Learn standard HTTP status codes:
⊞Code Example
app.get('/api/search', (req, res) => {
const { query, limit = 10 } = req.query; // Query string ?query=html&limit=5
if (!query) {
return res.status(400).json({ error: "Query parameter is required" });
}
res.status(200).json({ query, results: [] });
});