status(500).json({
                ok: false,
                err: {
                    message: 'The id is not valid'
                }
            });
        }

        res.json({
            ok: true,
            example: exampleDB
        });
    })
});



// Update an example
app.put('/example/:id', (req, res) => {
    let id = req.params.id;
    let body = req.body;

    let descexample = {
        description: body.description
    };
    example.findByIdAndUpdate(id, descexample, { new: true, runValidators: true, context: 'query' }, (err, exampleDB) => {
        if (err) {
            return res.status(400).json({
                ok: false,
                err
            });
        }
        if (!exampleDB) {
            return res.status(400).json({
                ok: false,
                err
            });
        }
        res.json({
            ok: true,
            example: exampleDB
        });
    });

});


// Delete an example
app.delete('/example/:id', (req, res) => {
    let id = req.params.id;


    example.findByIdAndRemove(id, (err, exampleDB) => {
        if (err) {
            return res.status(500).json({
                ok: false,
                err
            });
        }
        if (!exampleDB) {
            return res.status(400).json({
                ok: false,
                err: {
                    message: 'The id doesnt exists'
                }
            });
        }
        res.json({
            ok: true,
            message: 'example deleted'
        });
    });

});



module.exports = app;