What steps can I take to prevent receiving a 400 (Bad Request) error when using ajax PUT

Having an issue with sending data using JavaScript and AJAX. The objective is to send the data via PUT method to the server.

var payload = 'id=' + id + '&brand=' + brand + '&model=' + model + '&country=' + country + '&number=' + number + '&alkohol=' + alkohol + '&volume=' + volume + '&price=' + price + '&comment=' + comment;

var fixedPayload = payload.split(' ').join('+'); // replacing spaces with +

$.ajax({
        type: 'PUT',
        url: 'http://localhost:3000/drinks/' + fixedPayload,
        success: function (data) {
            alert('Update was successful!');
        }
    });

Server-side code

app.put('drinks/:id', (req, res) => {

    let id = req.params.id;
    var data = {
        brand: req.body.brand,
        model: req.body.model,
        country: req.body.country,
        number: req.body.number,
        alkohol: req.body.alkohol,
        volume: req.body.volume,
        price: req.body.price,
        comment: req.body.comment
    };
    
    Drink.findByIdAndUpdate(id, data, function(err, drink) {
        if (err) throw err;

        res.send('Drink updated - '+drink.model);
        });
});

Resulting error message

jquery-3.3.1.min.js:2 PUT http://localhost:3000/drinks/?... 404 (Not Found)

Logged fixedPayload value

?5c1b873a6a0a5d3ae0342f01&brand=Läsk&model=Cola&country=Sverige&number=999&alkohol=0%&volume=33+cl&price=20&comment=Cola+asd

What could be causing this issue? Tried sending Object instead of String but same result.

Solution

Adjusted AJAX request

package = {
    brand: brand,
    model: model,
    country: country,
    number: number,
    alkohol: alkohol,
    volume: volume,
    price: price,
    comment: comment        
};

$.ajax({
    type: 'PUT',
    url: `http://localhost:3000/drinks/${id}`, 
    data: package,
    success: function (data) {
        alert('Update was successful!');
        window.location = "http://localhost:3000/";
    }
});

Answer №1

It appears that your URL is incorrectly formatted. I suggest moving the id from the URL parameters to the path instead. In this scenario, your URL should look like this: http://example.com/products/abc123...

Answer №2

These are the issues present in your code :

  • The endpoint drinks/:id requires a path variable, id, which is missing as you are concatenating it with a query string on the client side:
    'http://localhost:3000/drinks/' + fixedPayload
  • You are sending parameters as a query string whereas the server expects them to be in the request body. Example: brand: req.body.brand

A corrected approach should look like this:

var payload = '?brand=' + brand + '&model=' + model + '&country=' + country + '&number=' + number + '&alkohol=' + alkohol + '&volume=' + volume + '&price=' + price + '&comment=' + comment;

var fixedPayload = payload.split(' ').join('+'); // replacing spaces with +

$.ajax({
        type: 'PUT',
        url: 'http://localhost:3000/drinks/' + id,
        data: fixedPayload,
        // data: fixedPayload, this does not work either
        success: function (data) {
            alert('Update successful!');
        }
    });

Answer №3

Dealing with HTTP requests can be challenging, especially when it comes to encoding special characters like %. If your code isn't handling this properly, it could be the cause of a 400 error. jQuery excels at managing these requests for you, so consider using it to handle creating the request string by passing an object instead of a string.

var payload = {
    id: id,
    brand: brand,
    model: model,
    country: country,
    number: number,
    alkohol: alkohol,
    volume: volume,
    price: price,
    comment: comment
};

$.ajax({
    type: 'PUT',
    url: 'http://localhost:3000/drinks/',
    data: payload,
    success: function (data) {
        alert('Update was successful!');
    }
});

Additionally, your server-side code is expecting a request in the format drinks/:id, so you may want to adjust your AJAX settings object to include something like

    url: 'http://localhost:3000/drinks/' + id,

to ensure proper communication with the server.

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