Google Search for Developers
Make your websites crawlable and indexable. Technical SEO fundamentals for engineers.
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="..." />
<!-- Missing canonical -->
</head>
<body>...</body>
</html>
HTTP Status Codes
How Googlebot interprets server responses.
200 OKSuccess
301/302Redirect
404Not Found
500Server Error
Javascript Rendering
Googlebot can execute JS, but Server-Side Rendering (SSR) or Static Generation (SSG) is safer and faster.
Hydration Mismatch? Googlebot sees the initial HTML. If content only appears after JS execution (Client-Side Rendering), it might be delayed in indexing.