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node.js backend

2024-09-29 20:11:39   211人阅读

create a new directory “mytasklist”

 

set up node.js server

 

npm init (entry point =>server.js)

open package.json

npm install express body-parser ejs mongojs --save

 

create server.js file (backend server file)

//run the server with nodemon

var express = require(‘express‘);
var path = require(‘path‘);
var bodyParser = require(‘body-parser‘);

var index = require(‘./routes/index‘); //for index home page
var tasks = require(‘./routes/tasks‘); //apis work with mongodb

var port = 3000;

var app = express();

//view engine
app.set(‘views‘, path.join(__dirname, ‘views‘));
app.set(‘view engine‘, ‘ejs‘);
app.engine(‘html‘, require(‘ejs‘).renderFile);

//set static folder, for all angular file
app.use(express.static(path.join(__dirname, ‘client‘)));

//body parser middle ware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.use(‘/‘, index);
app.use(‘/api‘, tasks);

app.listen(port, function(){
    console.log(‘server started on port ‘+port);
});

 

create ./routes/index.js

var express = require(‘express‘);
var router = express.Router();

router.get(‘/‘, function(req, res, next){
    res.render(‘index.html‘);
});

module.exports = router;

 

create ./routes/tasks.js

var express = require(‘express‘);
var router = express.Router();

router.get(‘/tasks‘, function(req, res, next){
    res.send("TASK API");
});

module.exports = router;

create ./views/index.html

<!DOCTYPE html>
<html>
    <head>
        <title>My Task List</title>
    </head>
    <body>
        <h1>HELLO WORLD!</h1>
    </body>
</html>

 npm install -g nodemon 

run "nodemon" in the console to start the server

 

set up mongodb database 

 

login mlab.com

create new -> single-node -> sandbox -> databasename: mytasklist_hardi -> create new mongodb deployment

click on the database -> users -> add database user

click collections tab ->add collection -> name: tasks

click on tasks -> add document

{
  "title":"walk the dog"  ,
  "isDone": false  
}

 

update tasks.js file

 

go to database page on mlab.com and copy the url, replace the dbuser and dbpassword with yours

技术分享

 

 
var express = require(‘express‘);
var router = express.Router();
var mongojs = require(‘mongojs‘);
var db = mongojs(‘mongodb://Hardi:asd123@ds161021.mlab.com:61021/mytasklist_hardi‘, [‘tasks‘]); //copy from mlab.com

//get all tasks
router.get(‘/tasks‘, function(req, res, next){
    db.tasks.find(function(err, tasks){
        if(err){
            res.send(err);
        }
        res.json(tasks);
    });

});

//get single task
router.get(‘/task/:id‘, function(req, res, next){
    db.tasks.findOne({_id: mongojs.ObjectId(req.params.id)},function(err, task){
        if(err){
            res.send(err);
        }
        res.json(task);
    });
});

//save task
router.post(‘/task‘, function(req, res, next){
    var task = req.body;
    if(!task.title || (task.isDone + ‘‘)){
        res.status(400);
        res.json({
            "error": "bad data"
        });
    }else{
        db.tasks.save(task, function(err, task){
            if(err){
                res.send(err);
            }
            res.json(task);
        });
    }
});

//delete task
router.delete(‘/task/:id‘, function(req, res, next){
    db.tasks.remove({_id: mongojs.ObjectId(req.params.id)},function(err, task){
        if(err){
            res.send(err);
        }
        res.json(task);
    });
});

//update task
router.put(‘/task/:id‘, function(req, res, next){
    var task = req.body;
    var updTask = {};

    if(task.isDone){
        updTask.isDone = task.isDone;
    }
    if(task.title){
        updTask.title = task.title;
    }
    if(!updTask){
        res.status(400);
        res.json({
            "error": "bad data"
        })
    }else{
        db.tasks.update({_id: mongojs.ObjectId(req.params.id)}, updTask, {}, function(err, task){
            if(err){
                res.send(err);
            }
            res.json(task);
        });
    }

});

module.exports = router;

 

 

 

参考资料；

  • MEAN App From Scratch - MongoDB, Express, Angular 2 & NodeJS
  • mlab.com mongoDB

node.js backend


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