Faire un API en NodeJS

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Exemple d'un API simple

// grab the packages that we need for the user model
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var bcrypt = require('bcrypt-nodejs');
 
// user schema
var UserSchema = new Schema({
    name: String,
    username: { type: String, required: true, index: { unique: true }},
    password: { type: String, required: true, select: false }
});
 
// hash the password before the user is saved
UserSchema.pre('save', function(next) {
    var user = this;
 
    // hash the password only if the password has been changed or user is new
    if (!user.isModified('password')) return next();
 
    // generate the hash
    bcrypt.hash(user.password, null, null, function(err, hash) {
        if (err) return next(err);
 
        // change the password to the hashed version
        user.password = hash;
        next();
    });
});
 
// method to compare a given password with the database hash
UserSchema.methods.comparePassword = function(password) {
    var user = this;
    return bcrypt.compareSync(password, user.password);
};
 
// return the model
module.exports = mongoose.model('User', UserSchema);

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var morgan = require('morgan');
var mongoose = require('mongoose');
var port = process.env.PORT || 3030;
 
app.use(express.static(__dirname + '/public'));
 
// connect to our database (hosted on modulus.io)
mongoose.connect('mongodb://localhost:27017/databaseName');
 
var User = require('./server/models/user');
 
// bodyParser middleware
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
 
// logging
app.use(morgan('dev'));
 
// get an instance of the express router
var apiRouter = express.Router();
 
 
// middleware to use for all requests
apiRouter.use(function(req, res, next) {
    console.log('Somebody just came to our app!');
    next();
});
 
apiRouter.get('/', function(req, res) {
    res.json({ message: 'API Home' });
});
 
// API for users
apiRouter.route('/users')
 
    // POST of user
    .post(function (req, res) {
        // create a new instance of the User model
        var user = new User();
 
        // set the users information (comes from the request)
        user.name = req.body.name;
        user.username = req.body.username;
        user.password = req.body.password;
 
        // save the user and check for errors
        user.save(function (err) {
            if (err) {
                // duplicate entry
                if (err.code === 11000) {
                    return res.json({success: false, message: 'A user with that username already exists.'});
                } else {
                    return res.send(err);
                }
            }
            res.json({message: 'User created.'});
        });
    })
 
    // GET of users
    .get(function (req, res) {
        User.find(function (err, users) {
            if (err) {
                res.send(err);
            }
            res.json(users);
        });
    });
 
apiRouter.route('/users/:user_id')
 
    // GET user with id
    .get(function (req, res) {
        User.findById(req.params.user_id, function (err, user) {
            if (err) {
                res.send(err);
            }
            res.json(user);
        });
    })
 
    // update user with id
    .put(function (req, res) {
        User.findById(req.params.user_id, function (err, user) {
            if (err) {
                res.send(err);
            }
 
            // update the users info only if its new
            if (req.body.name) user.name = req.body.name;
            if (req.body.username) user.username = req.body.username;
            if (req.body.password) user.password = req.body.password;
 
            user.save(function (err) {
                if (err) {
                    res.send(err);
                }
                res.json({ message: 'User updated.'});
            });
        });
    })
 
    // delete user with id
    .delete(function (req, res) {
        User.remove({ _id: req.params.user_id }, function (err, user) {
            if (err) {
                res.send(err);
            }
            res.json({ message: 'Successfully deleted.'});
        });
    });
 
// register routes
app.use('/api', apiRouter);
 
// START THE SERVER
// ===============================
app.listen(port);
console.log('Listening on port ' + port + '...');