Validation, Canonicalization, Escaping & Sanitization
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{
"firstName": "joHn",
"lastName": " DoE",
"url": "myWebsite.com"
}{
"firstName": "john",
"lastName": "doe",
"url": "https://mywebsite.com"
}<img src="not-found" onerror=alert(1)><img src="not-found">