How Can I Efficiently Inspect the Keys and Values Within a FormData Object?

Introspecting FormData: Exploring Keys

Understanding the contents of FormData objects is essential for debugging and examining form submissions. However, console.log and loop-based approaches may not provide the desired results.

FormData.entries()

Since March 2016, recent versions of Chrome and Firefox support using FormData.entries() for inspection. This method iterates over key-value pairs within the FormData object.

// Create a test FormData object
var formData = new FormData();
formData.append('key1', 'value1');
formData.append('key2', 'value2');

// Display the key/value pairs
for (var pair of formData.entries()) {
    console.log(pair[0]+ ', ' + pair[1]); 
}

Alternative Approaches

Prior to the introduction of FormData.entries(), the inability to retrieve data directly from FormData objects necessitated alternative methods. One option involved converting a regular dictionary to FormData:

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

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

For debugging, sending the FormData object via an XMLHttpRequest also allowed for examination in the network request console:

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

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