Add loading guard to stop duplicate API calls
One missing loading check can create duplicate records, double payments, or repeated requests.
A very common real-world issue:
User clicks button twice.
API fires twice.
Now you have duplicate inserts, duplicate emails, or duplicate submissions.
Quick frontend fix:
if (loading) return;
setLoading(true);
try {
await submitData();
} finally {
setLoading(false);
}Also disable the button:
<button disabled={loading}>
{loading ? "Submitting..." : "Submit"}
</button>This is small, but in real apps it prevents messy data problems.
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