How Can I Effectively Debug and Inspect the Contents of a FormData Object?

Debugging FormData: Unveiling the Internal Structure

When dealing with FormData objects, inspecting their contents can be a challenge. Console logging and looping through object keys using for in prove ineffective. However, recent advancements in browser support have opened new avenues for examining FormData.

Updated Solution: Leveraging FormData.entries()

As of March 2016, Chrome and Firefox introduced the FormData.entries() method, which allows for straightforward iteration:

const formData = new FormData();
formData.append('key1', 'value1');
formData.append('key2', 'value2');

for (const [key, value] of formData.entries()) {
    console.log(key, value);
}

Older Approach: Utilizing a Dictionary

In the absence of FormData.entries(), an alternative approach involves creating a regular dictionary and converting it to FormData:

const myFormData = {
    key1: 300,
    key2: 'hello world'
};

const fd = new FormData();
for (const key in myFormData) {
    fd.append(key, myFormData[key]);
}

Debugging with Network Request

To debug a plain FormData object, consider sending it via an AJAX request:

const xhr = new XMLHttpRequest;
xhr.open('POST', '/', true);
xhr.send(fd);

By examining the network request in the browser's console, you can gain insights into the FormData's contents.

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