Tips for transferring client-side data to the server-side in Angular, Node.js, and Express

Seeking a straightforward solution to a seemingly basic question.

I am utilizing Angular's $http method with a GET request for a promise from a specific URL (URL_OF_INTEREST).

My server runs an express script server.js capable of handling GET requests.

server.js

var express    = require('express');        
var app        = express();                 
var bodyParser = require('body-parser');
var stripe     = require("stripe")("CUSTOM_TEST_TOKEN");

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var port = process.env.PORT || 8080;        
var router = express.Router();              

router.get('/', function(req, res, next) {

    var stripeToken = "CUSTOM_PAYMENT_TOKEN";

    var charge = stripe.charges.create({
        amount: 1100, 
        currency: "usd",
        source: stripeToken,
        description: "Example charge"
    }, function(err, charge) {
        if (err && err.type === 'StripeCardError') {
            res.json(err);   
        } else {
            res.json(charge);   
        }
    });
});

app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

    next();
})

app.use('/api', router); 
app.listen(port); 
console.log('Magic happens on port ' + port);

Communicating with the URL_OF_INTEREST using an Angular GET method is done like this:

$http.get('URL_OF_INTEREST')
        .success(
            function(success){
                console.log(success)
            })
        .error(
            function(error){
                console.log(error)
            });

The fields amount, currency, source, and description need to be passed from the Angular client side application. How can this data transfer be accomplished and how can my express application receive this information?

Answer №1

Make sure to include the necessary data in your GET request:

var dataToPass = {
    amount: 3,
    currency: 2,
    source: 3,
    description: 4
};

$http.get('URL_OF_INTEREST', dataToPass) // Remember to pass data as the second parameter
    .success(
        function(successResponse){
            console.log(successResponse)
        })
    .error(
        function(errorResponse){
            console.log(errorResponse)
        });

When handling this on the backend, extract the URL parameters accordingly:

router.get('/', function(req, res, next) {

    var amountRequested = req.query.amount; // Extract the desired amount from the GET request

    var stripeToken = "CUSTOM_PAYMENT_TOKEN";

    var chargeDetails = stripe.charges.create({
        amount: 1100, 
        currency: "usd",
        source: stripeToken,
        description: "Example charge"
    }, function(err, charge) {
        if (err && err.type === 'StripeCardError') {
            res.json(err);   
        } else {
            res.json(charge);   
        }
    });
});

Answer №2

Understanding the HTTP GET method

Client:

$http.get('/user', {params: {name: 'JohnDoe'}})
    .success(
        function(success){
            console.log(success)
        })
    .error(
        function(error){
            console.log(error)
        });

Server:

router.get('/user', function(req, res, next) {
    var username = req.query.name;
    res.json({'status': 200, 'msg': 'successful GET request'});
}

Exploring the HTTP POST method

Client:

$http.post('/user', {data: {name: 'JohnDoe'}})
    .success(
        function(success){
            console.log(success)
        })
    .error(
        function(error){
            console.log(error)
        });

Server:

router.post('/user', function(req, res, next) {
    var username = req.body.data.name;
    res.json({'status': 200, 'msg': 'successful POST request'});
}

Answer №3

Answer vs Good Solution

  • When sending data to the server, it is recommended to use HTTP POST method.

  • The HTTP GET method is typically used for querying data rather than sending it. This means that an HTTP request with the GET method will usually have an empty request body. However, data can still be sent to a server via GET using query strings. In your specific case:

Client

$http.get('url_to_be_hit', { name : 'Mr. X'})
    .success(function(res){ //response })
    .error(function(err){ //failure });

Server

app.get('/url_to_be_hit', function(req,res,next){
   //req.query.name
}); 

Happy Helping!

Answer №4

If you want to pass your parameters in a URL query string, one method is to create a JavaScript object with the values and then use jQuery's $.param function. This function will easily serialize the object into a format suitable for appending to the end of a URL:

var data = {
   id: 456,
   name: 'example'
};

When making an ajax call with AngularJS' $http service, you can include the parameters like this:

$http.get('YOUR_URL_HERE' + '?' + $.param(data))
        .then(function(response) {
            console.log(response.data);
        })
        .catch(function(error) {
            console.error(error);
        });

Alternatively, if you prefer not to rely on jQuery:

$http.get('YOUR_URL_HERE', { params: data })
        .then(function(response) {
            console.log(response.data);
        })
        .catch(function(error) {
            console.error(error);
        });

On the server side, assuming you are using Node.js with Express, you can access the parameters using the req object:

var id = req.query.id;
var name = req.query.name;

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