app.js

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
const Recipe = require('./models/recipe');

mongoose.connect('mongodb+srv://maxime:1234567890@op-nodejs-rmkpy.mongodb.net/test?retryWrites=true')
  .then(() => {
        console.log('Successfully connected to MongoDB Atlas!');
})
  .catch((error) => {
        console.log('Unable to connect to MongoDB Atlas!');
        console.error(error);
});

app.use((req, res, next) => {
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content, Accept, Content-Type, Authorization');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS');
    next();
});

app.use(bodyParser.json());

app.post('/api/recipes', (req, res, next) => {
    const recipe = new Recipe({
        title:          req.body.title,
        ingredients:    req.body.ingredients,
        instructions:   req.body.instructions,
        time:           req.body.time,
        difficulty:     req.body.difficulty,
    });
    recipe.save().then(
        () => {
            res.status(201).json({
                message: 'Recipe saved successfully'
            });
        }
    ).catch(
        (error) => {
            res.status(404).json({
                error: error
            });
        }
    );
});

app.get('/api/recipes/:id', (req, res, next) => {
    Recipe.findOne({
        _id:    req.params.id
    }).then(
        (recipe) => {
            res.status(200).json(recipe);
        }
    ).catch(
        (error) => {
            res.status(404).json({
                error: error
            });
        }
    );
});

app.put('/api/recipes/:id', (req, res, next) => {
    const recipe = new Recipe({
        _id:    req.params.id,
        title:          req.body.title,
        ingredients:    req.body.ingredients,
        instructions:   req.body.instructions,
        time:           req.body.time,
        difficulty:     req.body.difficulty,
    });
    Recipe.updateOne(
        {
            _id: req.params.id
        }, 
        recipe
    ).then(
        () => {
            res.status(201).json({
                message: 'Recipe upgraded successfully'
            });
        }
    ).catch(
        (error) => {
            res.status(404).json({
                error: error
            });
        }
    );
});

app.delete('/api/recipes/:id', (req, res, next) => {
    Recipe.deleteOne({
        _id: req.params.id
    }).then(
        () => {
            res.status(200).json({
                message: 'Recipe deleted successfully'
            });
        }
    ).catch(
        (error) => {
            res.status(400).json({
                error: error
            });
        }
    );
});

app.use('/api/recipes', (req, res, next) => {
    Recipe.find().then(
        (recipes) => {
            res.status(200).json(recipes);
        }
    ).catch(
        (error) => {
            res.status(400).json({
                error: error
            });
        }
    );
});

module.exports = app;