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How to Convert HTML5 FormData to JSON for Client-Server Communication?
How to Convert HTML5 FormData to JSON for Client-Server Communication?
Oct 26, 2024 pm 06:33 PM
Converting HTML5 FormData to JSON
Converting HTML5 FormData objects to JSON allows for the serialization of form data into a machine-readable format. This is useful for transmitting data between the client and server.
Method Using a Custom Object and JSON.stringify
To convert FormData entries to JSON without jQuery or serializing the entire object:
<code class="javascript">var object = {};
formData.forEach(function(value, key){
object[key] = value;
});
var json = JSON.stringify(object);</code>
Update 1: ES6 Arrow Functions
Using ES6 arrow functions:
<code class="javascript">var object = {};
formData.forEach((value, key) => object[key] = value);
var json = JSON.stringify(object);</code>
Update 2: Support for Multi-Value Elements
For multi-select lists or other form elements with multiple values:
<code class="javascript">var object = {};
formData.forEach((value, key) => {
if(!Reflect.has(object, key)){
object[key] = value;
return;
}
if(!Array.isArray(object[key])){
object[key] = [object[key]];
}
object[key].push(value);
});
var json = JSON.stringify(object);</code>
Update 3: Direct Transmission of FormData
For sending FormData to a server via XMLHttpRequest:
<code class="javascript">var request = new XMLHttpRequest();
request.open('POST', 'http://example.com/submitform.php');
request.send(formData);</code>
Or using the Fetch API:
<code class="javascript">fetch('http://example.com/submitform.php', {
method: 'POST',
body: formData
}).then((response) => {
// do something with response here...
});</code>
Update 4: Custom toJSON Method for Complex Objects
For custom objects, define a toJSON method to serialize their content. Refer to the MDN documentation for more information on JSON.stringify limitations.
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