I just came across a case where I needed to turn some form data into an array of key value pairs, where the key is the input name.
<!DOCTYPE html>
<html>
<body>
<form>
<label for="first">First name</label>
<input type="text" name="first"/>
<label for="last">Last name</label>
<input type="text" name="last"/>
<label for="age">Age</label>
<input type="number" name="age"/>
<button type="button" id="btn">Click</button>
</form>
<script>
document.querySelector("#btn").addEventListener('click', () => {
const inputs = new FormData(document.querySelector("form"));
const entries = Object.fromEntries(inputs);
const options = Object.entries(entries).map(([key, value]) => ({ key, value }));
console.log(options);
/**
[
{
"key": "first",
"value": ""
},
{
"key": "last",
"value": ""
},
{
"key": "age",
"value": ""
}
]
*/
})
</script>
</body>
</html>
Note: this won't work for multi-select
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